Lichess vs Zelda
Same instrument, two spec sheets — measured, not claimed.
Lichess vs Zelda: common questions
Which is more reliable, Lichess or Zelda?
On our scheduled checks, Zelda leads on measured uptime — Lichess at —% versus Zelda 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 Lichess and Zelda need an API key?
Neither needs a paid key — Lichess is callable with no signup, and Zelda is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Lichess and Zelda from the browser?
Yes — both Lichess and Zelda 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 Lichess and Zelda free for commercial use?
Lichess has unclear commercial terms, and Zelda 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.