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ImprovMX API vs Namedays Calendar

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

APIImprovMX APIDEAD0Namedays CalendarDYING88
Uptime · 30d
Uptime · 90d0.0%91.2%
Uptime · 30d0.0%85.0%
P50 · ms—480
P95 · ms—2749
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limit301 req/window · 300 remaining · resets 178352652060 req/window · 58 remaining
In directory since2026-07-052026-07-05
operationalpartialdownno data

ImprovMX API vs Namedays Calendar: common questions

Which is more reliable, ImprovMX API or Namedays Calendar?

On our scheduled checks, Namedays Calendar leads on measured uptime — ImprovMX API at 0.0% versus Namedays Calendar at 91.2% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do ImprovMX API and Namedays Calendar need an API key?

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

Can I call ImprovMX API and Namedays Calendar from the browser?

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

Are ImprovMX API and Namedays Calendar free for commercial use?

ImprovMX API 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.