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SLA Uptime Calculator vs Todoist

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

APISLA Uptime CalculatorNEW—TodoistNEW—
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 — API key required
Rate limitUnpublishedRetry-After: 2s
In directory since2026-07-052026-07-05
operationalpartialdownno data

SLA Uptime Calculator vs Todoist: common questions

Which is more reliable, SLA Uptime Calculator or Todoist?

On our scheduled checks, Todoist leads on measured uptime — SLA Uptime Calculator at —% versus Todoist 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 SLA Uptime Calculator and Todoist need an API key?

SLA Uptime Calculator needs no key, while Todoist requires a free API key. If you want to start calling without signup, reach for SLA Uptime Calculator first.

Can I call SLA Uptime Calculator and Todoist from the browser?

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

Are SLA Uptime Calculator and Todoist free for commercial use?

SLA Uptime Calculator has unclear commercial terms, and Todoist 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.