OneUptime
Open-source monitoring, status pages and on-call paging, from $1 per monitor a month
OneUptime monitors your stack from the outside (checks as often as every 10 seconds), pages the on-call person by phone with automatic escalation if they don't answer, updates your status page, and can open a fix PR via an AI agent. It's open source with 7.7k+ stars and can be self-hosted, with a free-forever plan and paid monitors at $1 each per month. Synthetic tests simulate real user flows rather than just checking if a server responds, and SSL certificate expiry is tracked weeks ahead.
What holds up
- +Open source with self-hosting available — not locked to their cloud
- +$1 per active monitor/month, with unlimited manual monitors free
- +Pages the on-call person by phone and auto-escalates to a backup if there's no answer
- +Synthetic checks simulate real flows like checkout, not just a server ping
Mind the limits
- −Free plan only covers manual monitors — scheduled automated checks cost $1 each per month
- −$1/monitor adds up at scale — a 247-monitor stack like the demo's would run about $247/month
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