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PostStack vs Namedays Calendar

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

APIPostStackUNMONITORED—Namedays CalendarNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
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 Namedays Calendar: common questions

Which is more reliable, PostStack or Namedays Calendar?

Only Namedays Calendar is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do PostStack and Namedays Calendar need an API key?

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

Can I call PostStack and Namedays Calendar from the browser?

Only Namedays Calendar 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 Namedays Calendar free for commercial use?

PostStack has unclear commercial terms, and Namedays Calendar 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.