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950+ free, open-source Android apps — and growing.
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OpenTagViewer
See your AirTags on an Android phone
OpenToday
Plan your day and never forget a reminder again
Operit AI
An AI helper that can actually use your phone
Oppia
Free, friendly lessons that work even without internet
Organic Maps
Offline maps that respect your privacy
Orgzly
Organize your notes and to-do lists with a simple outliner
Origo Reader
An elegant ebook reader for EPUB, PDF, and text files
OsmAnd
Super-detailed offline maps for adventurers
OsmGo
Add places to the open map as you walk past
Osmin
GPS navigation for roads and trails, powered by OpenStreetMap
OSS Document Scanner
Scan documents and read the text on them
OSS Weather
A clean forecast app for phones and watches
OtakuWorld
Three readers and watchers sharing one design
OTP Helper
Copies verification codes out of notifications
OuterTune
Plays your own music files and YouTube Music
Overlay Translator
Translate on-screen text instantly, right over the page
OwnTracks
Share your location with your own server only
P4OC
Follow an AI coding session from your phone
Pachli
A polished Mastodon app with thoughtful extras
Page 11
Play classic newspaper puzzle games for free
Panther
A browser that blocks ads, trackers, and shows what sites are doing
Paperize
Changes your wallpaper on a schedule, offline
PaperKnife
Merge, split and squash PDFs on your phone
Papyrus Reader
Organize your ebook collection across all your devices