OpenCorporates alternatives
OpenCorporates is a company-data business built on open company registers, sold as annual API plans capped by monthly and daily call counts, with bulk-data delivery and a choice of jurisdictions on the enterprise plan. The services below are the other options in the same category, each with the figures its own public pages state as of 2026-09-10. Spaw is listed first because this is Spaw's site; the side-by-side comparison has the full table.
| service | pricing model | free tier | price per 1,000 at ~10k |
|---|---|---|---|
| Spaw | Pay-as-you-go credit packs, or optional monthly plans that deposit the same credits every month for less; both through Stripe Checkout, credits from either never expire | 10 free credits every month, no card required | $7.80 (Growth pack: 5,000 credits for $39), or $5.80 on the Growth monthly plan (5,000 credits for $29 a month) |
| Companies House API | No price is published on the developer pages checked; access is through a registered application and its key. | not on the pages read | not on the pages read |
Spaw
Verification API that bills per answered lookup across six signals on one key and one balance: Email verification, Phone intelligence, IP intelligence, Address verification, Business verification against open registers, and Cross-signal consistency, which runs any subset of the first four in one call and names where they agree and where they do not. The business side reads a Legal Entity Identifier or a UK company number against register files synced onto the server, and compares the two records where a LEI names a UK company.
Developers who want to know an identifier belongs to a real, live entity, and want the LEI record and the national register checked against each other rather than trusted separately.
Companies House API
The Companies House Public Data API is the UK registrar's own service: "The Companies House API lets you retrieve information about limited companies (and other companies that fall within the Companies Act 2006). The data returned is live and real-time, and is simple to use and understand."
Anyone who needs the UK register as it stands right now, and only the UK register. It is the registrar's own service and will always be more current than a copy of its monthly file.
Start with the free grant
Every Spaw account gets free credits every month with no card. Verify a sample from your list and compare the verdicts before you commit to anything.
OpenCorporates and the other product names are trademarks of their owners. Spaw is not affiliated with them. Markdown version: /alternatives/opencorporates.md