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Cert Spotter vs crt.sh: catalog facts
Cert Spotter	crt.sh
Paid Paid monitoring service with a 30-day free trial.	Free Free to use.
Web	Web
Alerts on any newly issued certificate for your domains via Certificate Transparency logs Catches expired, revoked and misinstalled certificates	Search by domain, organization or fingerprint Shows certificates from public CT logs
Paid after the 30-day trial Hosted service only	Minimal interface aimed at technical users Only covers certificates that were logged
Web application, Hosted service	Web application
Closed source	Closed source
License not stated	License not stated
Account needed	No 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.