Uptime Kuma (self-hosted)

Self-hosted: you run the server. There is no vendor price or plan; each fact below is quoted from the project's own repository.

Source: https://github.com/louislam/uptime-kuma · verified

Key figures

Cost
Self-hostedyou run the server
Licence
MIT
Min check
20 s
Alert channels
4listed

Verified fields

FieldValueQuote from the pricing page
Pricing Self-hosted: you run the server “easy-to-use self-hosted monitoring tool”
Minimum check interval 20 s “20-second intervals”
Has a status page Yes “Multiple status pages”
Alert channels telegram, discord, slack, email “Notifications via Telegram, Discord, Gotify, Slack, Pushover, Email (SMTP), and 90+ notification services”
Licence MIT “MIT license”
Monitor types HTTP(s), TCP “Monitoring uptime for HTTP(s) / TCP / HTTP(s) Keyword / HTTP(s) Json Query”
Cost, as the project states it — not stated plainly enough to verify

Editorial note

Uptime Kuma is a monitoring tool you install and run on your own server, so there is no vendor price to compare. Its README lists the MIT licence and checks as often as every 20 seconds. It monitors HTTP(s) and TCP targets, among other types, and sends alerts through Telegram, Discord, Slack and email. Its status page feature is listed too. Because you host it, the real cost is your own server and the time to keep it updated. The README says nothing about cost, support or an uptime guarantee, so none is claimed here.