# StackPeek, free: Tech stack API

> Detect any website's tech stack via API. One GET request returns frameworks, CMS, hosting, analytics, payments, and more. Structured JSON. Sub-500ms.

StackPeek's tech stack API on its Free plan. It costs $0.00 per 1,000 companies. It returns 3 of the 13 key fields we check: Technology, Categories, When and where seen.
In [our tech stack API benchmark](https://datacircle.dev/best-tech-stack-api.txt), StackPeek's best plan scores 54.5 out of 100.
This plan is free. We rank 287 plans for tech stack APIs by price. Half the plans cost $9.98 per 1,000 companies or less.
[Botoi's $199 monthly plan](https://datacircle.dev/company-technology-apis/botoi/199-monthly/llms.txt) costs the least 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 our benchmark.

- This page: https://datacircle.dev/company-technology-apis/stackpeek/free
- [Tech stack API: find a company's technologies](https://datacircle.dev/best-tech-stack-api.txt)
- Get it: https://stackpeek.web.app/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Request: `GET https://stackpeek.web.app/api/v1/detect`
- API key: not needed
- Its API docs: https://stackpeek.web.app/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing#detect
- Sold by: StackPeek (https://stackpeek.web.app?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing)
- Checked: 2026-11-04

## In the answer

- Completeness: 23%
- Technology: ✓
- Categories: ✓
- When and where seen: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Detect any website's tech stack via API. One GET request returns frameworks, CMS, hosting, analytics, payments, and more. Structured JSON. Sub-500ms.

## Data

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

## Plan

- Pay: $0
- You get: 100 requests a day
- Enough for: 100 calls a day
- Expires: reset daily at midnight UTC

## Rate limit

- Per day: 100
- Per second: 1.67
- Batch: 1

## Speed

- Answer: in the call
- Median: 0.66 s

## The call

- You send: url
- Method: GET
- Path: /api/v1/detect

## About the plan

- Plan: Free
- Who can get it: anyone, no credit card, no API key

## The 9 fields the plan's answer can hold

url, technologies, technology name, technology category, technology confidence, technologies by category, technology count, scan duration, scan timestamp

## StackPeek's plans (3)

- [StackPeek, free](https://datacircle.dev/company-technology-apis/stackpeek/free/llms.txt): $0.00 per 1,000, 23% complete, live
- [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
- [StackPeek, $29 monthly, Pro, GET /api/v1/detect](https://datacircle.dev/company-technology-apis/stackpeek/29-monthly-pro-get-api-v1-detect/llms.txt): $1.16 per 1,000, 23% complete, live

## StackPeek's calls (2)

- `GET /api/v1/detect`: [StackPeek, free](https://datacircle.dev/company-technology-apis/stackpeek/free/llms.txt)
- `POST /api/v1/detect/batch`: [StackPeek, $9 monthly, Starter, POST /api/v1/detect/batch](https://datacircle.dev/company-technology-apis/stackpeek/9-monthly-starter-post-api-v1-detect-batch/llms.txt)

## StackPeek's APIs (1)

- [StackPeek: tech stack API pricing, 3 plans](https://datacircle.dev/company-technology-apis/stackpeek/free/llms.txt)

## StackPeek: tech stack API alternatives

- [Bright Data, $499 monthly](https://datacircle.dev/company-technology-apis/bright-data/499-monthly/llms.txt): $1.30 per 1,000, 38% complete, live
- [1Lookup, $19,990 yearly, Enterprise (annual), POST /bulk/jobs](https://datacircle.dev/company-technology-apis/1lookup/19990-yearly-enterprise-annual-post-bulk-jobs/llms.txt): $1.666 per 1,000, 23% complete, live
- [AI Website Detector, €149 monthly](https://datacircle.dev/company-technology-apis/ai-website-detector/149-monthly/llms.txt): $1.677 per 1,000, 8% 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

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-04.

- https://stackpeek.web.app?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://stackpeek.web.app/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://stackpeek.web.app/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing