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Website Monitor vs Updo: catalog facts
Website Monitor	Updo
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the MIT license.
Android	Windows, macOS, Linux, Command line
Supports per-site monitoring intervals Can notify for selected HTTP status codes	Provides website monitoring from the command line Supports alerting and advanced settings
Available for Android only	Requires command-line use
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
No account needed	Not stated if an account is 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 8, 2026

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