# KnowFirst, free: Tech stack API

> A business's website tech stack.

KnowFirst's tech stack API on its Free plan. It costs $0.00 per 1,000 companies. KnowFirst's docs list 2 of the 13 key fields we check: Technology, Categories.
We haven't run KnowFirst through [our tech stack API benchmark](https://datacircle.dev/best-tech-stack-api.txt) yet.
This plan is free. We rank 354 plans for tech stack APIs by price. Half the plans cost $7.96 per 1,000 companies or less.
[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.
[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/knowfirst/free
- [Tech stack API: find a company's technologies](https://datacircle.dev/best-tech-stack-api.txt)
- Get it: https://knowfirst.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Request: `GET https://api.knowfirst.ai/v1/business/view/tech_stack`
- API key: with the plan, on https://knowfirst.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Its API docs: https://app.knowfirst.ai/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Sold by: KnowFirst (https://knowfirst.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing)
- Checked: 2026-11-06

## In the answer

- Completeness: 15%
- Technology: ✓
- Categories: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: GET /business/list · GET /business/list/{views} · GET /business/enrich · GET /business/view/{views} · GET /business/view/overview · GET /business/view/locations · GET /business/view/socials · GET /business/view/ads · GET /business/view/organic · GET /business/view/directories · GET /business/view/domains · GET /business/view/jobs · GET /business/view/people · GET /business/view/salaries · GET /business/view/news · GET /business/view/contracts · GET /business/view/trademarks · GET /business/view/awards · GET /business/view/customer_reviews · GET /business/view/employee_reviews · GET /business/view/feed · GET /business/view/related · GET /domain/list/{views} · GET /person/list · GET /person/view/{id} · GET /person/view · GET /location/list · GET /business/suggestions · POST /business/list/export · GET /person/list/export

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: A business's website tech stack.

## Data

- Keep data: you must not [...] store [...] any part of the Website and API [...] without prior written consent from us
- Use data: you must not in any form or by any means copy, adapt, reproduce (other than for the purpose of viewing the Website and API in your browser), store, modify, distribute, print, upload, display, publish or create derivative works from any part of the Website and API or commercialise any information obtained from any part of the Website and API without prior written consent from us [...] You acknowledge and agree that you will: [...] h) not alter, modify, decompile, disassemble, reverse engineer, sublicense or change any software that underpins the Website and API, i) not purport to grant to a third party any right to access or use our Website and API except as permitted by us [...] You acknowledge that you must: a) not resupply the Website and API to third parties, or permit third parties to access the Website and API [...] You agree that you will only use and disclose any personal information that you access through the Website and API in a manner that would be permitted under the Privacy Act 1988 (Cth) by an APP entity

## Plan

- Pay: A$0
- You get: 20 credits
- Enough for: 20 calls

## Rate limit

- Per day: 50,000
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: one of id, abn, acn, nzbn, url or stockcode
- Method: GET
- Path: /business/view/tech_stack

## About the plan

- Plan: Free
- Who can get it: anyone

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

business ID, domain, domain screenshot, domain contact email, technology category, technology name, technology description, technology logo, next token

## KnowFirst's plans (8)

- [KnowFirst, free](https://datacircle.dev/company-technology-apis/knowfirst/free/llms.txt): $0.00 per 1,000, 15% complete
- [KnowFirst, A$120 monthly](https://datacircle.dev/company-technology-apis/knowfirst/a-120-monthly/llms.txt): $417.528 per 1,000, 15% complete
- [KnowFirst, A$216 monthly](https://datacircle.dev/company-technology-apis/knowfirst/a-216-monthly/llms.txt): $250.517 per 1,000, 15% complete
- [KnowFirst, A$600 monthly](https://datacircle.dev/company-technology-apis/knowfirst/a-600-monthly/llms.txt): $208.764 per 1,000, 15% complete
- [KnowFirst, A$720 yearly](https://datacircle.dev/company-technology-apis/knowfirst/a-720-yearly/llms.txt): $208.764 per 1,000, 15% complete
- [KnowFirst, A$1,296 yearly](https://datacircle.dev/company-technology-apis/knowfirst/a-1296-yearly/llms.txt): $125.258 per 1,000, 15% complete
- [KnowFirst, A$3,600 yearly](https://datacircle.dev/company-technology-apis/knowfirst/a-3600-yearly/llms.txt): $104.382 per 1,000, 15% complete
- [KnowFirst, contact us](https://datacircle.dev/company-technology-apis/knowfirst/contact-us/llms.txt): 15% complete

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

- `GET /business/view/tech_stack`: [KnowFirst, free](https://datacircle.dev/company-technology-apis/knowfirst/free/llms.txt)

## KnowFirst's APIs (6)

- [KnowFirst: company discovery API pricing, 8 plans](https://datacircle.dev/company-discovery-apis/knowfirst/free/llms.txt)
- [KnowFirst: company open jobs API pricing, 8 plans](https://datacircle.dev/company-open-job-apis/knowfirst/free/llms.txt)
- [KnowFirst: tech stack API pricing, 8 plans](https://datacircle.dev/company-technology-apis/knowfirst/free/llms.txt)
- [KnowFirst: people search API pricing, 8 plans](https://datacircle.dev/people-search-apis/knowfirst/free/llms.txt)
- [KnowFirst: people enrichment API pricing, 8 plans](https://datacircle.dev/person-enrichment-apis/knowfirst/free/llms.txt)
- [KnowFirst: company enrichment API pricing, 8 plans, GET /business/view/overview](https://datacircle.dev/company-enrichment-apis/knowfirst/free-get-business-view-overview/llms.txt)
- [KnowFirst: company enrichment API pricing, 8 plans, GET /business/enrich](https://datacircle.dev/company-enrichment-apis/knowfirst/free-get-business-enrich/llms.txt)

## KnowFirst: tech stack API alternatives

- [Ful.io, $199 monthly](https://datacircle.dev/company-technology-apis/ful-io/199-monthly/llms.txt): $99.50 per 1,000, 46% complete
- [RichAPI, $100 pack, Starter, POST /website_intelligence](https://datacircle.dev/company-technology-apis/richapi/100-pack-starter-post-website-intelligence/llms.txt): $100.00 per 1,000, 8% complete, live
- [BuiltWith, top-up from $0.50, API credits with Stripe MPP, no account, GET /v26/api.json, Domain API, full](https://datacircle.dev/company-technology-apis/builtwith/top-up-from-0-50-api-credits-with-stripe-mpp-no-account-get-v26-api-json-domain-api-full/llms.txt): $100.00 per 1,000, 85% complete, stored
- [Fokals, top-up from $5](https://datacircle.dev/company-technology-apis/fokals/top-up-from-5/llms.txt): $100.00 per 1,000, 15% complete, 1 day
- [WebTechSurvey, $1,250 yearly, Professional, GET /v1/scan](https://datacircle.dev/company-technology-apis/webtechsurvey/1250-yearly-professional-get-v1-scan/llms.txt): $104.167 per 1,000, 15% 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 2026-11-06.

- https://app.knowfirst.ai/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://cdn.knowfirst.ai/api/spec/knowfirst-v1.yaml?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://knowfirst.ai/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://knowfirst.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://knowfirst.ai/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing