7 Best Free Uptime Monitoring Services Compared

Not every team has budget for monitoring. Here are 7 uptime monitoring services with genuinely useful free tiers, compared honestly.

Quick Comparison

1. Uptime Robot (Best Free Managed Option)

50 monitors at 5-minute intervals. The most popular free monitoring tool for a reason. The free tier covers basic HTTP, ping, port, and keyword monitoring with email and webhook alerts.

Good: Generous monitor count. Reliable. Simple setup. Bad: 5-minute intervals are slow. No status page on free tier. Limited alerting.

2. Freshping (Best 1-Minute Free Checks)

50 URL checks at 1-minute intervals from 10 locations. Better check frequency than Uptime Robot’s free tier, with multi-location checks included.

Good: 1-minute intervals. 10 check locations. Clean UI. Bad: URL checks only (no TCP/DNS). Limited customization.

3. Uptime Kuma (Best Self-Hosted)

Unlimited monitors, 20-second minimum interval. The gold standard for self-hosted monitoring. One Docker command to deploy. 90+ notification integrations.

Good: Completely free. Unlimited monitors. Fast checks. Great notification support. Bad: Single-region only. You manage the infrastructure. No SLA on the monitor itself.

4. Warden (Best Self-Hosted with Multi-Region)

Unlimited monitors, 10-second intervals, multi-region. Open-source like Uptime Kuma but with distributed architecture for multi-region monitoring.

Good: Fastest free checks (10s). Multi-region. Integrated SSL monitoring. Status pages. Bad: More complex setup than Uptime Kuma. Newer project, smaller community.

Join the waitlist for the managed version.

5. Grafana Cloud (Best for Grafana Users)

5 synthetic checks integrated with Grafana dashboards. If you already use Grafana for observability, this adds monitoring without a new tool.

Good: Deep Grafana integration. Multiple probe locations. Bad: Only 5 checks. Requires Grafana knowledge. Not standalone.

6. Cronitor (Best for Cron + Web Monitoring)

5 monitors at 1-minute intervals. Cronitor is primarily a cron job monitor that also does website monitoring. Good for teams that need both.

Good: Multi-region. Combines web and cron monitoring. Good alerts. Bad: Only 5 free monitors. Primarily designed for cron monitoring.

7. Oh Dear (Best for Single-Site Monitoring)

1 site with comprehensive checks. Oh Dear monitors one site for free but does it thoroughly: uptime, SSL, mixed content, broken links, and more.

Good: Deep monitoring of a single site. SSL and link checking included. Bad: Only 1 site. Must upgrade for more.

Which Free Service Should You Use?

For personal projects: Uptime Robot (managed) or Uptime Kuma (self-hosted). Both are mature and reliable.

For production with SLA: Self-host Warden for multi-region monitoring at 10-second intervals. The error budget math demands faster than 5-minute checks.

For dev/staging: Freshping’s 1-minute checks from 10 locations catch deployment issues quickly.

For Grafana shops: Grafana Cloud synthetic monitoring. Keep everything in one platform.

The Real Cost of “Free”

Free monitoring has hidden costs:

• Slow detection: 5 minutes of undetected downtime at $100M/year revenue = $950 per incident
• False positives: Single-region checks generate noise, causing alert fatigue
• Missing features: No SSL monitoring means preventable certificate expiry outages
• Self-hosted overhead: Running and maintaining your own monitoring infrastructure

Calculate your actual exposure with the downtime cost calculator. If the cost of one undetected outage exceeds a year of paid monitoring, the math is clear.

Related tools:

• Uptime Calculator — Understand SLA levels
• Downtime Cost Calculator — Calculate outage costs
• SSL Checker — Check certificate status