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Updo vs Monika: catalog facts
Updo	Monika
Free Free and open source under the MIT license.	Free Free and open source.
Windows, macOS, Linux, Command line	Self-hosted, Command line
Provides website monitoring from the command line Supports alerting and advanced settings	Configuration in a single YAML file Alerts on slow responses as well as downtime
Requires command-line use	Command-line only, with no built-in dashboard You run and keep it online yourself
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: MIT	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.