# DetectZeStack, free: Tech stack API

> Side-by-side tech comparison of 2–10 sites in one request. Spot shared infrastructure, identify differentiators, benchmark against competitors.

DetectZeStack'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.
The cheapest of the 64 plans we rank by price is [Botoi, $199 monthly](https://datacircle.dev/company-technology-apis/botoi/199-monthly/llms.txt), at $0.0066 per 1,000 companies.
[JobsPipe](https://datacircle.dev/company-technology-apis/jobspipe/9-80-pack-credit-pack-without-an-account-post-v1-stack-scan/llms.txt), [Botoi](https://datacircle.dev/company-technology-apis/botoi/9-monthly/llms.txt) and [RichAPI](https://datacircle.dev/company-technology-apis/richapi/450-pack/llms.txt) are the best tech stack API providers in our benchmark.

- This page: https://datacircle.dev/company-technology-apis/detectzestack/free
- [Best tech stack API in 2026](https://datacircle.dev/best-tech-stack-api.txt)
- Get it: https://detectzestack.com/pricing
- Request: `POST https://detectzestack.com/compare`
- API key: with the plan, on https://detectzestack.com/pricing
- Its API docs: https://detectzestack.com/openapi.yaml
- Sold by: DetectZeStack (https://detectzestack.com)
- Checked: 2026-10-27

## In the answer

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

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: Create a tech change alert watch: 1 weekly alert · from the same budget: Analyze a URL · Batch analyze multiple URLs · Get technology history · Technology change feed · Check if a website uses a specific technology · Reverse technology lookup — find sites using a technology · Vulnerability scan — CVEs for detected technologies · Check TLS certificate · DNS lookup · Security headers analysis

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Side-by-side tech comparison of 2–10 sites in one request. Spot shared infrastructure, identify differentiators, benchmark against competitors.

## Data

- Keep data: no limit
- Use data: You agree not to use the Service to: Submit URLs you do not have a legitimate research, security, monitoring, or business reason to inspect. Attempt to overwhelm, denial-of-service, or otherwise abuse our infrastructure or any third-party site we resolve on your behalf. Use the Service to facilitate illegal activity, harass any individual or organization, or violate the rights of any third party. Reverse-engineer, decompile, or otherwise extract the source code of the Service beyond what is exposed via the public API. Resell or sublicense the Service without our written permission.

## Plan

- Pay: $0
- You get: 100 requests a month
- Enough for: 1,000 results a month
- Expires: at the start of each calendar month

## Rate limit

- Per second: 5
- Batch: 10

## Speed

- Answer: in the call

## The call

- You send: urls
- Method: POST
- Path: /compare

## About the plan

- Plan: Free
- Who can get it: anyone with an account (a valid email address), no credit card

## The 15 fields the plan's answer can hold

url, domain, technologies, technology name, technology version, technology categories, technology confidence, technology description, technology website, technology icon, technology CPE, technology detection source, unique technologies, shared technologies, total response time

## DetectZeStack's plans (4)

- [DetectZeStack, free](https://datacircle.dev/company-technology-apis/detectzestack/free/llms.txt): $0.00 per 1,000, 23% complete
- [DetectZeStack, $9 monthly](https://datacircle.dev/company-technology-apis/detectzestack/9-monthly/llms.txt): $0.90 per 1,000, 23% complete
- [DetectZeStack, $29 monthly](https://datacircle.dev/company-technology-apis/detectzestack/29-monthly/llms.txt): $0.29 per 1,000, 23% complete
- [DetectZeStack, $79 monthly](https://datacircle.dev/company-technology-apis/detectzestack/79-monthly/llms.txt): $0.158 per 1,000, 23% complete

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

- `POST /compare`: [DetectZeStack, free](https://datacircle.dev/company-technology-apis/detectzestack/free/llms.txt)

## DetectZeStack's APIs (3)

- [DetectZeStack: cached company discovery API pricing, 4 plans](https://datacircle.dev/cached-company-discovery-apis/detectzestack/free/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, GET /analyze](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-analyze/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, POST /analyze/batch](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-post-analyze-batch/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, GET /check](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-check/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, GET /history](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-history/llms.txt)
- [DetectZeStack: cached tech stack API pricing, 4 plans, GET /changes](https://datacircle.dev/cached-company-technology-apis/detectzestack/free-free-get-changes/llms.txt)
- [DetectZeStack: tech stack API pricing, 4 plans](https://datacircle.dev/company-technology-apis/detectzestack/free/llms.txt)

## DetectZeStack: tech stack API alternatives

- [Botoi, $9 monthly](https://datacircle.dev/company-technology-apis/botoi/9-monthly/llms.txt): $0.03 per 1,000, 23% complete, live
- [StartupHub.ai, $500 yearly](https://datacircle.dev/company-technology-apis/startuphub-ai/500-yearly/llms.txt): $0.833 per 1,000, 15% complete
- [JobsPipe, $5,244 yearly](https://datacircle.dev/company-technology-apis/jobspipe/5244-yearly-business-billed-yearly-post-v1-stack-scan/llms.txt): $0.874 per 1,000, 23% complete
- [Derrick, €320 monthly](https://datacircle.dev/company-technology-apis/derrick/320-monthly/llms.txt): $3.601 per 1,000, 8% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-27.

- https://detectzestack.com
- https://detectzestack.com/openapi.yaml
- https://detectzestack.com/pricing
- https://detectzestack.com/terms