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Companies House Public Data API

Civic & Legal Free key (no card)

AuthenticationFree key (no card)
Rate limitNo published quota for the free key; stay within fair use

Documentation: developer-specs.company-information.service.gov.uk ยท Checked Sep 13, 2026

About

Search every registered UK company: profiles, officers, persons with significant control, filing history, charges, and insolvency. The public data API is free; you just register an app in the Developer Hub and get a key (used as the HTTP Basic username, password left blank).

Details

Free to start. You may need a free key, but no credit card.

Auth: Free key (no card)

Rate limit: No published quota for the free key; stay within fair use

Verified: 2026-09-13

Best for: sales teams compliance journalists

Read the docs Back to catalog

Setup

  1. Register an app in the Companies House Developer Hub
  2. Create a free API key
  3. Call endpoints with HTTP Basic Auth: API key as username, blank password
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