Mobile app · Development

Nightbell

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

Completely free
Android
Open source
No account

Ad-supported exit link (Clictune): an intermediate page may show for a few seconds before the official website. Direct link to the website, no intermediate page

Download from the official source

Link to the official download page, ad-supported (Clictune): an intermediate page may show for a few seconds. Direct link to the download

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by GitHub, F-Droid
License: Apache-2.0 — Open source (permissive)confirmed by GitHub, F-Droid
Open source: Yes
Commercial use: Yesconfirmed by GitHub, F-Droid
Account required: Noconfirmed by GitHub
Credit card required: Noconfirmed by GitHub, F-Droid
Watermark: Not applicable
Ads: No
Platforms: AndroidEstablished by Android: F-Droid, GitHub
Publisher: river
Latest version: 3.21.0 (9 November 2026)
Latest activity: 9 November 2026
Source code: github.com/riveerxd/nightbell

Overview

Features described on its official website: self-hosting on your own server.

Services and protocols mentioned: IMAP.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Hosted, self-hosted, or the phone in your pocket.” — official website, 10 November 2026

At a glance

Nightbell is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (Apache-2.0) is a permissive open source licence: use, modification and redistribution are allowed, including in commercial projects.

Strengths

Open source code
No account needed
No advertising
Commercial use allowed

Sources and checks

Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) — 10 November 2026
Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 9 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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