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mailboxlayer vs Tumblr

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

APImailboxlayerHEALTHY96TumblrREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms316208
P95 · ms26341101
AuthapiKeyoauth
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredOAuth — some read routes may be public
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

mailboxlayer vs Tumblr: common questions

Which is more reliable, mailboxlayer or Tumblr?

Both are neck-and-neck — mailboxlayer and Tumblr each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, mailboxlayer or Tumblr?

Tumblr has the lower median latency in our checks — mailboxlayer responds in 316 ms versus Tumblr at 208 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do mailboxlayer and Tumblr need an API key?

Both ask you to authenticate — mailboxlayer uses an API key and Tumblr uses OAuth. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call mailboxlayer and Tumblr from the browser?

Only Tumblr 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 Tumblr free for commercial use?

mailboxlayer has unclear commercial terms, and Tumblr 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.