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Monitoring
Know when something breaks before your users tell you.
Better Stack
Started as uptime monitoring and grew into a full observability platform (incidents, status pages, on-call, logs). A good one-stop shop if you don't want five separate monitoring bills.
Checkly
Synthetic monitoring where your checks are actual TypeScript/Playwright code living in your repo, not a point-and-click config screen.
Pingdom
One of the oldest names in uptime and page-speed monitoring. Solid if you want a battle-tested tool, though the free tier is gone now.
Sentry
The standard for error tracking. Groups errors by stack trace, links back to the exact commit and line, and now covers performance and session replay too.
UptimeRobot
The cheapest, simplest way to know when your site goes down. Free tier covers 50 monitors, plenty for a solo project.