Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
From $7 per month (indicative, Solo)
Free tierFree tier available
Free tierWhat drives the bill
The metric that actually scales your invoice.
One of the best free tiers in infrastructure tooling; paid plans are still inexpensive.
The free tier is genuinely usable. Costs come from full-platform user seats rather than check volume.
Free tier
50 monitors at 5-minute intervals, free forever.
100 GB of data ingest and one full-platform user free every month, permanently.
Open source
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
UptimeRobot · since 2010
Widely used
New Relic · since 2015
Strengths
Limitations
Best for
Side projects, small businesses and anyone who currently has no monitoring at all.
Teams wanting an observability platform with monitoring included and a real free tier.
All of these integrate with: Slack, PagerDuty.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.