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mailboxlayer vs TimeZones iCal Library

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

APImailboxlayerNEW—TimeZones iCal LibraryNEW—
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

mailboxlayer vs TimeZones iCal Library: common questions

Which is more reliable, mailboxlayer or TimeZones iCal Library?

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

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

Can I call mailboxlayer and TimeZones iCal Library from the browser?

Only TimeZones iCal Library 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 mailboxlayer and TimeZones iCal Library free for commercial use?

mailboxlayer has unclear commercial terms, and TimeZones iCal Library 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.