UptimeRobot 
Pingdom 
StatusCake About Oh Dear
Oh Dear is a Belgian website monitoring service founded in 2018 by Freek Van der Herten and Mattias Geniar. Every plan bundles all checks - uptime, SSL certificate validity, broken links, DNS, performance, scheduled tasks, domain expiry, ping and TCP ports - with unlimited users and notifications; plans differ only by site count. It also hosts public status pages and integrates with Slack, Teams, Discord, PagerDuty and webhooks. Pricing starts at 15 EUR/month with a 10-day free trial.
Quick facts
Pricing model
Paid
Free trial
—
Open source
—
Self-hostable
No
Public API
No
Target audience
B2B
Company size fit
All
DPA available
Yes
Data stored in EU
Yes
