Nightbell is a free, open-source Android Tools app. The latest version is 3.0.5, it is 2.1 MB, requires Android 8.0+, and is published by Lukas Hrehor.
- Size
- 2.1 MB
- Requires
- Android 8.0+
- Last updated
- 29 days ago25 Aug 2026
- Safety
- Scanned25 Aug 2026what does this mean?
License: Apache-2.0
About this app
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. Three kinds of monitor: - Status check: hit a URL, assert on the status code.
Screenshots
Permissions13 requested
What version 3.0.5 is allowed to do once installed. Highlighted entries reach outside the app’s own sandbox and are worth a second look. Not sure what a permission actually means? Learn how to evaluate app permissions.
Access Network State
See whether you are online and on which type of network.
android.permission.ACCESS_NETWORK_STATE
Access Notification Policy
No description available for this permission.
android.permission.ACCESS_NOTIFICATION_POLICY
Dynamic Receiver Not Exported Permission
No description available for this permission.
me.river.nightbell.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Foreground Service
Keep running in the background with a visible notification.
android.permission.FOREGROUND_SERVICE
Foreground Service Special Use
No description available for this permission.
android.permission.FOREGROUND_SERVICE_SPECIAL_USE
Internet
Send and receive data over the internet.
android.permission.INTERNET
Post Notifications
Show notifications.
android.permission.POST_NOTIFICATIONS
Post Promoted Notifications
No description available for this permission.
android.permission.POST_PROMOTED_NOTIFICATIONS
Receive Boot Completed
No description available for this permission.
android.permission.RECEIVE_BOOT_COMPLETED
Request Ignore Battery Optimizations
No description available for this permission.
android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS
Use Full Screen Intent
No description available for this permission.
android.permission.USE_FULL_SCREEN_INTENT
Vibrate
Use the vibration motor.
android.permission.VIBRATE
Wake Lock
Keep the device awake while working in the background.
android.permission.WAKE_LOCK
Version history1 published build
- v3.0.5Latestbuild 27Scanned
- Released
- 25 Aug 2026
- Size
- 2.1 MB
- Requires
- Android 8.0+
3.0.5 Answers a security review of 3.0.4 on the F-Droid merge request. The verdict was pass with recommendations, so nothing here was a defect, but three of the four were worth doing. The cleartext policy moved out of the manifest into res/xml/network_security_config.xml. It still permits cleartext, because a lot of what people monitor has no certificate and never will: a NAS on a LAN address, a container on a homelab box, a printer. What changed is that the policy is now a file you can read a
Download v3.0.513 permissions
Access Network State
See whether you are online and on which type of network.
android.permission.ACCESS_NETWORK_STATE
Access Notification Policy
No description available for this permission.
android.permission.ACCESS_NOTIFICATION_POLICY
Dynamic Receiver Not Exported Permission
No description available for this permission.
me.river.nightbell.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Foreground Service
Keep running in the background with a visible notification.
android.permission.FOREGROUND_SERVICE
Foreground Service Special Use
No description available for this permission.
android.permission.FOREGROUND_SERVICE_SPECIAL_USE
Internet
Send and receive data over the internet.
android.permission.INTERNET
Post Notifications
Show notifications.
android.permission.POST_NOTIFICATIONS
Post Promoted Notifications
No description available for this permission.
android.permission.POST_PROMOTED_NOTIFICATIONS
Receive Boot Completed
No description available for this permission.
android.permission.RECEIVE_BOOT_COMPLETED
Request Ignore Battery Optimizations
No description available for this permission.
android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS
Use Full Screen Intent
No description available for this permission.
android.permission.USE_FULL_SCREEN_INTENT
Vibrate
Use the vibration motor.
android.permission.VIBRATE
Wake Lock
Keep the device awake while working in the background.
android.permission.WAKE_LOCK
New to sideloading? Read the install guide before opening an APK. Not sure this build supports your phone? See how to check your device’s Android version.
Read our guide to the best open-source Tools apps for Android
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