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Tumblr vs The Calendar

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

APITumblrON SCHEDULE—The CalendarNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authoauthnone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (US federal list per 5 U.S.C. § 6103)
Free tierOAuth — some read routes may be publicFree, no auth (per site)
Rate limitUnpublishedNone stated (site advertises no rate limit)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Tumblr vs The Calendar: common questions

Which is more reliable, Tumblr or The Calendar?

Only The Calendar is on our probe schedule so far (—% uptime over 90 days). The other is catalogued but not yet live-checked, so we can't compare measured reliability head-to-head — check the uncovered API's own status page for now.

Do Tumblr and The Calendar need an API key?

The Calendar needs no key, while Tumblr requires OAuth. If you want to start calling without signup, reach for The Calendar first.

Can I call Tumblr and The Calendar from the browser?

Yes — both Tumblr and The Calendar send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Tumblr and The Calendar free for commercial use?

Tumblr has unclear commercial terms, and The 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.