---
title: "Find Companies by Tech Stack"
description: "Pick one or more technologies, a site type, or both, then a country if you want, and get the matching websites: domain, site type, confidence score, main country and detected technologies."
canonical: "https://derrick-app.com/features/find-companies-by-tech-stack"
category: "Feature"
runs_on: "Web app, Google Sheets, MCP (AI agents), REST API"
---

# Find Companies by Tech Stack

> Pick one or more technologies, a site type, or both, then a country if you want, and get the matching websites: domain, site type, confidence score, main country and detected technologies.

*Canonical: https://derrick-app.com/features/find-companies-by-tech-stack*

---

## Where it runs

- **Web app** (https://app.derrick-app.com) - nothing to install: import or build a list, add a column with this action, run it.
- **Google Sheets add-on** - run it from the Derrick sidebar, results written to your sheet.
- **MCP server (AI agents)** - call it from Claude, Cursor, or any MCP client. See /mcp.
- **REST API** - call it from your own code (PLUS plan and up). Docs: https://app.derrick-app.com/api-docs

## How to use it

### Step 1: Pick a stack or a site type
Choose one or more technologies (Shopify, Stripe, HubSpot...), a site type (E-commerce, SaaS, Media, Other), or both. One of the two is enough: every SaaS in France works with no technology at all. Country and size only narrow the list.

### Step 2: Derrick checks each site
It reads each site's homepage live and scores it on its stack and its content, so a site marked SaaS is one whose homepage confirms it, not a guess.

### Step 3: Get a company list
Domain, site type, confidence score, main country and detected technologies land in a new sheet, Companies by tech stack, one company per row.

## Use it from an AI agent (MCP)

Exposed as the `derrick_find_companies_by_tech_stack` tool on the Derrick MCP server (1 credit per result).

**Example prompt**: "Find 25 SaaS companies that use Stripe"

**Result**: 25 SaaS websites on Stripe, each with its type score, country and stack.

Install: `claude mcp add derrick -- npx -y derrick-mcp`. Full catalog at /mcp.md.

## Use it from the REST API

Action: `find_companies_by_tech_stack`. Available from the PLUS plan upward, same credit cost as in the web app and the add-on.

- Docs: https://app.derrick-app.com/api-docs
- Auth: pass your key in the `x-api-key` header (get it at https://app.derrick-app.com/api-mcp, or in the Google Sheets add-on -> menu -> API)
- Machine-readable pricing: /pricing.md

## Build an account list from the tools your prospects use, or from what they sell
Choose a stack, a site type, or both, then a country. Derrick returns the websites that match, ready for you to find the right people and their emails.