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serpstack vs Todoist

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

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

serpstack vs Todoist: common questions

Which is more reliable, serpstack or Todoist?

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

Both ask you to authenticate — serpstack 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 serpstack and Todoist from the browser?

Neither sends browser-friendly CORS headers reliably, so call serpstack and Todoist from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are serpstack and Todoist free for commercial use?

serpstack 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.