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 tierFrom $10 per month (indicative, Synthetic starter)
PaidWhat drives the bill
The metric that actually scales your invoice.
One of the best free tiers in infrastructure tooling; paid plans are still inexpensive.
Transaction checks and RUM are priced separately from basic uptime checks and add up.
Free tier
50 monitors at 5-minute intervals, free forever.
30-day trial.
Open source
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
UptimeRobot · since 2010
Widely used
SolarWinds · since 2007
Strengths
Limitations
Best for
Side projects, small businesses and anyone who currently has no monitoring at all.
Organisations wanting an established name for straightforward uptime monitoring.
All of these integrate with: Slack, PagerDuty, Webhooks.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.