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 $10 per month (indicative, Synthetic starter)
PaidFrom $7 per month (indicative, Solo)
Free tierWhat drives the bill
The metric that actually scales your invoice.
Transaction checks and RUM are priced separately from basic uptime checks and add up.
One of the best free tiers in infrastructure tooling; paid plans are still inexpensive.
Free tier
30-day trial.
50 monitors at 5-minute intervals, free forever.
Open source
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
SolarWinds · since 2007
Widely used
UptimeRobot · since 2010
Strengths
Limitations
Best for
Organisations wanting an established name for straightforward uptime monitoring.
Side projects, small businesses and anyone who currently has no monitoring at all.
All of these integrate with: Slack, PagerDuty, Webhooks.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.