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Monika vs Nightbell: catalog facts
Monika	Nightbell
Free Free and open source.	Free Free and open source under the Apache 2.0 licence.
Self-hosted, Command line	Android
Configuration in a single YAML file Alerts on slow responses as well as downtime	No server or account needed Tokens and history stay on the device
Command-line only, with no built-in dashboard You run and keep it online yourself	Checks only run while the phone is on and connected Not available on Google Play
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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