# Ambolt, free: Tech stack API

> Detect the technologies a public website uses: CMS or site builder, JavaScript framework, CDN and hosting, web server, analytics and tag managers, advertising pixels, support widgets, payments, consent tools. Each result shows its evidence (header, meta tag, script URL or page source) and a confidence level. Reads one page, respects robots.txt.

Ambolt's Free call a day plan for the tech stack API costs $0.00 per 1,000 companies. Ambolt's docs list 1 of the 13 fields on our checklist: Technology.
You get up to 600 results a month.
We haven't run Ambolt through [our tech stack API benchmark](https://datacircle.dev/best-tech-stack-api.txt) yet.
This plan is free. We rank 390 plans for tech stack APIs by price. Half the plans cost $5.663 or less per 1,000 companies. [See the best free tech stack API plan.](https://datacircle.dev/best-tech-stack-api.txt)
[cl0q's $50 monthly plan](https://datacircle.dev/company-technology-apis/cl0q/50-monthly/llms.txt) is the cheapest paid plan per 1,000 companies: $0.0042. [Enterno's ₽2,511 yearly plan](https://datacircle.dev/company-technology-apis/enterno/2511-yearly-explorer-get-api-v4-cms/llms.txt) costs the least for 10,000 companies a month: about $2.50.
[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 cl0q's $50 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/ambolt/free
- [Company technologies API: tech stack APIs compared](https://datacircle.dev/best-tech-stack-api.txt)
- Get it: https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Request: `GET https://api.ambolt.dev/v1/tech-stack-lookup`
- API key: not needed
- Its API docs: https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing#/paths/~1v1~1tech-stack-lookup
- Sold by: Ambolt (https://ambolt.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 8%
- Technology: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Detect the technologies a public website uses: CMS or site builder, JavaScript framework, CDN and hosting, web server, analytics and tag managers, advertising pixels, support widgets, payments, consent tools. Each result shows its evidence (header, meta tag, script URL or page source) and a confidence level. Reads one page, respects robots.txt.

## Data

- Freshness: live
- Keep data: no limit
- Use data: Do not use the services to attack or overload systems, to evade sanctions, or in breach of law. [...] Each developer-tool response names its source and licence. Where a source requires attribution, you must keep it when you reuse the data.

## Plan

- Pay: $0
- Enough for: 600 results a month

## Rate limit

- Per day: 1
- Batch: 20

## Speed

- Answer: in the call

## The call

- You send: one of url or urls. Optional: free
- Method: GET
- Path: /v1/tech-stack-lookup

## About the plan

- Plan: Free call a day
- Who can get it: anyone, with no account or API key: one free call per tool and IP address per day

## The 11 fields the plan's answer can hold

CMS or site builder, JavaScript framework, CDN and hosting, web server, analytics and tag managers, advertising pixels, support widgets, payments, consent tools, evidence, confidence

## Ambolt's plans (2)

- [Ambolt, free](https://datacircle.dev/company-technology-apis/ambolt/free/llms.txt): $0.00 per 1,000, 8% complete, live
- [Ambolt, pay as you go](https://datacircle.dev/company-technology-apis/ambolt/pay-as-you-go/llms.txt): $5.00 per 1,000, 8% complete, live

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

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

## Ambolt's APIs (6)

- [Ambolt: tech stack API pricing, 2 plans](https://datacircle.dev/company-technology-apis/ambolt/free/llms.txt)
- [Ambolt: domain WHOIS API pricing, 2 plans](https://datacircle.dev/domain-whois-apis/ambolt/free/llms.txt)
- [Ambolt: email verification API pricing, 2 plans](https://datacircle.dev/validate-email-apis/ambolt/free/llms.txt)
- [Ambolt: web scraping API pricing, 2 plans](https://datacircle.dev/web-scraping-apis/ambolt/free/llms.txt)
- [Ambolt: company enrichment API pricing, 2 plans, GET /v1/brazil-cnpj-lookup](https://datacircle.dev/company-enrichment-apis/ambolt/free-call-a-day-get-v1-brazil-cnpj-lookup/llms.txt)
- [Ambolt: company enrichment API pricing, 2 plans, GET /v1/eu-vat-validate](https://datacircle.dev/company-enrichment-apis/ambolt/free-call-a-day-get-v1-eu-vat-validate/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/entity-resolve](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-entity-resolve/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/lei-lookup](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-lei-lookup/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/nordic-company-lookup](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-nordic-company-lookup/llms.txt)
- [Ambolt: business verification API pricing, 2 plans, GET /v1/us-business-entities](https://datacircle.dev/business-verification-apis/ambolt/free-call-a-day-get-v1-us-business-entities/llms.txt)

## Ambolt: tech stack API alternatives

- [1Lookup, $99 monthly, Starter, POST /tech-stack-lookup](https://datacircle.dev/company-technology-apis/1lookup/99-monthly-starter-post-tech-stack-lookup/llms.txt): $4.95 per 1,000, 23% complete, live
- [QuanticData, top-up from $5](https://datacircle.dev/company-technology-apis/quanticdata/top-up-from-5/llms.txt): $5.00 per 1,000, 23% complete, live
- [Companyfacts, $10 pack](https://datacircle.dev/company-technology-apis/companyfacts/10-pack/llms.txt): $5.00 per 1,000, 8% complete, live
- [RankParse, $468 yearly](https://datacircle.dev/company-technology-apis/rankparse/468-yearly/llms.txt): $5.20 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 2026-11-08.

- https://ambolt.dev?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://ambolt.dev/licences?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://ambolt.dev/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://ambolt.dev/privacy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://ambolt.dev/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://api.ambolt.dev/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://api.ambolt.dev/catalog.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://api.ambolt.dev/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing