# Alion, free: Tech stack API

> The technologies a company uses, read from its own job postings: each technology with how many postings require it, most used first.

Alion's Free to start plan for the tech stack API costs $0.00 per 1,000 companies. We check each provider's docs for 13 fields: Technology, Categories, When and where seen, Spend and 9 more. Alion's docs list none of the 13.
We haven't run Alion through [our tech stack API benchmark](https://datacircle.dev/best-tech-stack-api.txt) yet.
This plan is free. We rank 397 plans for tech stack APIs by price. Half the plans cost $6.00 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/alion/free
- [Company technologies API: tech stack APIs compared](https://datacircle.dev/best-tech-stack-api.txt)
- Get it: https://alion.io/developers/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Request: `GET https://alion.io/mcp/rest/company_tech_stack`
- API key: with the plan, on https://alion.io/developers/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Its API docs: https://alion.io/mcp/openapi?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- Sold by: Alion (https://alion.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 0%

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: company.get · company.getList · job.getList · job.get · market_stats

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: The technologies a company uses, read from its own job postings: each technology with how many postings require it, most used first.

## Data

- Keep data: profiles obtained through the Services: not longer than the purpose they were obtained for requires
- Use data: You also agree that you will not: [...] copy, disclose or distribute Content except as expressly permitted by the Terms, including through automated harvesting or "scraping", use the Services to compile, sell, license, broker, redistribute or otherwise commercialise databases of personal data about Candidates or any other person, in whole or in part, or keep profiles obtained through the Services longer than the purpose they were obtained for requires, ranking people for one specific vacancy or request is allowed, [...] use any Content acquired from the Site for commercial activity or in a manner that directly or indirectly competes with Alion, [...] rent, lease, resell, sublicense, distribute, or otherwise transfer access to any of the Services

## Plan

- Pay: $0
- You get: 30 credits
- Expires: never

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: one of domain, name, url or id
- Method: GET
- Path: /mcp/rest/company_tech_stack

## About the plan

- Plan: Free to start
- Who can get it: anyone who signs up (30 credits at sign-up, no card)

## The 2 fields the plan's answer can hold

technology names, postings requiring the technology

## Alion's plans (4)

- [Alion, free](https://datacircle.dev/company-technology-apis/alion/free/llms.txt): $0.00 per 1,000, 0% complete
- [Alion, $10 pack](https://datacircle.dev/company-technology-apis/alion/10-pack/llms.txt): 0% complete
- [Alion, $29 monthly](https://datacircle.dev/company-technology-apis/alion/29-monthly/llms.txt): 0% complete
- [Alion, $99 monthly](https://datacircle.dev/company-technology-apis/alion/99-monthly/llms.txt): 0% complete

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

- `GET /mcp/rest/company_tech_stack`: [Alion, free](https://datacircle.dev/company-technology-apis/alion/free/llms.txt)

## Alion's APIs (9)

- [Alion: company discovery API pricing, 4 plans](https://datacircle.dev/company-discovery-apis/alion/free/llms.txt)
- [Alion: company enrichment API pricing, 4 plans](https://datacircle.dev/company-enrichment-apis/alion/free/llms.txt)
- [Alion: company funding API pricing, 4 plans](https://datacircle.dev/company-funding-apis/alion/free/llms.txt)
- [Alion: similar companies API pricing, 4 plans](https://datacircle.dev/similar-company-apis/alion/free/llms.txt)
- [Alion: tech stack API pricing, 4 plans](https://datacircle.dev/company-technology-apis/alion/free/llms.txt)
- [Alion: job posting details API pricing, 4 plans](https://datacircle.dev/job-posting-details-apis/alion/free/llms.txt)
- [Alion: job postings API pricing, 4 plans](https://datacircle.dev/job-posting-apis/alion/free/llms.txt)
- [Alion: similar people API pricing, 4 plans](https://datacircle.dev/similar-people-apis/alion/free-no-account/llms.txt)
- [Alion: people search API pricing, 4 plans](https://datacircle.dev/people-search-apis/alion/free-no-account/llms.txt)

## Alion: tech stack API alternatives

- [JobsPipe, free, GET /v1/companies/{key}/technologies](https://datacircle.dev/company-technology-apis/jobspipe/free-get-v1-companies-key-technologies/llms.txt): $0.00 per 1,000, 31% complete, 6 hours
- [DetectZeStack, free, GET /analyze](https://datacircle.dev/company-technology-apis/detectzestack/free-get-analyze/llms.txt): $0.00 per 1,000, 23% complete, 24 hours
- [GetProspect, free](https://datacircle.dev/company-technology-apis/getprospect/free/llms.txt): $0.00 per 1,000, 15% complete, 30 days
- [Tomba, free](https://datacircle.dev/company-technology-apis/tomba/free/llms.txt): $0.00 per 1,000, 15% complete, stored
- [Spytrend, free](https://datacircle.dev/company-technology-apis/spytrend/free/llms.txt): $0.00 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 2026-11-08.

- https://alion.io/developers?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://alion.io/developers/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://alion.io/developers/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://alion.io/mcp/openapi?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://alion.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing
- https://alion.io/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=tech-stack-api-pricing