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Nightbell vs Website Monitor: catalog facts
Nightbell	Website Monitor
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the GPL-3.0 licence.
Android	Android
No server or account needed Tokens and history stay on the device	Supports per-site monitoring intervals Can notify for selected HTTP status codes
Checks only run while the phone is on and connected Not available on Google Play	Available for Android only
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0
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 8, 2026

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