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Free Dictionary API vs Wikipedia REST

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

APIFree Dictionary APIUNMONITORED—Wikipedia RESTHEALTHY—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedCC BY-SA 4.0
Free tierFree — limits not publishedUnlimited within etiquette
Rate limitUnpublished200/sec global courtesy cap
In directory since2026-07-052026-05-09
operationalpartialdownno data

Free Dictionary API vs Wikipedia REST: common questions

Which is more reliable, Free Dictionary API or Wikipedia REST?

Only Wikipedia REST is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Free Dictionary API and Wikipedia REST need an API key?

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

Can I call Free Dictionary API and Wikipedia REST from the browser?

Yes — both Free Dictionary API and Wikipedia REST 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 Free Dictionary API and Wikipedia REST free for commercial use?

Free Dictionary API has unclear commercial terms, and Wikipedia REST allows commercial use on its free tier. 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.