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