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Datamuse vs Photon API

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

APIDatamuseNEW—Photon APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Datamuse vs Photon API: common questions

Which is more reliable, Datamuse or Photon API?

On our scheduled checks, Photon API leads on measured uptime — Datamuse at —% versus Photon API 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 Datamuse and Photon API need an API key?

Neither needs a paid key — Datamuse is callable with no signup, and Photon API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Datamuse and Photon API from the browser?

Yes — both Datamuse and Photon API send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Datamuse and Photon API free for commercial use?

Datamuse has unclear commercial terms, and Photon API 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.