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Nightbell vs Monika: catalog facts
Nightbell	Monika
Free Free and open source under the Apache 2.0 licence.	Free Free and open source.
Android	Self-hosted, Command line
No server or account needed Tokens and history stay on the device	Configuration in a single YAML file Alerts on slow responses as well as downtime
Checks only run while the phone is on and connected Not available on Google Play	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: Apache-2.0	License not stated
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.