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Nightbell

Name: Nightbell
Author: river

river

Uptime monitoring that runs on your phone. No server, no account.

System & tools
FOSS
Free
No ads
No tracking

Android only

Get Nightbell

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What are these stores? F-Droid, GitHub, Zapstore

Point Nightbell at anything that answers over HTTP, or at one element on a rendered web page, and it watches it, charts it, and gets loud when it breaks. There is no server and no account. The phone in your pocket does the checking, and your API tokens and target URLs never leave the device.

Developer: river
Website: nightbell.app
Source code: github.com/riveerxd/nightbell
Added to AppCosmos: 10 October 2026
License: Apache-2.0