You jot a meeting note in the morning, tick off a habit at lunch and check a deadline on the calendar before bed, all without a connection. Flux, from developer Ronit Chinda, is built for that kind of day. It is an open-source productivity app for Android 10 and newer, and this page covers version 3.2.5.
Free, no ads, and GPL-3.0 source code
Flux is free and has no ads, so there is no ad-supported tier to worry about.
The code is published under the GPL-3.0-only license, with the repository hosted on GitHub under chindaronit/Flux. Anyone can read how the app works or check what it does.
Markdown notes, workspaces, habits and a calendar
The editor is a rich Markdown one, so notes can carry formatting. Customizable workspaces let you sort notes and tasks into separate areas instead of one long list.
Task management sits alongside a habit tracker that shows productivity insights. A calendar and events section handles schedules and important dates. The design follows Material You, built on Material 3, and the app works offline first.
Its tags include calendar-and-agenda, note and task, which fits that mix.
Version 3.2.5 and how recently it was updated
Flux is at version 3.2.5, updated on October 29, 2026. It first appeared on August 13, 2025, so it has been maintained for over a year. The package ID is com.flux and the APK is 13.4 MB.
Flux pros and cons
Pros
- Free, with no ads listed
- Open source under GPL-3.0-only, with code on GitHub
- Offline-first, so it does not depend on a connection
- Notes, tasks, habits and calendar in one 13.4 MB app
- Updated on October 29, 2026
Cons
- Requires Android 10 or newer
- Version 3.2.5 is the current release
- No Google Play rating or install count
Is Flux safe?
The Flux APK we keep is the unmodified file, matching what Ronit Chinda published. After downloading, compare its SHA-256 checksum with this value: 6c4289089dba1153b505453e3a4940505f6e56f901be6882e563d0b94495e05f. The source for the notes, tasks and calendar is public on GitHub under GPL-3.0-only, so anyone can read it. Because Flux is built offline-first, the permission prompt at install time is worth a quick look.
How to install Flux
- Download the APK with the button on this page and wait for it to finish.
- Compare the file with the SHA-256 checksum shown here if you want to confirm it arrived intact.
- Open the file on your phone and allow installs from this source when Android asks.
- Finish the install, then open Flux from your app drawer.
