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 check it once from every probe region: status, time, TLS and IP per region, with a shareable link.
Cron job monitor
Get a heartbeat ping URL for a cron job with no signup, and see every run check in.
SLA / uptime calculator
Enter an uptime target and see the downtime it allows, plus your SLO error budget and burn rate.
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.
Health check endpoint tester
Enter your /healthz URL and get its status code, speed, body and cache headers graded, with what to fix.
DNS propagation checker
Look up a DNS record from every probe region and see which regions still give the old answer.
Ping from multiple locations
Round-trip time and loss to a host from every probe region, with a shareable result link.
TTFB test
DNS, connect, TLS and time to first byte for a URL, region by region.
On-call schedule generator
Build a daily or weekly on-call rotation in your time zone and download it as iCal or CSV.
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.
Statuspage pricing calculator
Enter subscribers and team members and see which published Atlassian Statuspage plan covers it, next to RealUptime Status.
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 195 popular services we already watch, or start monitoring your own site.