# Alion, free: Similar companies API

> Lookalikes of one company: the companies that share its industry segments, the technologies its job postings name, its headquarters country and a size band near it.

Alion's Free to start plan for the similar companies API costs $0.00 per 1,000 companies. We check each provider's docs for 13 fields. Alion's docs list 7: Match, Description, Industry and type, Employees, Headquarters, Funding, Domain.
We haven't run Alion through [our similar companies API benchmark](https://datacircle.dev/best-similar-companies-api.txt) yet.
This plan is free. We rank 155 plans for similar companies APIs by price. Half the plans cost $1.18 or less per 1,000 companies. [See the best free similar companies API plan.](https://datacircle.dev/best-similar-companies-api.txt)
[GovConAPI's $39 monthly plan](https://datacircle.dev/similar-company-apis/govconapi/39-monthly/llms.txt) is the cheapest paid plan per 1,000 companies. GovConAPI's plan covers companies in the United States only. GovConAPI's $39 monthly plan charges nothing per call. You get as many companies as GovConAPI's rate limit allows. [Tomba's pay-as-you-go plan](https://datacircle.dev/similar-company-apis/tomba/pay-as-you-go/llms.txt) costs the least for 10,000 companies a month: $1.25.
[ZoomInfo's $45 pack](https://datacircle.dev/similar-company-apis/zoominfo/45-pack/llms.txt) covers any number of companies. ZoomInfo's $45 pack costs more up front than GovConAPI's $39 monthly plan.
[ScrapeAtlas](https://datacircle.dev/similar-company-apis/scrapeatlas/19-pack/llms.txt), [LeadMagic](https://datacircle.dev/similar-company-apis/leadmagic/249-monthly-growth-post-v3-companies-lookalike/llms.txt) and [Tomba](https://datacircle.dev/similar-company-apis/tomba/449-monthly/llms.txt) are the best similar companies API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/similar-company-apis/alion/free
- [Similar companies API: the best of 20+ providers compared](https://datacircle.dev/best-similar-companies-api.txt)
- Get it: https://alion.io/developers/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Request: `GET https://alion.io/mcp/rest/similar_companies`
- API key: with the plan, on https://alion.io/developers/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Its API docs: https://alion.io/mcp/openapi?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Sold by: Alion (https://alion.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 54%
- Match: ✓
- Description: ✓
- Industry and type: ✓
- Employees: ✓
- Headquarters: ✓
- Funding: ✓
- Domain: ✓

## 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: Lookalikes of one company: the companies that share its industry segments, the technologies its job postings name, its headquarters country and a size band near it.

## 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: company. Optional: country, detail, limit
- Method: GET
- Path: /mcp/rest/similar_companies

## About the plan

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

## The 35 fields the plan's answer can hold

company ID, name, domain, URL, industry, industry segment, size band, founded year, is startup, last funding round, last funding round amount, last funding round date, total funding, is staffing agency, claimed, employer type, headquarters, open jobs, last job posted, ATS vendor, coverage, is hiring, new jobs 30 days, hiring signal score, hiring signal level, AI level, site scanned at, board verified at, profile updated at, description excerpt, similarity score, shared segments, shared technologies, same headquarters country, size band gap

## Alion's plans (4)

- [Alion, free](https://datacircle.dev/similar-company-apis/alion/free/llms.txt): $0.00 per 1,000, 54% complete
- [Alion, $10 pack](https://datacircle.dev/similar-company-apis/alion/10-pack/llms.txt): 54% complete
- [Alion, $29 monthly](https://datacircle.dev/similar-company-apis/alion/29-monthly/llms.txt): 54% complete
- [Alion, $99 monthly](https://datacircle.dev/similar-company-apis/alion/99-monthly/llms.txt): 54% complete

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

- `GET /mcp/rest/similar_companies`: [Alion, free](https://datacircle.dev/similar-company-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: similar companies API alternatives

- [ScrapeAtlas, free](https://datacircle.dev/similar-company-apis/scrapeatlas/free/llms.txt): $0.00 per 1,000, 8% complete, live
- [Tomba, free](https://datacircle.dev/similar-company-apis/tomba/free/llms.txt): $0.00 per 1,000, 15% complete, stored
- [Findymail, free](https://datacircle.dev/similar-company-apis/findymail/free/llms.txt): $0.00 per 1,000, 23% complete
- [Omkar Cloud, free](https://datacircle.dev/similar-company-apis/omkar-cloud/free/llms.txt): $0.00 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 2026-11-08.

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