Cold Email Tech Stack
•
Every cold email agency claims to have a system. Very few are willing to show you exactly what's inside it.
Outreachify runs 50,000+ emails a day across 20+ workspaces, generating 100+ qualified leads daily for B2B clients across SaaS, fintech, e-commerce, hospitality, legal, and beyond. That output doesn't happen by accident — it's the product of a deliberately assembled stack of 38 tools, each chosen for a specific job, working in sequence.
This is the full breakdown: what we use, why we use it, and how the pieces connect.
Sending Infrastructure
The foundation of any high-volume outbound operation is the infrastructure that actually delivers emails. Get this wrong and nothing else matters.
EmailBison is the sequencer that runs everything. It's a private, deliverability-optimised sequencer built for agencies and GTM teams — not a mass-market tool with compromised sending reputation from thousands of shared users. It handles multi-step sequences, automated follow-ups, reply routing, and inbox management across all workspaces. Critical settings: plain text on, open tracking off, unsubscribe links off, auto-replies on. Every campaign runs at ~75% of the daily send limit to leave headroom for follow-ups.
Inboxing provisions the Microsoft Azure inboxes. At 49 inboxes per domain with automated setup and API access, it's built specifically for high-volume cold email operations where manual mailbox creation would be a full-time job.
Cheap Inboxes handles the Google Workspace side — dirt cheap Google inboxes at $3.50/month with fast setup. The ESP split is 50% Microsoft via Inboxing, 50% Google via Cheap Inboxes. Equal distribution prevents single-point failure if one provider starts flagging sends.
Porkbun is where all sending domains are registered. Letters only, no hyphens or numbers, standard prefixes (get, try, go, the, my, app, hq, online, team). Clean domain setup from the start protects deliverability from day one.
SpaceShip is an alternative to Porkbun for domain registration — next-level domain management with hosting, email, and AI tools built in. When Porkbun doesn't have the specific domain available, SpaceShip is the fallback registrar. Same naming rules apply.
EmailGuard monitors deliverability across the entire sending infrastructure. Domain masking, authentication checks, blacklist monitoring, and inbox placement tracking. At 50k+ daily sends, a deliverability problem that goes unnoticed for 48 hours is an expensive problem. EmailGuard catches it before it compounds.
Email Verification
At high volume, every unverified contact is a liability. Bounce rates above 3% damage sender reputation. The verification pipeline runs every list through two stages before a single email is sent.
MillionVerifier handles the first pass — removing invalid, non-existent, and clearly bad email addresses with 99%+ accuracy. It's the fastest way to clean a raw list before enrichment adds noise back in.
BounceBan handles catch-alls, which is where most operators leave significant TAM on the table. Catch-all domains accept any email sent to them, meaning standard verifiers can't confirm whether a specific address is actually valid. At scale, skipping catch-alls removes up to 25% of any given addressable market. BounceBan uses proprietary algorithms to score catch-all addresses by true deliverability probability — high-confidence catch-alls go through, risky ones get filtered. The result is a larger, cleaner list than any operator running a single-tool verification process.
List Building and Data
You can't send to contacts you don't have. The list-building pipeline starts broad and gets sharper at every stage.
Apollo.io is the primary scraping and prospecting database. Filtering by industry, company size, geography, job title, funding stage, and technology stack, Apollo pulls the raw universe. The key is to scrape broad and qualify downstream rather than over-constraining the search upfront.
Prospeo finds verified email addresses and mobile numbers from LinkedIn and Sales Navigator. Where Apollo covers the company-level and role-level filtering, Prospeo digs into contact-level verification — particularly useful for pulling emails from LinkedIn that Apollo may not surface.
LeadMagic enriches prospecting data with accurate emails, mobile numbers, and company information in real-time. It integrates directly with outbound systems to clean, validate, and push enriched data without manual exports.
Icypeas is a targeted email finder and verifier with a sub-2.5% bounce rate guarantee. Fast, accurate, and built specifically for list building at scale.
DiscoLike finds high-fit target accounts using natural language and lookalike domain matching. When a client wants to replicate the profile of their best customers across a new market, DiscoLike identifies the lookalike universe without manual research.
BuiltWith surfaces technology stack data on any domain — which ESP they use, what CRM they're on, whether they're running a specific platform. At Outreachify this feeds into ICP segmentation for clients where tech stack is a qualifying signal.
Crunchbase provides funding data, growth signals, and private market intelligence. For campaigns targeting funded companies at specific stages, Crunchbase is the source of record.
Adyntel shows which companies are running ads across Google, Meta, and LinkedIn, along with estimated marketing budgets. A company actively spending on paid acquisition is a company with budget — a useful qualification signal for the right verticals.
Trigify tracks social media signals — competitor engagement, brand mentions, LinkedIn profile engagers, and intent signals from conversations happening in the market. For campaigns built around buying intent rather than firmographics, Trigify surfaces who's in-market right now.
SerpApi powers custom search scraping — real-time Google search results with CAPTCHA solving, used for building targeted lists from search-based signals and research workflows.
Apify is the broader web scraping infrastructure. Where SerpApi handles Google specifically, Apify handles everything else — custom actors for scraping any web source, deployed at scale with no infrastructure management overhead.
Enrichment and Qualification
Clay is where raw contacts become campaign-ready leads. It connects to 100+ data sources — Apollo, LinkedIn, BuiltWith, Crunchbase, Clearbit, and others — and runs qualification logic, enrichment workflows, and data formatting across every contact at scale. At Outreachify, Clay runs a large library of primary templates covering contact qualification, ICP scoring, industry-specific enrichment, and custom research workflows. It's the engine that transforms a raw Apollo export into a structured, segmented, campaign-ready list.
Automation and AI
High-volume outbound generates more events, data, and decisions per day than any human team can handle manually. Automation is not optional — it's structural.
Claude Code is the automation layer that builds the custom infrastructure connecting the entire stack. Reply scoring workflows, AI-powered classification of inbound responses, Slack notification routing, LinkedIn connection trigger logic, and the dozens of custom scripts that run Outreachify's operations continuously. Claude Code writes, debugs, and ships the code that makes the machine run autonomously.
Claude handles research, copywriting drafts, campaign analysis, ICP documentation, and the ongoing analytical work that keeps strategy sharp. At 50k emails a day across multiple clients and verticals, the volume of thinking required is enormous — Claude compresses it.
n8n handles workflow automation at the integration layer — connecting tools, triggering sequences based on events, and running the automation logic that sits between tools. Where Claude Code builds custom infrastructure, n8n orchestrates the standard workflow triggers.
Perplexity is used for real-time research and market intelligence. Deep vertical research, competitor analysis, and the kind of up-to-date information that informs campaign strategy and copy angles.
CRM and Sales Operations
Generating leads at high volume only creates value if the sales process can convert them. The CRM stack handles everything from first reply to closed deal.
HubSpot serves as the primary CRM for tracking contacts, managing pipeline, and connecting marketing and sales data. At Outreachify it functions as the central record system for client-facing pipeline.
Close is the outbound-native CRM — built specifically for sales teams who live in email and phone. Where HubSpot handles the broader pipeline, Close is where SDRs manage active conversations and move deals forward fast.
Attio is the AI-native CRM layer — connecting data across sources, automating workflows, and providing the flexible, programmable structure that standard CRMs can't offer.
Scheduling and Communication
Cal.com handles all meeting scheduling. Customisable booking links, calendar integrations, availability management, and workflow automation around bookings. When an interested prospect replies, the calendar link goes out within 15 minutes.
Slack is the internal operations hub — notifications from every tool in the stack flow here, SDR alerts for hot replies, client updates, campaign performance pings, and team coordination across time zones.
Gather provides the virtual workspace layer for the team — meetings, async collaboration, and the kind of spatial presence that makes remote operations feel coherent.
Proposals, Contracts, and Payments
Gamma builds proposals and presentations fast. AI-generated decks that look polished without the Figma overhead — used for client pitches, strategy decks, and campaign reporting.
eSignature handles contract execution — mobile-friendly, legally binding, with API integration and bulk sending capability. Fast turnaround from verbal agreement to signed contract.
Stripe handles all payment processing — invoices, subscriptions, and revenue operations. The financial backend that keeps the agency running.
Content, Video, and Website
Tella records and edits screen and webcam videos for client communications, onboarding, campaign walkthroughs, and the VSL-style content that gets sent to booked prospects as part of the pre-call workflow.
tl;dv records, transcribes, and summarises discovery calls and internal meetings. Every discovery call produces a transcript that feeds into client strategy documents and post-call follow-ups.
Framer is the website builder — the Outreachify site is built and maintained in Framer, with fast iteration, no-code component control, and the design quality that a credible outbound agency needs.
Lovable enables fast app and tool prototyping — when Outreachify needs a custom internal tool or client-facing product (like a TAM calculator) built quickly, Lovable accelerates the build.
Typeform handles qualification forms — embedded in Calendly booking flows to pre-qualify discovery call applicants before they ever get on the calendar.
Airtable manages structured data that doesn't fit neatly into a CRM — campaign tracking, client onboarding checklists, operational databases, and the kind of flexible data management that spreadsheets can't scale.
How It All Connects
The stack isn't a collection of independent tools — it's a pipeline with a defined flow:
Research and targeting: Crunchbase, BuiltWith, Adyntel, Trigify, SerpApi, Apify, DiscoLike surface market intelligence and build the initial universe.
List building: Apollo, Prospeo, LeadMagic, Icypeas pull contact-level data across that universe.
Enrichment and qualification: Clay runs the qualification logic, enriches every contact, and outputs structured campaign-ready lists.
Verification: MillionVerifier cleans the list. BounceBan scores and includes catch-alls. Only verified contacts proceed.
Sending: Porkbun domains, Inboxing and Cheap Inboxes provision the inbox infrastructure. EmailBison runs the campaigns. EmailGuard monitors deliverability.
Automation: Claude Code builds the custom infrastructure. n8n runs the workflow triggers. Claude handles analysis and copy.
Sales: Hot replies get a calendar link within 15 minutes via Cal.com or a direct call. HubSpot, Close, and Attio manage the pipeline. Gamma and eSignature close the loop from proposal to signed contract.
Infrastructure: Slack, Gather, tl;dv, and Airtable keep the team and operations running.
At Outreachify, the stack is not fixed — it evolves as tools improve, new options emerge, and the operation scales. What doesn't change is the principle: every tool earns its place by doing a specific job better than any alternative, and every job in the pipeline has a tool assigned to it.
The full stack is publicly listed on ColdIQ: coldiq.com/tech-stacks/people/harshbir-s
If you want to see what this infrastructure can do for your pipeline, start by calculating your TAM: outreachify.io/tam
Cold Email Tech Stack
•
Every cold email agency claims to have a system. Very few are willing to show you exactly what's inside it.
Outreachify runs 50,000+ emails a day across 20+ workspaces, generating 100+ qualified leads daily for B2B clients across SaaS, fintech, e-commerce, hospitality, legal, and beyond. That output doesn't happen by accident — it's the product of a deliberately assembled stack of 38 tools, each chosen for a specific job, working in sequence.
This is the full breakdown: what we use, why we use it, and how the pieces connect.
Sending Infrastructure
The foundation of any high-volume outbound operation is the infrastructure that actually delivers emails. Get this wrong and nothing else matters.
EmailBison is the sequencer that runs everything. It's a private, deliverability-optimised sequencer built for agencies and GTM teams — not a mass-market tool with compromised sending reputation from thousands of shared users. It handles multi-step sequences, automated follow-ups, reply routing, and inbox management across all workspaces. Critical settings: plain text on, open tracking off, unsubscribe links off, auto-replies on. Every campaign runs at ~75% of the daily send limit to leave headroom for follow-ups.
Inboxing provisions the Microsoft Azure inboxes. At 49 inboxes per domain with automated setup and API access, it's built specifically for high-volume cold email operations where manual mailbox creation would be a full-time job.
Cheap Inboxes handles the Google Workspace side — dirt cheap Google inboxes at $3.50/month with fast setup. The ESP split is 50% Microsoft via Inboxing, 50% Google via Cheap Inboxes. Equal distribution prevents single-point failure if one provider starts flagging sends.
Porkbun is where all sending domains are registered. Letters only, no hyphens or numbers, standard prefixes (get, try, go, the, my, app, hq, online, team). Clean domain setup from the start protects deliverability from day one.
SpaceShip is an alternative to Porkbun for domain registration — next-level domain management with hosting, email, and AI tools built in. When Porkbun doesn't have the specific domain available, SpaceShip is the fallback registrar. Same naming rules apply.
EmailGuard monitors deliverability across the entire sending infrastructure. Domain masking, authentication checks, blacklist monitoring, and inbox placement tracking. At 50k+ daily sends, a deliverability problem that goes unnoticed for 48 hours is an expensive problem. EmailGuard catches it before it compounds.
Email Verification
At high volume, every unverified contact is a liability. Bounce rates above 3% damage sender reputation. The verification pipeline runs every list through two stages before a single email is sent.
MillionVerifier handles the first pass — removing invalid, non-existent, and clearly bad email addresses with 99%+ accuracy. It's the fastest way to clean a raw list before enrichment adds noise back in.
BounceBan handles catch-alls, which is where most operators leave significant TAM on the table. Catch-all domains accept any email sent to them, meaning standard verifiers can't confirm whether a specific address is actually valid. At scale, skipping catch-alls removes up to 25% of any given addressable market. BounceBan uses proprietary algorithms to score catch-all addresses by true deliverability probability — high-confidence catch-alls go through, risky ones get filtered. The result is a larger, cleaner list than any operator running a single-tool verification process.
List Building and Data
You can't send to contacts you don't have. The list-building pipeline starts broad and gets sharper at every stage.
Apollo.io is the primary scraping and prospecting database. Filtering by industry, company size, geography, job title, funding stage, and technology stack, Apollo pulls the raw universe. The key is to scrape broad and qualify downstream rather than over-constraining the search upfront.
Prospeo finds verified email addresses and mobile numbers from LinkedIn and Sales Navigator. Where Apollo covers the company-level and role-level filtering, Prospeo digs into contact-level verification — particularly useful for pulling emails from LinkedIn that Apollo may not surface.
LeadMagic enriches prospecting data with accurate emails, mobile numbers, and company information in real-time. It integrates directly with outbound systems to clean, validate, and push enriched data without manual exports.
Icypeas is a targeted email finder and verifier with a sub-2.5% bounce rate guarantee. Fast, accurate, and built specifically for list building at scale.
DiscoLike finds high-fit target accounts using natural language and lookalike domain matching. When a client wants to replicate the profile of their best customers across a new market, DiscoLike identifies the lookalike universe without manual research.
BuiltWith surfaces technology stack data on any domain — which ESP they use, what CRM they're on, whether they're running a specific platform. At Outreachify this feeds into ICP segmentation for clients where tech stack is a qualifying signal.
Crunchbase provides funding data, growth signals, and private market intelligence. For campaigns targeting funded companies at specific stages, Crunchbase is the source of record.
Adyntel shows which companies are running ads across Google, Meta, and LinkedIn, along with estimated marketing budgets. A company actively spending on paid acquisition is a company with budget — a useful qualification signal for the right verticals.
Trigify tracks social media signals — competitor engagement, brand mentions, LinkedIn profile engagers, and intent signals from conversations happening in the market. For campaigns built around buying intent rather than firmographics, Trigify surfaces who's in-market right now.
SerpApi powers custom search scraping — real-time Google search results with CAPTCHA solving, used for building targeted lists from search-based signals and research workflows.
Apify is the broader web scraping infrastructure. Where SerpApi handles Google specifically, Apify handles everything else — custom actors for scraping any web source, deployed at scale with no infrastructure management overhead.
Enrichment and Qualification
Clay is where raw contacts become campaign-ready leads. It connects to 100+ data sources — Apollo, LinkedIn, BuiltWith, Crunchbase, Clearbit, and others — and runs qualification logic, enrichment workflows, and data formatting across every contact at scale. At Outreachify, Clay runs a large library of primary templates covering contact qualification, ICP scoring, industry-specific enrichment, and custom research workflows. It's the engine that transforms a raw Apollo export into a structured, segmented, campaign-ready list.
Automation and AI
High-volume outbound generates more events, data, and decisions per day than any human team can handle manually. Automation is not optional — it's structural.
Claude Code is the automation layer that builds the custom infrastructure connecting the entire stack. Reply scoring workflows, AI-powered classification of inbound responses, Slack notification routing, LinkedIn connection trigger logic, and the dozens of custom scripts that run Outreachify's operations continuously. Claude Code writes, debugs, and ships the code that makes the machine run autonomously.
Claude handles research, copywriting drafts, campaign analysis, ICP documentation, and the ongoing analytical work that keeps strategy sharp. At 50k emails a day across multiple clients and verticals, the volume of thinking required is enormous — Claude compresses it.
n8n handles workflow automation at the integration layer — connecting tools, triggering sequences based on events, and running the automation logic that sits between tools. Where Claude Code builds custom infrastructure, n8n orchestrates the standard workflow triggers.
Perplexity is used for real-time research and market intelligence. Deep vertical research, competitor analysis, and the kind of up-to-date information that informs campaign strategy and copy angles.
CRM and Sales Operations
Generating leads at high volume only creates value if the sales process can convert them. The CRM stack handles everything from first reply to closed deal.
HubSpot serves as the primary CRM for tracking contacts, managing pipeline, and connecting marketing and sales data. At Outreachify it functions as the central record system for client-facing pipeline.
Close is the outbound-native CRM — built specifically for sales teams who live in email and phone. Where HubSpot handles the broader pipeline, Close is where SDRs manage active conversations and move deals forward fast.
Attio is the AI-native CRM layer — connecting data across sources, automating workflows, and providing the flexible, programmable structure that standard CRMs can't offer.
Scheduling and Communication
Cal.com handles all meeting scheduling. Customisable booking links, calendar integrations, availability management, and workflow automation around bookings. When an interested prospect replies, the calendar link goes out within 15 minutes.
Slack is the internal operations hub — notifications from every tool in the stack flow here, SDR alerts for hot replies, client updates, campaign performance pings, and team coordination across time zones.
Gather provides the virtual workspace layer for the team — meetings, async collaboration, and the kind of spatial presence that makes remote operations feel coherent.
Proposals, Contracts, and Payments
Gamma builds proposals and presentations fast. AI-generated decks that look polished without the Figma overhead — used for client pitches, strategy decks, and campaign reporting.
eSignature handles contract execution — mobile-friendly, legally binding, with API integration and bulk sending capability. Fast turnaround from verbal agreement to signed contract.
Stripe handles all payment processing — invoices, subscriptions, and revenue operations. The financial backend that keeps the agency running.
Content, Video, and Website
Tella records and edits screen and webcam videos for client communications, onboarding, campaign walkthroughs, and the VSL-style content that gets sent to booked prospects as part of the pre-call workflow.
tl;dv records, transcribes, and summarises discovery calls and internal meetings. Every discovery call produces a transcript that feeds into client strategy documents and post-call follow-ups.
Framer is the website builder — the Outreachify site is built and maintained in Framer, with fast iteration, no-code component control, and the design quality that a credible outbound agency needs.
Lovable enables fast app and tool prototyping — when Outreachify needs a custom internal tool or client-facing product (like a TAM calculator) built quickly, Lovable accelerates the build.
Typeform handles qualification forms — embedded in Calendly booking flows to pre-qualify discovery call applicants before they ever get on the calendar.
Airtable manages structured data that doesn't fit neatly into a CRM — campaign tracking, client onboarding checklists, operational databases, and the kind of flexible data management that spreadsheets can't scale.
How It All Connects
The stack isn't a collection of independent tools — it's a pipeline with a defined flow:
Research and targeting: Crunchbase, BuiltWith, Adyntel, Trigify, SerpApi, Apify, DiscoLike surface market intelligence and build the initial universe.
List building: Apollo, Prospeo, LeadMagic, Icypeas pull contact-level data across that universe.
Enrichment and qualification: Clay runs the qualification logic, enriches every contact, and outputs structured campaign-ready lists.
Verification: MillionVerifier cleans the list. BounceBan scores and includes catch-alls. Only verified contacts proceed.
Sending: Porkbun domains, Inboxing and Cheap Inboxes provision the inbox infrastructure. EmailBison runs the campaigns. EmailGuard monitors deliverability.
Automation: Claude Code builds the custom infrastructure. n8n runs the workflow triggers. Claude handles analysis and copy.
Sales: Hot replies get a calendar link within 15 minutes via Cal.com or a direct call. HubSpot, Close, and Attio manage the pipeline. Gamma and eSignature close the loop from proposal to signed contract.
Infrastructure: Slack, Gather, tl;dv, and Airtable keep the team and operations running.
At Outreachify, the stack is not fixed — it evolves as tools improve, new options emerge, and the operation scales. What doesn't change is the principle: every tool earns its place by doing a specific job better than any alternative, and every job in the pipeline has a tool assigned to it.
The full stack is publicly listed on ColdIQ: coldiq.com/tech-stacks/people/harshbir-s
If you want to see what this infrastructure can do for your pipeline, start by calculating your TAM: outreachify.io/tam
Cold Email Tech Stack
•
Every cold email agency claims to have a system. Very few are willing to show you exactly what's inside it.
Outreachify runs 50,000+ emails a day across 20+ workspaces, generating 100+ qualified leads daily for B2B clients across SaaS, fintech, e-commerce, hospitality, legal, and beyond. That output doesn't happen by accident — it's the product of a deliberately assembled stack of 38 tools, each chosen for a specific job, working in sequence.
This is the full breakdown: what we use, why we use it, and how the pieces connect.
Sending Infrastructure
The foundation of any high-volume outbound operation is the infrastructure that actually delivers emails. Get this wrong and nothing else matters.
EmailBison is the sequencer that runs everything. It's a private, deliverability-optimised sequencer built for agencies and GTM teams — not a mass-market tool with compromised sending reputation from thousands of shared users. It handles multi-step sequences, automated follow-ups, reply routing, and inbox management across all workspaces. Critical settings: plain text on, open tracking off, unsubscribe links off, auto-replies on. Every campaign runs at ~75% of the daily send limit to leave headroom for follow-ups.
Inboxing provisions the Microsoft Azure inboxes. At 49 inboxes per domain with automated setup and API access, it's built specifically for high-volume cold email operations where manual mailbox creation would be a full-time job.
Cheap Inboxes handles the Google Workspace side — dirt cheap Google inboxes at $3.50/month with fast setup. The ESP split is 50% Microsoft via Inboxing, 50% Google via Cheap Inboxes. Equal distribution prevents single-point failure if one provider starts flagging sends.
Porkbun is where all sending domains are registered. Letters only, no hyphens or numbers, standard prefixes (get, try, go, the, my, app, hq, online, team). Clean domain setup from the start protects deliverability from day one.
SpaceShip is an alternative to Porkbun for domain registration — next-level domain management with hosting, email, and AI tools built in. When Porkbun doesn't have the specific domain available, SpaceShip is the fallback registrar. Same naming rules apply.
EmailGuard monitors deliverability across the entire sending infrastructure. Domain masking, authentication checks, blacklist monitoring, and inbox placement tracking. At 50k+ daily sends, a deliverability problem that goes unnoticed for 48 hours is an expensive problem. EmailGuard catches it before it compounds.
Email Verification
At high volume, every unverified contact is a liability. Bounce rates above 3% damage sender reputation. The verification pipeline runs every list through two stages before a single email is sent.
MillionVerifier handles the first pass — removing invalid, non-existent, and clearly bad email addresses with 99%+ accuracy. It's the fastest way to clean a raw list before enrichment adds noise back in.
BounceBan handles catch-alls, which is where most operators leave significant TAM on the table. Catch-all domains accept any email sent to them, meaning standard verifiers can't confirm whether a specific address is actually valid. At scale, skipping catch-alls removes up to 25% of any given addressable market. BounceBan uses proprietary algorithms to score catch-all addresses by true deliverability probability — high-confidence catch-alls go through, risky ones get filtered. The result is a larger, cleaner list than any operator running a single-tool verification process.
List Building and Data
You can't send to contacts you don't have. The list-building pipeline starts broad and gets sharper at every stage.
Apollo.io is the primary scraping and prospecting database. Filtering by industry, company size, geography, job title, funding stage, and technology stack, Apollo pulls the raw universe. The key is to scrape broad and qualify downstream rather than over-constraining the search upfront.
Prospeo finds verified email addresses and mobile numbers from LinkedIn and Sales Navigator. Where Apollo covers the company-level and role-level filtering, Prospeo digs into contact-level verification — particularly useful for pulling emails from LinkedIn that Apollo may not surface.
LeadMagic enriches prospecting data with accurate emails, mobile numbers, and company information in real-time. It integrates directly with outbound systems to clean, validate, and push enriched data without manual exports.
Icypeas is a targeted email finder and verifier with a sub-2.5% bounce rate guarantee. Fast, accurate, and built specifically for list building at scale.
DiscoLike finds high-fit target accounts using natural language and lookalike domain matching. When a client wants to replicate the profile of their best customers across a new market, DiscoLike identifies the lookalike universe without manual research.
BuiltWith surfaces technology stack data on any domain — which ESP they use, what CRM they're on, whether they're running a specific platform. At Outreachify this feeds into ICP segmentation for clients where tech stack is a qualifying signal.
Crunchbase provides funding data, growth signals, and private market intelligence. For campaigns targeting funded companies at specific stages, Crunchbase is the source of record.
Adyntel shows which companies are running ads across Google, Meta, and LinkedIn, along with estimated marketing budgets. A company actively spending on paid acquisition is a company with budget — a useful qualification signal for the right verticals.
Trigify tracks social media signals — competitor engagement, brand mentions, LinkedIn profile engagers, and intent signals from conversations happening in the market. For campaigns built around buying intent rather than firmographics, Trigify surfaces who's in-market right now.
SerpApi powers custom search scraping — real-time Google search results with CAPTCHA solving, used for building targeted lists from search-based signals and research workflows.
Apify is the broader web scraping infrastructure. Where SerpApi handles Google specifically, Apify handles everything else — custom actors for scraping any web source, deployed at scale with no infrastructure management overhead.
Enrichment and Qualification
Clay is where raw contacts become campaign-ready leads. It connects to 100+ data sources — Apollo, LinkedIn, BuiltWith, Crunchbase, Clearbit, and others — and runs qualification logic, enrichment workflows, and data formatting across every contact at scale. At Outreachify, Clay runs a large library of primary templates covering contact qualification, ICP scoring, industry-specific enrichment, and custom research workflows. It's the engine that transforms a raw Apollo export into a structured, segmented, campaign-ready list.
Automation and AI
High-volume outbound generates more events, data, and decisions per day than any human team can handle manually. Automation is not optional — it's structural.
Claude Code is the automation layer that builds the custom infrastructure connecting the entire stack. Reply scoring workflows, AI-powered classification of inbound responses, Slack notification routing, LinkedIn connection trigger logic, and the dozens of custom scripts that run Outreachify's operations continuously. Claude Code writes, debugs, and ships the code that makes the machine run autonomously.
Claude handles research, copywriting drafts, campaign analysis, ICP documentation, and the ongoing analytical work that keeps strategy sharp. At 50k emails a day across multiple clients and verticals, the volume of thinking required is enormous — Claude compresses it.
n8n handles workflow automation at the integration layer — connecting tools, triggering sequences based on events, and running the automation logic that sits between tools. Where Claude Code builds custom infrastructure, n8n orchestrates the standard workflow triggers.
Perplexity is used for real-time research and market intelligence. Deep vertical research, competitor analysis, and the kind of up-to-date information that informs campaign strategy and copy angles.
CRM and Sales Operations
Generating leads at high volume only creates value if the sales process can convert them. The CRM stack handles everything from first reply to closed deal.
HubSpot serves as the primary CRM for tracking contacts, managing pipeline, and connecting marketing and sales data. At Outreachify it functions as the central record system for client-facing pipeline.
Close is the outbound-native CRM — built specifically for sales teams who live in email and phone. Where HubSpot handles the broader pipeline, Close is where SDRs manage active conversations and move deals forward fast.
Attio is the AI-native CRM layer — connecting data across sources, automating workflows, and providing the flexible, programmable structure that standard CRMs can't offer.
Scheduling and Communication
Cal.com handles all meeting scheduling. Customisable booking links, calendar integrations, availability management, and workflow automation around bookings. When an interested prospect replies, the calendar link goes out within 15 minutes.
Slack is the internal operations hub — notifications from every tool in the stack flow here, SDR alerts for hot replies, client updates, campaign performance pings, and team coordination across time zones.
Gather provides the virtual workspace layer for the team — meetings, async collaboration, and the kind of spatial presence that makes remote operations feel coherent.
Proposals, Contracts, and Payments
Gamma builds proposals and presentations fast. AI-generated decks that look polished without the Figma overhead — used for client pitches, strategy decks, and campaign reporting.
eSignature handles contract execution — mobile-friendly, legally binding, with API integration and bulk sending capability. Fast turnaround from verbal agreement to signed contract.
Stripe handles all payment processing — invoices, subscriptions, and revenue operations. The financial backend that keeps the agency running.
Content, Video, and Website
Tella records and edits screen and webcam videos for client communications, onboarding, campaign walkthroughs, and the VSL-style content that gets sent to booked prospects as part of the pre-call workflow.
tl;dv records, transcribes, and summarises discovery calls and internal meetings. Every discovery call produces a transcript that feeds into client strategy documents and post-call follow-ups.
Framer is the website builder — the Outreachify site is built and maintained in Framer, with fast iteration, no-code component control, and the design quality that a credible outbound agency needs.
Lovable enables fast app and tool prototyping — when Outreachify needs a custom internal tool or client-facing product (like a TAM calculator) built quickly, Lovable accelerates the build.
Typeform handles qualification forms — embedded in Calendly booking flows to pre-qualify discovery call applicants before they ever get on the calendar.
Airtable manages structured data that doesn't fit neatly into a CRM — campaign tracking, client onboarding checklists, operational databases, and the kind of flexible data management that spreadsheets can't scale.
How It All Connects
The stack isn't a collection of independent tools — it's a pipeline with a defined flow:
Research and targeting: Crunchbase, BuiltWith, Adyntel, Trigify, SerpApi, Apify, DiscoLike surface market intelligence and build the initial universe.
List building: Apollo, Prospeo, LeadMagic, Icypeas pull contact-level data across that universe.
Enrichment and qualification: Clay runs the qualification logic, enriches every contact, and outputs structured campaign-ready lists.
Verification: MillionVerifier cleans the list. BounceBan scores and includes catch-alls. Only verified contacts proceed.
Sending: Porkbun domains, Inboxing and Cheap Inboxes provision the inbox infrastructure. EmailBison runs the campaigns. EmailGuard monitors deliverability.
Automation: Claude Code builds the custom infrastructure. n8n runs the workflow triggers. Claude handles analysis and copy.
Sales: Hot replies get a calendar link within 15 minutes via Cal.com or a direct call. HubSpot, Close, and Attio manage the pipeline. Gamma and eSignature close the loop from proposal to signed contract.
Infrastructure: Slack, Gather, tl;dv, and Airtable keep the team and operations running.
At Outreachify, the stack is not fixed — it evolves as tools improve, new options emerge, and the operation scales. What doesn't change is the principle: every tool earns its place by doing a specific job better than any alternative, and every job in the pipeline has a tool assigned to it.
The full stack is publicly listed on ColdIQ: coldiq.com/tech-stacks/people/harshbir-s
If you want to see what this infrastructure can do for your pipeline, start by calculating your TAM: outreachify.io/tam