- https://www.site24x7.com $9 for 10 monitors
- https://www.pingdom.com $11 for 10 checks
- https://www.statuscake.com, free plan with unclear limits, $25 for 50 tests
- https://uptimerobot.com, free plan 50 checks, additional 50 checks for $4.5 (decreases with scale)
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