# Canonical, free: Similar companies API

> Given a seed company (company_domain — the domain field from search or lookup results), returns companies similar to it.

Canonical's similar companies API on its Free plan. It costs $0.00 per 1,000 companies. Canonical's docs list 9 of the 13 fields on our checklist: Match, Description, Industry and type, Technologies, Employees, Headquarters, Funding, Revenue, Domain.
We haven't run Canonical through [our similar companies API benchmark](https://datacircle.dev/best-similar-companies-api.txt) yet.
This plan is free. We rank 142 plans for similar companies APIs by price. Half the plans cost $1.685 per 1,000 companies or less. [See how many similar companies API plans are free.](https://datacircle.dev/best-similar-companies-api.txt)
[PublicWWW's $499 monthly plan](https://datacircle.dev/similar-company-apis/publicwww/499-monthly/llms.txt) costs the least per 1,000 companies: $0.000055. PublicWWW charges for each page of results. We count 1,000,000 companies on each page to get the $0.000055 price.
[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 less up front than PublicWWW's $499 monthly plan.
[ScrapeAtlas](https://datacircle.dev/similar-company-apis/scrapeatlas/19-pack/llms.txt), [LeadMagic](https://datacircle.dev/similar-company-apis/leadmagic/499-monthly-professional-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/canonical/free
- [Similar companies API: the best of 20+ providers compared](https://datacircle.dev/best-similar-companies-api.txt)
- Get it: https://trycanonical.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Request: `POST https://trycanonical.ai/api/v1/similar`
- API key: with the plan, on https://trycanonical.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Its API docs: https://trycanonical.ai/documentation/reference?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing#tag/companies/POST/api/v1/similar
- Sold by: Canonical (https://trycanonical.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing)
- Checked: 2026-11-07

## In the answer

- Completeness: 69%
- Match: ✓
- Description: ✓
- Industry and type: ✓
- Technologies: ✓
- Employees: ✓
- Headquarters: ✓
- Funding: ✓ 1 day
- Revenue: ✓
- Domain: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Search companies (natural language) · Search companies (NL or structured) · Look up companies by name · Get company details · Find people · Look up people by name

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Given a seed company (company_domain — the domain field from search or lookup results), returns companies similar to it.

## Data

- Freshness: stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- Keep data: during the Subscription Term
- Use data: licence "to access and use the Service and Content solely for your internal personal or business use as expressly permitted by the Service". "You agree that you will not, and will not permit any third party to: copy, reproduce, modify, translate, adapt, create derivative works of, publicly display, publish, distribute, sell, sublicense or otherwise exploit any portion of the Service or the Content, except as expressly permitted by these Terms, redistribute, resell, lease, share, host or otherwise make available the Service or any Content (in original or derivative form) to or for the benefit of any third party, including by way of any service bureau, data feed, white-label or syndication arrangement, use the Service or Content to train, fine-tune, evaluate, benchmark or otherwise develop any artificial intelligence, machine learning or large language model, or to create any product or service that is competitive with the Service, scrape, crawl, harvest, index, mine or otherwise extract data or Content from the Service by automated or manual means, except via interfaces and to the extent expressly authorised by us in writing, [...] circumvent, disable, interfere with or attempt to bypass any security, authentication, rate-limiting, billing, usage tracking or access-control feature of the Service, [...] remove, obscure or alter any proprietary notice, attribution or branding contained in the Service or the Content"

## Plan

- Pay: $0
- You get: 250 credits
- Enough for: 250 results

## Rate limit

- Per day: 1,000
- Per second: 0.33
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: one of company_domain or company_id. Optional: max_results, intent
- Method: POST
- Path: /api/v1/similar

## About the plan

- Plan: Free
- Who can get it: anyone aged 18 or over with the legal capacity to enter a binding contract, no card required

## The 29 fields the plan's answer can hold

name, website, domain, headquarters, employee count, founding year, public company, channel, industry, offering, offering type, revenue model, business model, offering domain, target customer, business category, technology application, total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors, description, match verdict, match verdict reason, similarity score

## Canonical's plans (7)

- [Canonical, free](https://datacircle.dev/similar-company-apis/canonical/free/llms.txt): $0.00 per 1,000, 69% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, top-up, Extra credits (Pro)](https://datacircle.dev/similar-company-apis/canonical/top-up-extra-credits-pro/llms.txt): $8.00 per 1,000, 69% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, top-up, Extra credits (Starter)](https://datacircle.dev/similar-company-apis/canonical/top-up-extra-credits-starter/llms.txt): $10.00 per 1,000, 69% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, top-up, Extra credits (Lite)](https://datacircle.dev/similar-company-apis/canonical/top-up-extra-credits-lite/llms.txt): $15.00 per 1,000, 69% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, $10 monthly](https://datacircle.dev/similar-company-apis/canonical/10-monthly/llms.txt): $15.015 per 1,000, 69% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, $20 monthly](https://datacircle.dev/similar-company-apis/canonical/20-monthly/llms.txt): $10.00 per 1,000, 69% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)
- [Canonical, $100 monthly](https://datacircle.dev/similar-company-apis/canonical/100-monthly/llms.txt): $8.00 per 1,000, 69% complete, stored (total funding (USD), funding round count, latest funding date, latest funding amount (USD), latest funding series, latest post-money valuation, latest lead investor, investors: 1 day)

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

- `POST /api/v1/similar`: [Canonical, free](https://datacircle.dev/similar-company-apis/canonical/free/llms.txt)

## Canonical's APIs (5)

- [Canonical: company enrichment API pricing, 7 plans](https://datacircle.dev/company-enrichment-apis/canonical/free/llms.txt)
- [Canonical: company hierarchy API pricing, 7 plans](https://datacircle.dev/company-hierarchy-apis/canonical/free/llms.txt)
- [Canonical: similar companies API pricing, 7 plans](https://datacircle.dev/similar-company-apis/canonical/free/llms.txt)
- [Canonical: people search API pricing, 7 plans, POST /api/v1/people/search](https://datacircle.dev/people-search-apis/canonical/free-post-api-v1-people-search/llms.txt)
- [Canonical: people search API pricing, 7 plans, POST /api/v1/people/lookup](https://datacircle.dev/people-search-apis/canonical/free-post-api-v1-people-lookup/llms.txt)
- [Canonical: company discovery API pricing, 7 plans, POST /api/v1/lookup](https://datacircle.dev/company-discovery-apis/canonical/free-post-api-v1-lookup/llms.txt)
- [Canonical: company discovery API pricing, 7 plans, GET /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/free-get-api-v1-search/llms.txt)
- [Canonical: company discovery API pricing, 7 plans, POST /api/v1/search](https://datacircle.dev/company-discovery-apis/canonical/free-post-api-v1-search/llms.txt)

## Canonical: similar companies API alternatives

- [CompanyEnrich, $549 monthly, Scale, POST /companies/similar/scroll, Scroll](https://datacircle.dev/similar-company-apis/companyenrich/549-monthly-scale-post-companies-similar-scroll-scroll/llms.txt): $5.49 per 1,000, 85% complete, stored
- [Klazify, $39.99 monthly](https://datacircle.dev/similar-company-apis/klazify/39-99-monthly/llms.txt): $7.998 per 1,000, 8% complete, stored
- [Ocean.io, $3,000 yearly](https://datacircle.dev/similar-company-apis/ocean-io/3000-yearly/llms.txt): $10.00 per 1,000, 92% complete, stored
- [Fokals, pay as you go, Past 100,000 companies a month, POST /similar_companies](https://datacircle.dev/similar-company-apis/fokals/pay-as-you-go-past-100000-companies-a-month-post-similar-companies/llms.txt): $10.00 per 1,000, 15% complete, stored

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-07.

- https://trycanonical.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://trycanonical.ai/api/v1/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://trycanonical.ai/documentation/rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://trycanonical.ai/documentation/reference?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://trycanonical.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://trycanonical.ai/refund-policy?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://trycanonical.ai/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing