CO3 is a free reader app for Archive of Our Own (AO3). We built it because other AO3 apps charge money for features that should be free.
The goal is to give you a better reading experience on your phone with features like native AMOLED support, local reading history, and custom categories to organize your stories.
Tip
Looking for download links? Go here.
- Custom library - Save your favorite works in one place
- Category management - Organize your stories however you want (without paying for it)
- History with filters - Find works you've read by date
- Completely free - No subscriptions, no ads, ever
Update notifications when new chapters come out(Done !)Bookmarks(Done !)View and read comments(Done !)User profile pages(Done !)Statistics screen(Done !)Download works to read offline(Done !)
Note
Need help or want to chat? Join our Discord.
We recommend you use F-Droid to install the client, this will allow for auto-updates and alert you if any vulnerabilities are found.
You can get releases here.
You can get android dev builds here.
You can get IOS dev builds here.
Caution
iOS builds are currently untested since none of the contributors have iOS devices. If you’re on iOS, we’d really appreciate any bug reports you can share.
It is possible that they don't even launch, we really have no idea. Some user reported the app working, athough we don't know how true that is and what remains to be fixed.
The name "CO3" or "Client Of Our Own" and the project logo are copyright © Tbvns and are not covered by the GPL license. You may not publish this application or any derivative under the same name or logo on the Google Play Store, Apple App Store, or any other proprietary app store. Redistribution via F-Droid or direct APK sideloading is permitted.
Copyright (C) 2026 Tbvns
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see https://www.gnu.org/licenses/.