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PostStack vs Public Time API

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

APIPostStackNEW—Public Time APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PostStack vs Public Time API: common questions

Which is more reliable, PostStack or Public Time API?

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

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

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

Neither sends browser-friendly CORS headers reliably, so call PostStack and Public Time API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are PostStack and Public Time API free for commercial use?

PostStack has unclear commercial terms, and Public Time API 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.