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Android FOSS Apps List 2025

Update: 11 May 2025 - 12:18 PM UTC

Table of Contents


Introduction

This is a list of open source applications for Android, as always, the list is written in a KISS simple way, the apps in the list are divided by category. Feel free to contact me to add applications or modify the list.

Application links in the list are related to one of these resources:

  • The App/Project Website
  • The App’s source code website/page (git repositories such as GitHub, Codebase etc.)
  • The repository page on F-Droid

If in addition to these sources I’m having trouble finding the source code, I do not list the Application. See: - Some little rules of the list

F-Droid Applications

Search the Applications

You can use different methods to search for Applications in the F-Droid repositories:

Repositories

Here you will find a complete list of repositories supported by F-Droid and a simple guide on how to add them:

F-Droid - Known Repositories: https://forum.f-droid.org/t/known-repositories/721

See: App Repositories

Some little rules of the list

The Applications included in the list match the following parameters, the parameter list is not complete at this time, and there may be exceptions. See: Disclaimer

  • Source code is not findable/easily available.
  • Applications whose download is exclusively on Google Play.
  • There are no repositories on F-Droid, GitHub etc, consequently the application cannot be updated easily.
  • The project/app has not been updated for some time or is no longer maintained (i.e., archived status): Generally, Applications are removed from the list after 1 year or so that the package/release is not updated. This is with exceptions based on the type of Application, or if for example it is still valid and there is no alternative.
  • Applications that aren’t really fundamental (like Wi-Fi On/Off, Show my IP Address, various Flashlights etc.)

Security:

Security related applications such as file encryption, password managers etc. are included if they are stable and tested by many users, so usually the most popular applications are included. However, it is not a mandatory parameter.

Android and Linux based Mobile OS

App Stores

  • F-Droid - F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform.
  • Droid-ify - Minimal F-droid client for design and performance.
  • Neo Store - An F-Droid client with modern UI and an arsenal of extra features.
  • Fossdroid - Free and open source Android apps.
  • Aurora Store - FOSS client for Play Store.

App Repositories

  • IzzyOnDroid - This is an F-Droid style repository for Android apps, provided by IzzyOnDroid.
  • Fossify - A suite of open-source, ad-free apps with customizable colors.
  • Guardian Project - Guardian Project is a project that creates easy to use secure apps, open-source software libraries, and customized solutions for personal security, anonymity and privacy.
  • You Apps - A collection of open source Android apps, developed with privacy in mind and beautiful design.
  • SECUSO - SECUSO - Security Usability Society.
  • MicroG Project - A free-as-in-freedom re-implementation of Google’s proprietary Android user space apps and libraries.
  • CalyxOS - App stores, app compatibility, and apps special to CalyxOS.

2FA

  • Aegis Authenticator - Aegis Authenticator is a free, secure and open source app for Android to manage your 2-step verification tokens for your online services.
  • FreeOTP Plus - Enhanced fork of FreeOTP-Android providing a feature-rich 2FA authenticator.
  • Stratum - Free and open-source two-factor authentication.
  • Ente Auth - Open Source 2FA authenticator, with end-to-end encrypted backups.
  • Etopa - Time-based one-time password authenticator.

Alternative Network

  • Orbot - Orbot - Tor VPN for smartphones.
  • Tor Browser - Tor Browser is a free and open source software that protects your privacy and security online.
  • I2P - Free and open source project building an anonymous network.

Browser

  • Cromite - Cromite a Bromite fork with ad blocking and privacy enhancements.
  • Fennec F-Droid - Firefox for Android is a web browser developed by Mozilla for Android smartphones and tablet computers.
  • DuckDuckGo Privacy Browser - DuckDuckGo free web browser that protects your privacy.
  • Privacy Browser - Privacy Browser Android is an open source Android web browser focused on user privacy.
  • FOSS Browser - A simple Android webbrowser based on webview.
  • FREE Browser - A privacy oriented web browser with Greasemonkey style script support and Cookie Banner Blocker.

Calculator

  • Fossify Calculator - A calculator for quick simple calculations with a nice user interface and no ads.
  • OpenCalc - A simple and beautiful calculator for Android.
  • CalcYou - Privacy focused calculator app built with MD3.
  • Calculator-You - Calculator You is a beautiful calculator for solving simple tasks.
  • yetCalc - Yet another calculator designed and developed for Android.
  • DigitalCalculator - A neumorphic themed digital calculator which has keyboard support (external bluetooth keyboard).
  • CuteCalc - CuteCalc is a simple,lightweight and open-source calculator app for Android.

Calendar

  • Proton Calendar - Proton Calendar helps you stay on top of your schedule while protecting your data. (Account Required)
  • Tuta Calendar - Tuta Calendar is the only zero-knowledge calendar with quantum-safe encryption. (Account Required)
  • Fossify Calendar - Your Private & Powerful Schedule Planner.
  • Etar Calendar - Android open source calendar.
  • DAVx5 - CalDAV / CardDAV / WebDAV for Android.

Camera

  • Open Camera - Open Camera is an Open Source Camera app for Android phones and tablets.
  • Fossify Camera - Quick photo and video camera with a flash, customizable aspect ratio.

Clock

  • Simple alarm clock - Most popular open source Android Alarm Clock App.
  • Clock You - Privacy focused clock app built with MD3.
  • Chronos - A simple alarm clock focused on simplicity, usability and modern design.
  • Clock - A Jetpack Compose clock app with timer, stopwatch and one-time/recurring alarms.

Cloud

  • Nextcloud - Nextcloud Android app.
  • ownCloud - The new and most secure version of ownCloud real-time content collaboration platform.
  • Filen Mobile - Access your files on the go, wherever you are.
  • seadroid - Android client for Seafile.

Contacts

  • Fossify Contacts - Easy and quick contact management with no ads, handles groups and favorites too.
  • OpenContacts - Privacy to your contacts.
  • Connect You - Privacy focused contacts and SMS messenger app built with MD3.

Documents Reader

  • MuPDF viewer - Lightweight document viewer.
  • OpenDocument - It’s Android’s first OpenOffice Document Reader!
  • MJ PDF - MJ PDF is a fast, minimalist, powerful and totally free PDF viewer made by Mudlej.
  • Sav PDF Viewer - Android app to read your PDFs.
  • Librera - Librera Reader (a.k.a. Lirbi Reader, PDF Reader) is a highly customizable and feature-rich application for reading books.
  • Orion Viewer - Orion Viewer is pdf, djvu, xps, cbz and tiff file viewer for Android devices based on mupdf and DjVuLibre libraries.

Email Client

  • FairEmail - Fully featured, open source, privacy friendly email app for Android.
  • Thunderbird for Android - Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)
  • ProtonMail - Secure email that protects your privacy.
  • Tutanota - Encrypted email always by your side.

Email Anonymous Forwarding

  • SimpleLogin - SimpleLogin is an open source solution to protect your email inbox.
  • addy.io (formerly AnonAddy) - The Android app for addy.io (formerly AnonAddy) - Anonymous email forwarding.

Exif/Metadata

  • ExifEraser - Permissionless image metadata erasing application for Android.
  • Scrambled Exif - Remove Exif data from pictures before sharing them.
  • Imagepipe - Reduces image size and removes exif-tags when sharing images on android devices.
  • Image Toolbox - A powerful app for advanced image manipulation.

File Manager

File Sharing

Local

Remote and Local

  • Wormhole - An open source Android App for sending/receiveing files using the magic-wormhole protocol.
  • iyox Wormhole - An Android Client for the magic-wormhole protocol.
  • Aves - Aves is a gallery and metadata explorer app, built for Android with Flutter.
  • Gallery - Light-weight Media Gallery app for Android made with Jetpack Compose.
  • Fossify Gallery - Browse your memories without any interruptions with this photo and video gallery.
  • Photok - Encrypted Photo Safe for Android
  • Valv - An encrypted gallery vault for Android devices.

Instant Messaging

Centralized

  • Signal - State-of-the-art end-to-end encryption (powered by the open source Signal Protocol) keeps your conversations secure.
  • Molly - Molly is a hardened version of Signal for Android, the fast simple yet secure messaging app by Signal Foundation.
  • Threema - Threema is a secure and private messaging app that encrypts your communication, lets you make voice and video calls, and offers various features.
  • Forkgram - Fork Client is a fork of the official Telegram for Android application.

P2P

  • SimpleX Chat - Privacy redefined. The first messenger without user IDs.
  • Briar - Censorship-resistant peer-to-peer messaging that bypasses centralized servers. Connect via Bluetooth, Wi-Fi or Tor, with privacy built-in.
  • Jami - Jami is a free/libre, end-to-end encrypted, and private communication software.

Matrix Client

  • Element - A glossy Matrix collaboration client for Android.
  • SchildiChat - SchildiChat for Android is a Matrix Client based on Element Android.
  • FluffyChat - FluffyChat is an open, nonprofit and cute matrix messenger app for Ubuntu Touch, Android and iOS.

XMPP Client

  • Conversations - Conversations is a Jabber/XMPP client for Android 5.0+ smartphones that has been optimized to provide a unique mobile experience.
  • monocles chat - The monocles chat. A more modern and secure chat client based on blabber.im and Conversations for Android but with a lot of changes.
  • Moxxy - An experiment in building a better XMPP client. This time using Flutter.
  • aTalk An encrypted instant messaging with video call and GPS features for android (XMPP/Jabber).

Launcher

Lemmy Client

  • Voyager for Lemmy - Voyager is a free and open source client for Lemmy.
  • Jerboa - A native android app for Lemmy.
  • Thunder for Lemmy - An open-source cross-platform Lemmy client for iOS and Android built with Flutter.
  • Eternity - A Lemmy client for Android written in Java. It’s a fork of the Infinity for Reddit project, currenty in early development.
  • Raccoon for Lemmy

Keyboard

  • HeliBoard - Customizable and privacy-conscious open-source keyboard.
  • Simple Keyboard - This keyboard is created for those who only need a keyboard and nothing more.
  • Fossify Keyboard - Easy keyboard for inserting all kinds of texts, special characters and numbers.

Maps

  • OsmAnd - Offline Maps and Navigation.
  • Organic Maps - Organic Maps is a free Android & iOS offline maps app for travelers, tourists, hikers, drivers and cyclists based on OpenStreetMap data created by the community.
  • PocketMaps - Free offline maps with routing functions and more.
  • GMaps WV - Restricted GMaps WebView.

Media Player

  • Apollo - Apollo-Music is a fork from CyanogenMod’s Apollo music app supporting Android 4.1+.
  • VLC - VLC for Android is a full port of VLC media player to the Android™ platform.
  • Auxio - A simple, rational music player for android.
  • OuterTune - A Material 3 Music Player with YouTube Music support for Android. Forked from InnerTune.
  • Retro Music Player - The best Material design offline music player for Android.
  • Gramophone - A sane music player built with media3 and material design library that is following android’s standard strictly.
  • Fossify Music Player - A clean music player with a customizable widget, stylish interface and no ads.
  • mpv-android - mpv-android is a video player for Android based on libmpv.
  • Nova - NOVA: opeN sOurce Video plAyer.
  • VinylMusicPlayer - A material designed music player for Android.
  • MonsterMusic - A music player on android platform, developed by Andoroid composer.
  • CuteMusic - CuteMusic is a simple,lightweight and open-source offline music player app for Android.

YouTube Alternative Client

  • NewPipe - The lightweight YouTube experience for Android.
  • InnerTune - A Material 3 YouTube Music client for Android.
  • PipePipe - Alternative Android streaming front-end of BiliBili, NicoNico, YouTube and more.
  • Seal - Video/Audio Downloader for Android, based on yt-dlp, designed with Material You.
  • YTDLnis - YTDLnis is a free and open source video/audio downloader app that uses yt-dlp, a program that can download videos and audio from over 1000 websites.
  • SkyTube - A copylefted libre / open source YouTube player for Android, without ads.
  • LibreTube - An alternative frontend for YouTube, for Android.
  • SongTube - Simple & Beautiful App (Tool) made in Flutter to Download Media from YouTube.
  • Musify - Unlock the full potential of music: Stream effortlessly with one app.
  • Clipious - Invidious client for android.

Network Security

Firewall and ADS Blocker

  • NetGuard - A firewall app for Android.
  • Blokada - Blokada is the popular ad blocker and privacy app for Android and iOS.
  • InviZible Pro - Android application for on-line privacy and security.
  • RethinkDNS - Block malware, spyware, ads, and trackers across all apps with Rethink DNS.
  • TrackerControl - TrackerControl is an Android app that allows users to monitor and control the widespread, ongoing, hidden data collection in mobile apps about user behaviour (‘tracking’).

VPN Client

  • OpenVPN for Android - OpenVPN for Android
  • Mullvad VPN - Mullvad VPN for Android.
  • ProtonVPN - Trusted and easy-to-use VPN app for Android.
  • IVPN - IVPN for Android.
  • CalyxVPN - Free VPN Service offered by The Calyx Institute.
  • RiseupVPN - RiseupVPN for Android.
  • Bitmask - Encrypted communication for mere mortals(superheroes welcome, too).

Wireguard Client

  • WG Tunnel - This is an alternative Android Application for WireGuard with added features.
  • Windscribe - Free VPN and AD Block.

Other Wireguard based

  • NymVPN - Nym is a ‘noise generating mixnet’ (NGM) that provides private traffic routing for any online app or service. - (Network Type: P2P, MixNet)
  • Tailscale - Deploy a zero-config, no-fuss VPN. Deploy a WireGuard®-based VPN that eliminates single points of failure. (Network Type: P2P, Mesh VPN)
  • UpVPN - Modern VPN for all of your devices. With full control of your data for privacy. Based on WireGuard. (Network Type: Serverless, Self-hosted VPN)

Notes

Cloud Syncing

  • Joplin - Joplin is a free, open source note taking and to-do application.
  • Standard Notes - Standard Notes is a free, secure note-taking app with powerful end-to-end encryption.
  • Notesnook - Open source. End-to-end encrypted. Private.
  • SilentNotes - SilentNotes is a note taking app which respects your privacy.
  • Quillpad - An open source notes app.

Local

  • Markor - Text editor - Notes & ToDo (for Android).
  • Tasks - Open-source To-Do Lists & Reminders.
  • Notally - A beautiful notes app.
  • NotallyX - Minimalistic Android note taking App - Notally, but eXtended.
  • Notes (PFA) - Privacy Friendly Notes App.
  • traced it - Quick notes with time and amounts.
  • LocalMaterialNotes - Simple, local, material design notes.
  • sNotz - Notes & Checklists.
  • Open Note - Markdown Editor & Notebook for Android built with Jetpack Compose.

Password Manager

  • Bitwarden - The password manager trusted by millions.
  • KeepassDX - Open source Password Manager for Android.
  • Proton Pass - Password manager created by the scientists who met at CERN behind Proton Mail.

Phone SMS

  • Fossify Phone - A handy phone call manager with phonebook, number blocking and multi-SIM support.
  • Fossify Messages - An easy and quick way of managing SMS and MMS messages without ads.

Reddit Client

  • RedReader - An unofficial open source Android app for Reddit.

RSS Reader

  • Feeder - Android RSS reader app.
  • Nunti - Finally a smart RSS reader which doesn’t suck ass or your data.
  • Geekttrss - Geekttrss is an Tiny Tiny Rss reader application with transparent offline mode for the Android platform.
  • Twine - RSS Reader - Twine: A multiplatform RSS reader built using Kotlin and Compose.

Social Network Client

Mastodon

  • Mastodon - Decentralized social network.
  • Moshidon - A fork of megalodon which is a fork of official Mastodon Android app adding important features that are missing in the official app.

Twitter/X

  • Squawker - An open-source privacy oriented Twitter/X client.
  • Quacker - The read-only Twitter/X app for Android.

Nostr

  • Primal - Primal’s Android app for Nostr.
  • Voyage - Lightweight nostr client for Android.

Pixelfed

  • PixelDroid - Pixelfed Android client.
  • Pixelix - Pixelfed client for Android and iOS.

Other

  • Fedilab - Fedilab is a multifunctional Android client to access the distributed Fediverse.

System Security

  • Shelter - Provide an isolated space that you can install or clone apps into
  • FindMyDevice - Find your Device with an SMS or online with the help of FMDServer.
  • Exodus - Let you know what trackers are embedded in apps installed on your smartphone.
  • Cryptomator - Multi-platform transparent client-side encryption of your files in the cloud.
  • DroidFS - Encrypted overlay filesystems implementation for Android.
  • QR Scanner - Privacy Friendly QR Code Scanner for Android.
  • Igatha - Igatha is an open-source SOS signaling and recovery app designed for war zones and disaster areas, enabling offline emergency communication when traditional networks fail.
  • URLCheck - Allows you to analyze (or share) urls before opening them.

See: Encrypted Gallery section.

Weather

  • OSS Weather - An OSS weather app for iOS/Android.
  • Breezy Weather - A Material Design Weather Application.
  • QuickWeather - Weather at a glance! Current and forecast weather for anywhere in the world!
  • omWeather - Weather and rain radar for any location - worldwide,



Disclaimer

This list is only intended to recommend to users Free Open Source (or Open Source) Applications that respect privacy and requirements that I believe would be good on a personal device. Before installing anything on your smartphone please check the sources well and be careful.

Thanks

Special thanks to all the people who show me the applications to be included and who help me to improve the list!


Donations

Please donate a litte to support my projects:

Bitcoin

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Monero

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