Free Clearbit alternative: company enrichment from open data

What is a Clearbit alternative?

A Clearbit alternative is any stack that answers the same enrichment question — «given a domain or company name, return firmographics, ownership, and signals» — after Clearbit itself moved behind HubSpot's platform following the acquisition announced in November 2023, according to HubSpot's press release. The replacement question splits into 4 functions, and each has a different best free source. In our data — the Aidenix Atlas catalog, where every source is live-probed — the open-data route now covers the first three functions with official records rather than scraped copies:

• Company profile and firmographics: government registries, filed by the companies themselves.
• Ownership and officers: beneficial-ownership registers, which no commercial enricher fully mirrors.
• Funding and financial signals: SEC filings, free and traceable to the source document.
• Contact enrichment: the one function open data only partially replaces.

Which open sources replace each enrichment function?

According to our catalog probes on 2026-07-24, all sources below return HTTP 200 and require no paid license:

The syntax cost is low: two of the five speak plain JSON over GET with no key, and the rest need only a free registration.

How do you enrich a company without a paid API?

Company enrichment is a join across 2-3 registries keyed on name, then number — and the whole flow is 3 HTTP requests. We run this pattern in our company-360 chain, which joins 38 open sources; the minimal manual version:

• Resolve the name: SEC full-text search (efts.sec.gov) for US filers, Companies House search for UK — both return the registry identifier (CIK or company number).
• Fetch the profile: data.sec.gov/submissions/CIK{cik}.json or /company/{number} — status, industry code, address, tickers.
• Follow the ownership edge: /persons-with-significant-control for UK beneficial owners, Form D for US funding history.

curl -u "CH_API_KEY:" \
  "https://api.company-information.service.gov.uk/company/{number}/officers"

Each hop returns a join key for the next, so the chain extends to property, trademarks, and hiring signals without ever leaving official sources. When the chain crosses a border, the GLEIF LEI register resolves entities between national registries through one global identifier.

What can't open data replace?

Contact-level enrichment — and pretending otherwise is how vendors get sued. Registries name directors and beneficial owners, but they do not publish work emails, phone numbers, or org charts below the officer level; that layer comes from commercial data with its own consent chain. In our data, the honest split is: firmographics, ownership, filings, and funding signals move to open sources at zero license cost, while person-level contact discovery stays a paid or first-party function. Two more gaps worth naming: intent data has no open-data equivalent at all, and open registries publish on filing schedules — an acquisition shows up when the paperwork lands, not when the press release does. Treat open data as the verified skeleton and commercial layers as optional flesh, not the other way around.

Test page. Source facts from the Aidenix Atlas catalog, probed 2026-07-24. Not yet editorially reviewed.