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CustomGPT.ai vs Free Dictionary API

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

APICustomGPT.aiNEW—Free Dictionary APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

CustomGPT.ai vs Free Dictionary API: common questions

Which is more reliable, CustomGPT.ai or Free Dictionary API?

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

Free Dictionary API needs no key, while CustomGPT.ai requires a free API key. If you want to start calling without signup, reach for Free Dictionary API first.

Can I call CustomGPT.ai and Free Dictionary API from the browser?

Yes — both CustomGPT.ai and Free Dictionary 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 CustomGPT.ai and Free Dictionary API free for commercial use?

CustomGPT.ai has unclear commercial terms, and Free Dictionary 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.