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updown.io vs Oh Dear: catalog facts
updown.io	Oh Dear
Paid Pay-per-use pricing that scales linearly with check frequency; cards, PayPal, SEPA and…	Paid Paid plans with a 10-day free trial that needs no payment details.
Web	Web
Check interval adjustable from 15 seconds to 1 hour Downtime confirmed from two locations before alerting	Crawls whole sites for broken links, not just the homepage Uptime, SSL, DNS and cron checks in one tool
No free tier mentioned Hosted only, with no self-hosted option	No permanent free plan Hosted only
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.