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CO3

Name: CO3
Author: Tbvns

Tbvns

Feature riche, open source, AO3 mobile client

Education
FOSS
Free
No ads
No tracking

Android only

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What are these stores? F-Droid, Zapstore

A free reader app for Archive of Our Own (AO3). Built because other AO3 apps charge money for features that should be free. Features: Custom library with favorites Category management and organization Reading history with filters Native AMOLED support Offline reading No subscriptions, no ads, ever.

Developer: Tbvns
Source code: github.com/tbvns/CO3
Added to AppCosmos: 9 October 2026
License: GPL-3.0-or-later