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Kanji API vs Wolne Lektury

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

APIKanji APINEW—Wolne LekturyNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedWorks are public domain or on free/Creative Commons licenses (per WolneLektury); API terms not formally stated
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Kanji API vs Wolne Lektury: common questions

Which is more reliable, Kanji API or Wolne Lektury?

On our scheduled checks, Wolne Lektury leads on measured uptime — Kanji API at —% versus Wolne Lektury 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 Kanji API and Wolne Lektury need an API key?

Neither needs a paid key — Kanji API is callable with no signup, and Wolne Lektury is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Kanji API and Wolne Lektury from the browser?

Yes — both Kanji API and Wolne Lektury 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 Kanji API and Wolne Lektury free for commercial use?

Kanji API has unclear commercial terms, and Wolne Lektury 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.