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Chess.com vs PotterDB

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

APIChess.comNEW—PotterDBNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (data derived from Harry Potter Fandom, CC BY-SA)
Free tierFree — no API keyFree — no key
Rate limitSerial requests expected; no fixed cap publishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Chess.com vs PotterDB: common questions

Which is more reliable, Chess.com or PotterDB?

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

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

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

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

Chess.com has unclear commercial terms, and PotterDB 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.