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UptimeRobot
Most popular free uptime monitor — 50 free monitors at 5-min intervals.
Free tier: 50 monitors, 5-min checks
What it does well
- Extremely generous free tier with 50 monitors and 5-minute check intervals.
- Simple, intuitive interface that is very fast to set up and use.
- Offers public status pages, even on the free plan, to communicate with users.
Where it falls short
- The free plan is limited to 5-minute check intervals; 1-minute checks require payment.
- Lacks advanced performance metrics and root-cause analysis tools found in other platforms.
- Alerting integrations on the free tier are limited, with many (like SMS) costing credits.
Alternatives to UptimeRobot
StatusCake
freemiumLong-running freemium uptime tool — uptime + SSL + domain expiry in one dashboard.
Uptime Kuma
freeSelf-hosted open-source uptime monitor with status pages — Docker one-liner deploy.
Freshping
freemiumFreshworks' uptime monitor — generous always-free tier with 1-min intervals.
Updown.io
paidPay-per-check uptime — load €5 credit, get ~50000 checks. Solo-founder favorite.