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mail.tm vs Slack

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

APImail.tmNEW—SlackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — temporary mailboxesFree tier — API key required
Rate limitRate limited (429 on exceed); exact policy per docs.mail.tmUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

mail.tm vs Slack: common questions

Which is more reliable, mail.tm or Slack?

On our scheduled checks, Slack leads on measured uptime — mail.tm at —% versus Slack 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 mail.tm and Slack need an API key?

mail.tm needs no key, while Slack requires a free API key. If you want to start calling without signup, reach for mail.tm first.

Can I call mail.tm and Slack from the browser?

Yes — both mail.tm and Slack 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 mail.tm and Slack free for commercial use?

mail.tm has unclear commercial terms, and Slack 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.