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Cert Spotter vs Oh Dear: catalog facts
Cert Spotter	Oh Dear
Paid Paid monitoring service with a 30-day free trial.	Paid Paid plans with a 10-day free trial that needs no payment details.
Web	Web
Alerts on any newly issued certificate for your domains via Certificate Transparency logs Catches expired, revoked and misinstalled certificates	Crawls whole sites for broken links, not just the homepage Uptime, SSL, DNS and cron checks in one tool
Paid after the 30-day trial Hosted service only	No permanent free plan Hosted only
Web application, 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.