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Nightbell vs UptimeRobot: catalog facts
Nightbell	UptimeRobot
Free Free and open source under the Apache 2.0 licence.	Freemium Free plan with 50 monitors; paid plans add more features.
Android	Web
No server or account needed Tokens and history stay on the device	50 monitors on the free plan Wide range of check types, including ports and cron jobs
Checks only run while the phone is on and connected Not available on Google Play	Hosted only Some features such as multi-location checks may need a paid plan
Downloadable app	Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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