# Harmonic, contact us: Similar companies API

> Find companies similar to one you send.

Harmonic's similar companies API on its API access plan. It returns none of the 13 key fields we check: Match, Description, Industry and type, Images and 9 more.
We haven't run Harmonic through [our similar companies API benchmark](https://datacircle.dev/best-similar-companies-api.txt) yet.
Harmonic gives this plan's price on request. We rank 120 plans for similar companies APIs by price. Half the plans cost $1.265 per 1,000 companies or less.
[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.
[LeadMagic](https://datacircle.dev/similar-company-apis/leadmagic/499-monthly-professional-post-v3-companies-lookalike/llms.txt), [Tomba](https://datacircle.dev/similar-company-apis/tomba/449-monthly/llms.txt) and [Social Fetch](https://datacircle.dev/similar-company-apis/social-fetch/14-pack/llms.txt) are the best similar companies API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/similar-company-apis/harmonic/contact-us
- [Similar companies API: 9 providers compared](https://datacircle.dev/best-similar-companies-api.txt)
- Get it: https://harmonic.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Request: `GET https://api.harmonic.ai/search/similar_companies/{id_or_urn}`
- API key: with the plan, on https://harmonic.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Its API docs: https://console.harmonic.ai/docs?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- Sold by: Harmonic (https://harmonic.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing)
- Checked: 2026-11-04

## In the answer

- Completeness: 0%

## Price

- Billing: contact

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Find companies similar to one you send.

## Data

- Keep data: no limit
- Use data: only for your internal business purposes, such as investment, research, recruiting, sourcing, corporate development and business development, you may not publish, display, license, sell or provide Company Data to a third party without Harmonic's prior written approval

## Speed

- Answer: in the call

## The call

- You send: company ID or URN
- Method: GET
- Path: /search/similar_companies/{id_or_urn}

## About the plan

- Plan: API access
- Who can get it: anyone

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

entity URN, ID

## Harmonic's plans (1)

- [Harmonic, contact us](https://datacircle.dev/similar-company-apis/harmonic/contact-us/llms.txt): 0% complete

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

- `GET /search/similar_companies/{id_or_urn}`: [Harmonic, contact us](https://datacircle.dev/similar-company-apis/harmonic/contact-us/llms.txt)

## Harmonic's APIs (4)

- [Harmonic: company discovery API pricing, 1 plan](https://datacircle.dev/company-discovery-apis/harmonic/contact-us/llms.txt)
- [Harmonic: company enrichment API pricing, 1 plan](https://datacircle.dev/company-enrichment-apis/harmonic/contact-us/llms.txt)
- [Harmonic: similar companies API pricing, 1 plan](https://datacircle.dev/similar-company-apis/harmonic/contact-us/llms.txt)
- [Harmonic: people enrichment API pricing, 1 plan](https://datacircle.dev/person-enrichment-apis/harmonic/contact-us/llms.txt)

## Harmonic: similar companies API alternatives

- [Monocrawl, contact us](https://datacircle.dev/similar-company-apis/monocrawl/contact-us/llms.txt): 8% complete
- [Scrappa, contact us](https://datacircle.dev/similar-company-apis/scrappa/contact-us/llms.txt): 0% complete
- [CompanyPulse, contact us](https://datacircle.dev/similar-company-apis/companypulse/contact-us/llms.txt): 0% complete
- [Generect, contact us, Enterprise, POST /api/v1/enrich/database/company/, Enrich company from database, people also follow](https://datacircle.dev/similar-company-apis/generect/contact-us-enterprise-post-api-v1-enrich-database-company-enrich-company-from-database-people-also-follow/llms.txt): 0% 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 2026-11-04.

- https://api.harmonic.ai/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://harmonic.ai/legal/terms-of-service?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://harmonic.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://support.harmonic.ai/en/articles/12785899-harmonic-mcp-server-getting-started-guide?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing
- https://support.harmonic.ai/en/collections/3238662-api-bulk-data-integrations?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=similar-companies-api-pricing