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Hebrew Calendar vs mailboxlayer

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

APIHebrew CalendarNEW—mailboxlayerNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
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

Hebrew Calendar vs mailboxlayer: common questions

Which is more reliable, Hebrew Calendar or mailboxlayer?

On our scheduled checks, mailboxlayer leads on measured uptime — Hebrew 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 Hebrew Calendar and mailboxlayer need an API key?

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

Can I call Hebrew Calendar and mailboxlayer from the browser?

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

Are Hebrew Calendar and mailboxlayer free for commercial use?

Hebrew 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.