
Dotcom-Monitor
8.3#1 in website monitoring softwareFrom $13.33 a monthFree planAndroidiOSWebAPI
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Dotcom-Monitor suits teams that need website or server monitoring, keyword checks, or SSL expiry alerts across multiple targets. Its free plan is an option for those who can work within its listed target, location, alert, and retention limits; larger monitoring needs can look at subscription or enterprise plans.
Uptime Cairn suits people who self-host, keep monitoring data on their own infrastructure, or need a write API and branded status pages. It is available through API, Linux, self-hosted, and web contexts.