Namedays Calendar vs PostStack
Same instrument, two spec sheets — measured, not claimed.
Namedays Calendar vs PostStack: common questions
Which is more reliable, Namedays Calendar or PostStack?
On our scheduled checks, PostStack leads on measured uptime — Namedays Calendar at 92.1% versus PostStack at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Namedays Calendar or PostStack?
PostStack has the lower median latency in our checks — Namedays Calendar responds in 536 ms versus PostStack at 318 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 Namedays Calendar and PostStack 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 Namedays Calendar and PostStack 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 Namedays Calendar and PostStack free for commercial use?
Namedays Calendar 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.