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

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