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Chess.com vs Open5e

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

APIChess.comNEW—Open5eNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedSRD content under OGL 1.0a; API/site MIT-licensed
Free tierFree — no API keyFree, no API key required
Rate limitSerial requests expected; no fixed cap publishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chess.com vs Open5e: common questions

Which is more reliable, Chess.com or Open5e?

On our scheduled checks, Open5e leads on measured uptime — Chess.com at —% versus Open5e 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 Chess.com and Open5e need an API key?

Neither needs a paid key — Chess.com is callable with no signup, and Open5e is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Chess.com and Open5e from the browser?

Yes — both Chess.com and Open5e 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 Chess.com and Open5e free for commercial use?

Chess.com has unclear commercial terms, and Open5e 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.