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Gutendex vs Quran-api

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

APIGutendexNEW—Quran-apiNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licensePublic domain (Project Gutenberg data)Unverified
Free tierFree, no keyFree, no key (static CDN JSON files)
Rate limitUnpublishedNone (served as static files from jsDelivr CDN)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Gutendex vs Quran-api: common questions

Which is more reliable, Gutendex or Quran-api?

On our scheduled checks, Quran-api leads on measured uptime — Gutendex at —% versus Quran-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 Gutendex and Quran-api need an API key?

Neither needs a paid key — Gutendex is callable with no signup, and Quran-api is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Gutendex and Quran-api from the browser?

Yes — both Gutendex and Quran-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 Gutendex and Quran-api free for commercial use?

Gutendex has unclear commercial terms, and Quran-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.