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updown.io vs UptimeRobot: catalog facts
updown.io	UptimeRobot
Paid Pay-per-use pricing that scales linearly with check frequency; cards, PayPal, SEPA and…	Freemium Free plan with 50 monitors; paid plans add more features.
Web	Web
Check interval adjustable from 15 seconds to 1 hour Downtime confirmed from two locations before alerting	50 monitors on the free plan Wide range of check types, including ports and cron jobs
No free tier mentioned Hosted only, with no self-hosted option	Hosted only Some features such as multi-location checks may need a paid plan
Hosted service	Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Account needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.