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Public Time API vs Telegraph

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

APIPublic Time APINEW—TelegraphNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Public Time API vs Telegraph: common questions

Which is more reliable, Public Time API or Telegraph?

On our scheduled checks, Telegraph leads on measured uptime — Public Time API at —% versus Telegraph 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 Public Time API and Telegraph need an API key?

Public Time API needs no key, while Telegraph requires a free API key. If you want to start calling without signup, reach for Public Time API first.

Can I call Public Time API and Telegraph from the browser?

Only Telegraph is browser-friendly — it returns CORS headers over HTTPS. Public Time API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Public Time API and Telegraph free for commercial use?

Public Time API has unclear commercial terms, and Telegraph 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.