Useful Android and iPhone apps

OSS Document Scanner

Scan documents, adjust page edges and contrast, organize files, and export PDFs with OSS Document Scanner for Android.

By Akylas

OSS Weather

Check hourly rain, wind, and temperature forecasts for trip planning with OSS Weather for Android and iPhone.

By Akylas

phyphox

Use supported phone sensors to record and graph data for physics experiments.

By RWTH Aachen University

Picsart

Edit photos, add text and make collages on Android, iPhone or iPad, with a free option and paid tools.

By PicsArt, Inc.

Pixelc

Draw pixel-art sprites and tiles with touch controls, layers, animation frames and custom palettes on Android.

By René Horstmann / Horsimann

Pocket Casts

Find podcasts, build episode playlists and download shows for offline listening on Android and iPhone.

By Automattic / Pocket Casts

PSLab

Measure Android phone sensors and use compatible laboratory hardware with the free PSLab app for Android and iPhone.

By FOSSASIA

QuickDic

Look up words in downloaded dictionaries, switch language pairs, and collect a word list with QuickDic for Android.

By Reimar Döffinger

Quillpad

Write Markdown notes, make checklists, attach files, and organize notebooks with Quillpad for Android.

By JSixface

RunnerUp

Record running sessions, follow interval workouts, and review pace, distance, and time with RunnerUp for Android.

By Jonas Oreland

Saber

Write handwritten pages, annotate imported material, and organize PDF notes with Saber for Android and iPhone.

By Adil Hanney

StreetComplete

Answer simple questions about nearby streets and places to improve OpenStreetMap with StreetComplete for Android.

By westnordost

Tasks.org

Organize tasks with nested subtasks, reminders, repeating schedules, and optional synchronization in Tasks.org for Android.

By Tasks.org, LLC

Telegram

Send messages and files, join groups and channels, and keep cloud chats across supported devices with Telegram.

By Telegram FZ-LLC

Thunderbird

Manage several email accounts, use a unified inbox, search messages, and choose synchronization settings with Thunderbird for Android.

By Mozilla Thunderbird

TimeR Machine

Build repeating work-and-rest timers with custom sounds, spoken reminders, and multiple stages in TimeR Machine for Android.

By Dewey Reed

Tor™ Browser

Browse through the Tor network on Android, with connection assistance and configurable bridge options.

By The Tor Project, Inc.

Track & Graph

Record habits and measurements, group them into dashboards, and review trends with Track & Graph for Android.

By SamAmco

Trail Sense

Use phone sensors, saved paths, bearings, and sunset information for outdoor trips with Trail Sense for Android.

By Trail Sense

Tuner

Check musical pitch with instrument tunings, pitch history and spectrum views on Android.

By Michael Moessner

Tux Paint

Draw with brushes, shapes and text, then choose colours with a palette or mixer on Android.

By Tux Paint Development Team

Vespucci

Survey places, edit street properties, and contribute OpenStreetMap data with Vespucci for Android.

By Marcus Wolschon

Vivaldi

Browse with flexible tabs, bookmarks, notes and built-in tracker and ad-blocking controls on Android and iPhone.

By Vivaldi Technologies

Voice Audiobook Player

Listen to your local audiobook files, resume saved positions, and set bookmarks or sleep timers with Voice for Android.

By Paul Woitaschek