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
Free tier available
Free tierFrom $7 per month (indicative, Solo)
Free tierWhat drives the bill
The metric that actually scales your invoice.
Cheap if you already run Grafana Cloud; results are plain Prometheus metrics you already know how to use.
One of the best free tiers in infrastructure tooling; paid plans are still inexpensive.
Free tier
Included in the Grafana Cloud free tier with a monthly check allowance.
50 monitors at 5-minute intervals, free forever.
Open source
Apache-2.0 (agent)
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Established
Grafana Labs · since 2021
Widely used
UptimeRobot · since 2010
Strengths
Limitations
Best for
Teams already running Grafana Cloud and k6.
Side projects, small businesses and anyone who currently has no monitoring at all.
All of these integrate with: PagerDuty, Slack.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.