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Nager.Date vs PostStack

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

APINager.DateHEALTHY100PostStackHEALTHY87
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms581066
P95 · ms5531890
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree, no keyFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Nager.Date vs PostStack: common questions

Which is more reliable, Nager.Date or PostStack?

Both are neck-and-neck — Nager.Date and PostStack 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, Nager.Date or PostStack?

Nager.Date has the lower median latency in our checks — Nager.Date responds in 58 ms versus PostStack at 1066 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 Nager.Date and PostStack need an API key?

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

Can I call Nager.Date and PostStack from the browser?

Only Nager.Date 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 Nager.Date and PostStack free for commercial use?

Nager.Date has unclear commercial terms, and PostStack 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.