FOSS apps: free and open source

Free and open-source software: the source code is public under an open licence.

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Healthy Battery Charging

Prolong the life of your battery by keeping it charged between 40% and 80%
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Heart Rate Monitor

Monitor heart rate via BLE devices with real-time display, history, and alerts
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
HeartBeat

Calculate heart rate from camera image
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub
hEARtest

Quick and simple hearing evaluation
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Heartwood

A private, read-only Material You viewer for your Health Connect data.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
H
HeaterRC

Remote control heater via SMS
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
HeliBoard

Customizable open-source keyboard
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
Helio

Music sequencer, designed to be used on all major platforms
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Heliodos

AR overlay of the sun's and moon's path on your camera
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Helsinki Timetables

Show timetables for public transport in Helsinki city and region
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Hermes Mobile

Remote control for your Hermes AI agent
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Hertz contact

Hertz contact is for ball-on-flat static mechanical contact calculation.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Hestia

Local control of Shelly devices — no cloud, no account, no tracking.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Het Saldo

A cross-platform De Lijn "smart"ticket saldo checking application.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Hex Launcher

A minimalist launcher that puts your apps under your thumb
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
HexColorTime Wallpaper

Set the wallpaper color based on time hex value
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
HexViewer

Hexadecimal viewer for Android
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
HFUT-Schedule

All-in-one school service app for Hefei University of Technology students
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
HiddenProtectedWorkProfile

Hidden Profile owner Android security app.
- Security & privacy
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
H
Hide "running in the background" Notification

Hide the annoying "running in the background" notification
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Hidroly: Water Reminder

Track your water intake, privately.
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
HIIT

Interval timer
- Health & fitness
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Hikar

Overlays footpaths from OpenStreetMap on the device's camera feed.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Hindi for AnySoftKeyboard

AnySoftKeyboard Hindi Language pack
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
hippopotamos

Ancient greek study tool
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Hisap Kitap

Shop ledger and billing app for small businesses.
- Finance
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Hisn Elmoslem - Azkar & Dua

Comprehensive Azkar & Dua app from Hisn Elmoslem.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
hJOP Driver

hJOP Driver allows user to control model railroad via hJOPserver
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
HK Transport

An app displaying transport mode in Hong Kong with a respect to your privacy.
- Navigation
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
H
HN

Read and comment on tech news
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Holos

Holos: Mobile-first Fediverse client with your own ActivityPub identity
- Internet
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Holywarsoo

Lightweight Holywarsoo forum browsing app
- Communication
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Home App | For Philips Hue, Arduino & more

A little smart home app for Philips Hue, Arduino and other devices
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
Home Assistant

Control all your devices in your Home Assistant instance
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Home Medkit

Home Medkit — medicine storage and intake reminders.
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid IzzyOnDroid GitHub Zapstore
HomeBot

Remap the home button long press
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
HomeFeed - RSS Widget

HomeFeed is a customizable RSS feed widget
- Internet
- FOSS
- Free
- Paid
- No ads
- No tracking
- Android only
Google Play F-Droid GitHub Zapstore
Homer Audio Player for Seniors

Audiobooks and podcasts: simple player managed by a caregiver
- Multimedia
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid GitHub Zapstore
H
Hoop Draw

Draw lines to get a basketball into the hoop
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid Zapstore
HOPE 26

Program app for the HOPE conference
- Productivity
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
H
Hoplite Polytonic Greek Keyboard

A keyboard extension which allows the user to type in Polytonic Greek
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
Horus

Alpine Linux workspace for Claude Code, Codex, OpenCode, and a zsh shell
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
HostLookup

Explore DNS records and network information across public resolvers
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore
Hot Death

Card game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
Hourglass

Set variable timers with audible alarm and vibration
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
House of Cards

Solitaire-like card game
- Games
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid
How2Vote

See how parties' real parliamentary voting records compare with your views.
- Education
- FOSS
- Free
- No ads
- No tracking
- Android only
Google Play Aurora Store F-Droid Zapstore
HRLY

A minimalist hourly chime.
- System & tools
- FOSS
- Free
- No ads
- No tracking
- Android only
F-Droid GitHub Zapstore