# Companyfacts, free: Tech stack API

> Fetch one web page and report the technologies behind it (CMS, ecommerce platform, analytics, CDN, web server, frameworks, payment processors, email provider) with a confidence and the evidence for each.

Companyfacts's tech stack API on its Free plan. It costs $0.00 per 1,000 companies. It returns 1 of the 13 key fields we check: Categories.
You get up to 300 calls a month.
We haven't run Companyfacts through [our tech stack API benchmark](https://datacircle.dev/best-tech-stack-api.txt) yet.
This plan is free. We rank 310 plans for tech stack APIs by price. Half the plans cost $8.90 per 1,000 companies or less.
[Botoi's $199 monthly plan](https://datacircle.dev/company-technology-apis/botoi/199-monthly/llms.txt) is the cheapest paid plan per 1,000 companies: as little as $0.0066. Botoi's $199 monthly plan covers up to 1,000,000 companies a day.
[GetProspect's $49 monthly plan](https://datacircle.dev/company-technology-apis/getprospect/49-monthly/llms.txt) covers any number of companies. GetProspect's $49 monthly plan costs less up front than Botoi's $199 monthly plan.
[JobsPipe](https://datacircle.dev/company-technology-apis/jobspipe/149-monthly-growth-post-v1-stack-scan/llms.txt), [DetectZeStack](https://datacircle.dev/company-technology-apis/detectzestack/79-monthly-mega-get-analyze/llms.txt) and [GetProspect](https://datacircle.dev/company-technology-apis/getprospect/49-monthly/llms.txt) are the best tech stack API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/company-technology-apis/companyfacts/free
- [Tech stack API: find a company's technologies](https://datacircle.dev/best-tech-stack-api.txt)
- Get it: https://companyfacts.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Request: `GET https://companyfacts.dev/v1/tech-stack`
- API key: not needed
- Its API docs: https://companyfacts.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Sold by: Companyfacts (https://companyfacts.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing)
- Checked: 2026-11-05

## In the answer

- Completeness: 8%
- Categories: ✓

## Price

- $ per 1,000 companies: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: /v1/companies endpoint · /v1/jobs endpoint · /v1/changes endpoint · /v1/read endpoint · /v1/email-check endpoint · /v1/domain endpoint · /v1/vat endpoint · /v1/company-registry endpoint · /v1/papers endpoint · /v1/hacker-news endpoint · /v1/sec-financials endpoint · /v1/hiring-summary endpoint · /v1/federal-contracts endpoint · /v1/app-store endpoint · /v1/company endpoint · /v1/company-contacts endpoint · /v1/new-businesses endpoint · /v1/company-changes endpoint · /v1/company-search endpoint · /v1/x402-route endpoint

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Fetch one web page and report the technologies behind it (CMS, ecommerce platform, analytics, CDN, web server, frameworks, payment processors, email provider) with a confidence and the evidence for each.

## Data

- Freshness: live
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: $0
- Enough for: 300 calls a month

## Rate limit

- Per day: 10
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: url. Optional: min_confidence
- Method: GET
- Path: /v1/tech-stack

## About the plan

- Plan: Free
- Who can get it: anyone

## The 4 fields the plan's answer can hold

technology, category, confidence, evidence

## Companyfacts's plans (4)

- [Companyfacts, free](https://datacircle.dev/company-technology-apis/companyfacts/free/llms.txt): $0.00 per 1,000, 8% complete, live
- [Companyfacts, pay as you go](https://datacircle.dev/company-technology-apis/companyfacts/pay-as-you-go/llms.txt): $3.00 per 1,000, 8% complete, live
- [Companyfacts, $10 pack](https://datacircle.dev/company-technology-apis/companyfacts/10-pack/llms.txt): $5.00 per 1,000, 8% complete, live
- [Companyfacts, $49 monthly](https://datacircle.dev/company-technology-apis/companyfacts/49-monthly/llms.txt): $2.45 per 1,000, 8% complete, live

## Companyfacts's calls for this API (1)

- `GET /v1/tech-stack`: [Companyfacts, free](https://datacircle.dev/company-technology-apis/companyfacts/free/llms.txt)

## Companyfacts's APIs (6)

- [Companyfacts: business verification API pricing, 4 plans](https://datacircle.dev/business-verification-apis/companyfacts/free/llms.txt)
- [Companyfacts: company open jobs API pricing, 4 plans](https://datacircle.dev/company-open-job-apis/companyfacts/free/llms.txt)
- [Companyfacts: tech stack API pricing, 4 plans](https://datacircle.dev/company-technology-apis/companyfacts/free/llms.txt)
- [Companyfacts: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/companyfacts/free/llms.txt)
- [Companyfacts: web scraping API pricing, 4 plans](https://datacircle.dev/web-scraping-apis/companyfacts/free/llms.txt)
- [Companyfacts: company enrichment API pricing, 4 plans, GET /v1/company](https://datacircle.dev/company-enrichment-apis/companyfacts/free-get-v1-company/llms.txt)
- [Companyfacts: company enrichment API pricing, 4 plans, GET /v1/company-contacts](https://datacircle.dev/company-enrichment-apis/companyfacts/free-get-v1-company-contacts/llms.txt)

## Companyfacts: tech stack API alternatives

- [StackPeek, $9 monthly, Starter, GET /api/v1/detect](https://datacircle.dev/company-technology-apis/stackpeek/9-monthly-starter-get-api-v1-detect/llms.txt): $1.80 per 1,000, 23% complete, live
- [ReefAPI, $1,200 yearly](https://datacircle.dev/company-technology-apis/reefapi/1200-yearly/llms.txt): $2.00 per 1,000, 23% complete, live
- [1Lookup, $7,990 yearly, Professional (annual), POST /bulk/jobs](https://datacircle.dev/company-technology-apis/1lookup/7990-yearly-professional-annual-post-bulk-jobs/llms.txt): $2.663 per 1,000, 23% complete, live
- [AI Website Detector, €49 monthly](https://datacircle.dev/company-technology-apis/ai-website-detector/49-monthly/llms.txt): $2.757 per 1,000, 8% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-05.

- https://companyfacts.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://companyfacts.dev/company-data-api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://companyfacts.dev/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://companyfacts.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://companyfacts.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://companyfacts.dev/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing