Free tools
Free tools, no signup
Small, honest tools: some run the same probe fleet and certificate checks RealUptime runs for paying customers, others are the exact math behind an SLA or a downtime budget. No account required, and each one shows exactly what it checked or computed and how.
Is my website down?
Enter a URL and get a live status code and response time from a real check, right now.
SLA / uptime calculator
Enter an uptime target and see exactly how much downtime it allows per month and year.
Downtime cost calculator
Estimate what a given amount of downtime costs, using your own monthly revenue.
SSL certificate checker
Enter a hostname and see its certificate's expiry date, issuer, and days remaining.
Metered pricing cost calculator
Compare Statuspage's published per-subscriber pricing to RealUptime's flat rate for your numbers.
Status page grader
Paste any status page URL and get a free report card on regional visibility and incident history.
Sentry pricing calculator
Enter your monthly error volume and see which published Sentry plan covers it, next to our flat rate.
Why these are free
The checker, certificate, and grader tools run a single, one-off check, the kind of thing you might otherwise do with curl or a browser; the calculators are just the arithmetic behind an SLA target or a downtime budget, shown in full. Either way, they’re here because they cost little to expose publicly and stay honest about what they do and don’t know. If you need a real check running continuously, with alerts, that’s RealUptime’s actual product: see our outage tracker for 190 popular services we already watch, or start monitoring your own site.