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Cert Spotter vs updown.io: catalog facts
Cert Spotter	updown.io
Paid Paid monitoring service with a 30-day free trial.	Paid Pay-per-use pricing that scales linearly with check frequency; cards, PayPal, SEPA and…
Web	Web
Alerts on any newly issued certificate for your domains via Certificate Transparency logs Catches expired, revoked and misinstalled certificates	Check interval adjustable from 15 seconds to 1 hour Downtime confirmed from two locations before alerting
Paid after the 30-day trial Hosted service only	No free tier mentioned Hosted only, with no self-hosted option
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.