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CompanyData.com vs Tax Data

Same instrument, two spec sheets — measured, not claimed.

APICompanyData.comNEW—Tax DataNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CompanyData.com vs Tax Data: common questions

Which is more reliable, CompanyData.com or Tax Data?

On our scheduled checks, Tax Data leads on measured uptime — CompanyData.com at —% versus Tax Data at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do CompanyData.com and Tax Data need an API key?

CompanyData.com needs no key, while Tax Data requires a free API key. If you want to start calling without signup, reach for CompanyData.com first.

Can I call CompanyData.com and Tax Data from the browser?

Only Tax Data is browser-friendly — it returns CORS headers over HTTPS. CompanyData.com needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are CompanyData.com and Tax Data free for commercial use?

CompanyData.com has unclear commercial terms, and Tax Data has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.