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PostStack vs TimeAPI.io

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

APIPostStackHEALTHY87TimeAPI.ioHEALTHY87
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms10661040
P95 · ms18903967
AuthapiKeynone
CORSnoyes
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 TimeAPI.io: common questions

Which is more reliable, PostStack or TimeAPI.io?

Both are neck-and-neck — PostStack and TimeAPI.io each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, PostStack or TimeAPI.io?

TimeAPI.io has the lower median latency in our checks — PostStack responds in 1066 ms versus TimeAPI.io at 1040 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do PostStack and TimeAPI.io need an API key?

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

Can I call PostStack and TimeAPI.io from the browser?

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

Are PostStack and TimeAPI.io free for commercial use?

PostStack has unclear commercial terms, and TimeAPI.io 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.