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Chess.com vs GDBrowser

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

APIChess.comNEW—GDBrowserNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — no API keyFree — no API key
Rate limitSerial requests expected; no fixed cap published150 req/window · 149 remaining · resets 1783513202
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chess.com vs GDBrowser: common questions

Which is more reliable, Chess.com or GDBrowser?

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

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

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

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

Chess.com has unclear commercial terms, and GDBrowser 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.