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Church Calendar vs mailboxlayer

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

APIChurch CalendarNEW—mailboxlayerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Church Calendar vs mailboxlayer: common questions

Which is more reliable, Church Calendar or mailboxlayer?

On our scheduled checks, mailboxlayer leads on measured uptime — Church Calendar at —% versus mailboxlayer at —% 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 Church Calendar and mailboxlayer need an API key?

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

Can I call Church Calendar and mailboxlayer from the browser?

Neither sends browser-friendly CORS headers reliably, so call Church Calendar and mailboxlayer from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Church Calendar and mailboxlayer free for commercial use?

Church Calendar has unclear commercial terms, and mailboxlayer 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.