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Free Dictionary vs Wiktionary

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

APIFree DictionaryNEW—WiktionaryNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseContent under source licenses (CC BY-SA 4.0 seen on entries)Content under CC BY-SA 4.0 / GFDL
Free tierFree — limits not publishedFree — public MediaWiki action API
Rate limit450 req/window · 417 remaining · resets 1783512354No hard published cap; Wikimedia User-Agent policy and request-etiquette apply
In directory since2026-07-052026-07-05
operationalpartialdownno data

Free Dictionary vs Wiktionary: common questions

Which is more reliable, Free Dictionary or Wiktionary?

On our scheduled checks, Wiktionary leads on measured uptime — Free Dictionary at —% versus Wiktionary 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 Free Dictionary and Wiktionary need an API key?

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

Can I call Free Dictionary and Wiktionary from the browser?

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

Are Free Dictionary and Wiktionary free for commercial use?

Free Dictionary has unclear commercial terms, and Wiktionary 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.