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Gutendex vs Wizard World

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

APIGutendexNEW—Wizard WorldNEW—
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 — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Gutendex vs Wizard World: common questions

Which is more reliable, Gutendex or Wizard World?

On our scheduled checks, Wizard World leads on measured uptime — Gutendex at —% versus Wizard World 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 Wizard World need an API key?

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

Can I call Gutendex and Wizard World from the browser?

Yes — both Gutendex and Wizard World 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 Wizard World free for commercial use?

Gutendex has unclear commercial terms, and Wizard World 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.