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Rendex vs Todoist

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

APIRendexNEW—TodoistNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedRetry-After: 2s
In directory since2026-07-052026-07-05
operationalpartialdownno data

Rendex vs Todoist: common questions

Which is more reliable, Rendex or Todoist?

On our scheduled checks, Todoist leads on measured uptime — Rendex 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 Rendex and Todoist need an API key?

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

Can I call Rendex and Todoist from the browser?

Only Rendex 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 Rendex and Todoist free for commercial use?

Rendex 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.