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