PostStack vs TimeZones iCal Library

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

Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1066337
P95 · ms1890714
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 TimeZones iCal Library: common questions

Which is more reliable, PostStack or TimeZones iCal Library?

Both are neck-and-neck — PostStack and TimeZones iCal Library 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 TimeZones iCal Library?

TimeZones iCal Library has the lower median latency in our checks — PostStack responds in 1066 ms versus TimeZones iCal Library at 337 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 TimeZones iCal Library need an API key?

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

Can I call PostStack and TimeZones iCal Library from the browser?

Only TimeZones iCal Library 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 TimeZones iCal Library free for commercial use?

PostStack has unclear commercial terms, and TimeZones iCal Library 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.