StackWho
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Tracking 1,486+ technologies across 689,020 companies

Turn tech stack data
into pipeline

Find companies by the technologies they use. Get verified decision maker emails. Export to CSV and start selling.

Try "React", "Shopify", or "fintech in New York"

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689,020 companies
686,888+ verified emails
1,486+ technologies

Used by sales teams, recruiters, and researchers at companies worldwide

Track technologies across the web

React React
Python Python
AWS AWS
Node.js Node.js
Shopify Shopify
WordPress WordPress
Stripe Stripe
Docker Docker
Kubernetes Kubernetes
PostgreSQL PostgreSQL
TypeScript TypeScript
Next.js Next.js
Tailwind CSS Tailwind CSS
MongoDB MongoDB
GraphQL GraphQL
Vercel Vercel
Cloudflare Cloudflare
Salesforce Salesforce
HubSpot HubSpot
Google Analytics Google Analytics
React React
Python Python
AWS AWS
Node.js Node.js
Shopify Shopify
WordPress WordPress
Stripe Stripe
Docker Docker
Kubernetes Kubernetes
PostgreSQL PostgreSQL
TypeScript TypeScript
Next.js Next.js
Tailwind CSS Tailwind CSS
MongoDB MongoDB
GraphQL GraphQL
Vercel Vercel
Cloudflare Cloudflare
Salesforce Salesforce
HubSpot HubSpot
Google Analytics Google Analytics
How it works

From discovery to outreach in minutes

Find companies by technology, discover who makes the decisions, and export everything you need.

1

Search & filter

Find companies by technology stack, industry, location, or size. Filter by specific tools like React, AWS, or Shopify across 689,020+ companies.

2

Find decision makers

See key contacts at every company -- CEO, CTO, VP Engineering, Head of Sales, and more. Get verified email addresses and LinkedIn profiles.

3

Export & connect

Build targeted lists and export company data with contacts to CSV. Import into your CRM, outreach tool, or sales platform and start connecting.

Browse

Explore the directory

Browse companies by the dimension that matters most to you.

By Technology

React, AWS, Python, Shopify, WordPress, and 1,486+ more technologies.

Browse technologies

By Industry

SaaS, fintech, healthcare, e-commerce, media, and dozens of industries.

Browse industries

By Location

Filter by country, state, or city. Find companies anywhere in the world.

Browse locations

By Company Size

From startups to enterprises. Filter by employee count to target the right fit.

Browse by size
Python Python JavaScript JavaScript TypeScript TypeScript Ruby Ruby Go Go Java Java PHP PHP Rust Rust C# C# Swift Swift Kotlin Kotlin Scala Scala Elixir Elixir Dart R Haskell Haskell
Python Python JavaScript JavaScript TypeScript TypeScript Ruby Ruby Go Go Java Java PHP PHP Rust Rust C# C# Swift Swift Kotlin Kotlin Scala Scala Elixir Elixir Dart R Haskell Haskell
Python Python JavaScript JavaScript TypeScript TypeScript Ruby Ruby Go Go Java Java PHP PHP Rust Rust C# C# Swift Swift Kotlin Kotlin Scala Scala Elixir Elixir Dart R Haskell Haskell
React React Vue.js Vue.js Angular Angular Next.js Next.js Svelte Svelte Tailwind CSS Tailwind CSS Nuxt.js Nuxt.js Gatsby Gatsby Remix Remix Astro Astro Bootstrap Bootstrap jQuery jQuery Ember.js Ember.js Alpine.js Alpine.js Solid.js Solid.js Lit Lit
React React Vue.js Vue.js Angular Angular Next.js Next.js Svelte Svelte Tailwind CSS Tailwind CSS Nuxt.js Nuxt.js Gatsby Gatsby Remix Remix Astro Astro Bootstrap Bootstrap jQuery jQuery Ember.js Ember.js Alpine.js Alpine.js Solid.js Solid.js Lit Lit
React React Vue.js Vue.js Angular Angular Next.js Next.js Svelte Svelte Tailwind CSS Tailwind CSS Nuxt.js Nuxt.js Gatsby Gatsby Remix Remix Astro Astro Bootstrap Bootstrap jQuery jQuery Ember.js Ember.js Alpine.js Alpine.js Solid.js Solid.js Lit Lit
Node.js Node.js Django Django Laravel Laravel Rails Rails Spring Spring Express Express FastAPI FastAPI Flask Flask ASP.NET ASP.NET NestJS NestJS Phoenix Phoenix Gin Fiber Actix
Node.js Node.js Django Django Laravel Laravel Rails Rails Spring Spring Express Express FastAPI FastAPI Flask Flask ASP.NET ASP.NET NestJS NestJS Phoenix Phoenix Gin Fiber Actix
Node.js Node.js Django Django Laravel Laravel Rails Rails Spring Spring Express Express FastAPI FastAPI Flask Flask ASP.NET ASP.NET NestJS NestJS Phoenix Phoenix Gin Fiber Actix
AWS AWS Google Cloud Google Cloud Azure Azure Vercel Vercel Netlify Netlify Cloudflare Cloudflare Heroku Heroku DigitalOcean DigitalOcean Fly.io Fly.io Railway Railway Render Render Supabase Supabase PlanetScale PlanetScale Neon
AWS AWS Google Cloud Google Cloud Azure Azure Vercel Vercel Netlify Netlify Cloudflare Cloudflare Heroku Heroku DigitalOcean DigitalOcean Fly.io Fly.io Railway Railway Render Render Supabase Supabase PlanetScale PlanetScale Neon
AWS AWS Google Cloud Google Cloud Azure Azure Vercel Vercel Netlify Netlify Cloudflare Cloudflare Heroku Heroku DigitalOcean DigitalOcean Fly.io Fly.io Railway Railway Render Render Supabase Supabase PlanetScale PlanetScale Neon
PostgreSQL PostgreSQL MongoDB MongoDB MySQL MySQL Redis Redis Elasticsearch Elasticsearch Firebase Firebase DynamoDB DynamoDB ClickHouse Neo4j Neo4j Snowflake Snowflake Pinecone CockroachDB CockroachDB Cassandra Cassandra
PostgreSQL PostgreSQL MongoDB MongoDB MySQL MySQL Redis Redis Elasticsearch Elasticsearch Firebase Firebase DynamoDB DynamoDB ClickHouse Neo4j Neo4j Snowflake Snowflake Pinecone CockroachDB CockroachDB Cassandra Cassandra
PostgreSQL PostgreSQL MongoDB MongoDB MySQL MySQL Redis Redis Elasticsearch Elasticsearch Firebase Firebase DynamoDB DynamoDB ClickHouse Neo4j Neo4j Snowflake Snowflake Pinecone CockroachDB CockroachDB Cassandra Cassandra
Docker Docker Kubernetes Kubernetes Terraform Terraform GitHub Actions GitHub Actions Jenkins Jenkins Ansible Ansible CircleCI CircleCI Datadog Datadog Grafana Grafana Sentry Sentry Prometheus Prometheus New Relic New Relic PagerDuty PagerDuty
Docker Docker Kubernetes Kubernetes Terraform Terraform GitHub Actions GitHub Actions Jenkins Jenkins Ansible Ansible CircleCI CircleCI Datadog Datadog Grafana Grafana Sentry Sentry Prometheus Prometheus New Relic New Relic PagerDuty PagerDuty
Docker Docker Kubernetes Kubernetes Terraform Terraform GitHub Actions GitHub Actions Jenkins Jenkins Ansible Ansible CircleCI CircleCI Datadog Datadog Grafana Grafana Sentry Sentry Prometheus Prometheus New Relic New Relic PagerDuty PagerDuty
Stripe Stripe PayPal PayPal Shopify Shopify Square Square Braintree Braintree Adyen Adyen Paddle Chargebee Chargebee OpenAI OpenAI TensorFlow TensorFlow PyTorch PyTorch Hugging Face Hugging Face LangChain LangChain Anthropic
Stripe Stripe PayPal PayPal Shopify Shopify Square Square Braintree Braintree Adyen Adyen Paddle Chargebee Chargebee OpenAI OpenAI TensorFlow TensorFlow PyTorch PyTorch Hugging Face Hugging Face LangChain LangChain Anthropic
Stripe Stripe PayPal PayPal Shopify Shopify Square Square Braintree Braintree Adyen Adyen Paddle Chargebee Chargebee OpenAI OpenAI TensorFlow TensorFlow PyTorch PyTorch Hugging Face Hugging Face LangChain LangChain Anthropic
Google Analytics Google Analytics Mixpanel Mixpanel Segment Segment HubSpot HubSpot Amplitude Amplitude Heap Heap PostHog PostHog Hotjar Hotjar Intercom Intercom WordPress WordPress Contentful Contentful Sanity Sanity Strapi Strapi Webflow Webflow
Google Analytics Google Analytics Mixpanel Mixpanel Segment Segment HubSpot HubSpot Amplitude Amplitude Heap Heap PostHog PostHog Hotjar Hotjar Intercom Intercom WordPress WordPress Contentful Contentful Sanity Sanity Strapi Strapi Webflow Webflow
Google Analytics Google Analytics Mixpanel Mixpanel Segment Segment HubSpot HubSpot Amplitude Amplitude Heap Heap PostHog PostHog Hotjar Hotjar Intercom Intercom WordPress WordPress Contentful Contentful Sanity Sanity Strapi Strapi Webflow Webflow
Find people

Find the decision makers

Named engineering leaders — CTOs, VPs of Engineering, and more — at the companies that matter to you.

Find CTOs
Find VPs of Engineering
Find Heads of Engineering
Find Directors of Engineering
Find CIOs

Top CTOs by city

London New York San Francisco Paris Sao Paulo Stockholm Toronto Berlin Singapore Los Angeles Sydney Madrid
Features

Everything you need for prospecting

Technographic data, decision maker contacts, and powerful export tools -- all in one platform.

Full tech stack profiles

See every technology a company uses -- from frontend frameworks and analytics to hosting, payment processors, and marketing tools.

Decision maker contacts

Find the CEO, CTO, VP Engineering, Head of Sales, and other key decision makers. Get verified emails and LinkedIn profiles.

CSV export

Export company data and contacts to CSV. Import into HubSpot, Salesforce, Outreach, Apollo, or any CRM and start prospecting.

Saved lists

Save companies to custom lists for different campaigns. Organize your prospects by technology, industry, or any criteria you need.

Advanced search

Combine filters across technology, industry, location, and company size. Find exactly the right prospects from 689,020+ companies.

Global coverage

Companies across every country, from Silicon Valley startups to London enterprises. Filter by city, state, or country to target your market.

Featured companies

See what's inside

Some of the hottest AI and tech companies in our directory. Every profile includes tech stack, contacts, and company data.

OpenAI
research
San Francisco, California
CloudFlare CDN Gmail Outlook Marketo Google Apps Microsoft Office 365 +8 more
26 contacts 5001-10000 employees
Anthropic
research
San Francisco, California
Cloudflare DNS Gmail Google Apps Microsoft Office 365 Amazon AWS Atlassian Cloud +23 more
17 contacts 1001-5000 employees
Stripe
information technology & services
San Francisco, California
Route 53 Gmail Google Apps Microsoft Office 365 Amazon AWS Mixpanel +3 more
197 contacts 5001-10000 employees
Figma
design
San Francisco, California
Route 53 Gmail Marketo Google Apps Microsoft Office 365 Greenhouse.io +18 more
54 contacts 1001-5000 employees
Datadog
information technology & services
New York, New York
Route 53 Amazon SES Rackspace MailGun Gmail Marketo Google Apps +20 more
272 contacts 5001-10000 employees
Vercel
information technology & services
San Francisco, California
Salesforce Amazon SES Sendgrid Gmail Marketo Google Apps +35 more
31 contacts 501-1000 employees
Browse all 689,020+ companies
Built for

Who uses StackWho

Whether you're selling software, recruiting engineers, or researching competitors -- StackWho gives you the data you need.

Sales teams

Find companies using your competitor's product. Reach the CTO or VP Engineering with a targeted pitch based on their tech stack. Export to CRM.

See how

Recruiters

Win clients by targeting companies using specific stacks. Contact the VP Engineering or CTO directly. Export leads to CSV and build your pipeline.

See how

Competitive intelligence

Track what technologies competitors use. Monitor adoption trends across your market and spot opportunities before they become obvious.

See how

Investors

Conduct tech due diligence before investing. Benchmark portfolio companies against competitors and find acquisition targets by technology.

See how

Market research

Analyze technology adoption across industries and company sizes. Export data to CSV for reports, presentations, and strategic planning.

See how

Partnerships

Find companies with complementary tech stacks for integrations, co-marketing, and channel partnerships. Reach the right decision maker.

See how

The numbers speak

The most comprehensive company tech stack database with decision maker contacts.

689k+
Companies
1k+
Technologies
687k+
Contact Emails
Weekly
Data Updates
Compare

Why teams choose StackWho

Feature StackWho BuiltWith Wappalyzer
Tech stack data
Decision maker contacts
Verified emails
CSV export Unlimited Limited Limited
Saved lists
Annual contract required No Yes No
Starting price $79/mo $295/mo $250/mo
FAQ

Frequently asked questions

What data do you provide for each company?
Each company profile includes the full technology stack (frameworks, analytics, hosting, payment processors, marketing tools, and more), key contacts (CEO, CTO, VP Engineering, Head of Sales, etc.) with verified email addresses and LinkedIn profiles, plus company metadata like industry, location, employee count, founded year, and website.
How do you detect what technologies a company uses?
We analyze company websites, job postings, public repositories, and other public data sources to identify the technologies in use. Our data is updated weekly to reflect technology changes and new adoptions.
How are contact emails verified?
We use multiple verification methods including SMTP validation, domain verification, and cross-referencing with public professional profiles. Our database is updated regularly to remove bounced addresses and add newly verified contacts.
What types of contacts are available?
We focus on decision makers: CEOs, CTOs, VP Engineering, Head of Sales, Chief Revenue Officers, founders, and other C-level and VP-level executives. Each contact includes their title, verified email address, and LinkedIn profile when available.
Can I cancel my subscription anytime?
Yes. Both monthly and annual plans can be cancelled anytime from your dashboard. No annual contracts, no cancellation fees. You retain access until the end of your billing period.
Is there a free plan?
Yes. Free users can browse the full directory, view company tech stacks, industries, locations, and sizes. Contact details (email addresses, LinkedIn profiles) are partially masked on the free plan. Upgrade to unlock full contacts, CSV exports, and saved lists.
How is StackWho different from BuiltWith?
BuiltWith and Wappalyzer show you what technologies a company uses -- but that's where they stop. StackWho goes further by also providing verified decision maker contacts (CEO, CTO, VP Engineering, Head of Sales) so you can actually reach out to the people behind the tech stack. Plus, we're significantly more affordable with no annual contracts required.
Get started today

Know their stack.
Reach their team.

Join sales teams, recruiters, and researchers using StackWho to discover tech stacks and connect with decision makers. Start free, upgrade when you're ready.

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