isthereanIs there an official AO3 app?
Short answer
No. The Organization for Transformative Works says AO3 does not have an official mobile app. Use AO3 in a mobile browser and optionally add the website to your home screen. Any app presenting AO3 content is third-party and is not supported by AO3.
Use the mobile website
AO3 says its website is designed to work in mobile browsers. You can add the website to your phone's home screen for quicker access without giving an unofficial app your AO3 credentials.
Third-party apps are not AO3 products
AO3 does not control or support third-party reader apps. Before using one, check whether it is clearly labeled unofficial, what data it collects, whether it asks for your password and whether it charges for access to content that AO3 provides free on the web.
Downloads can cover offline reading
AO3 supports downloading works in several ebook formats from the website. Use a compatible reader for those files if you need offline access, while respecting the work's terms and the author's rights.
Sources and how we checked
Source-based research; not hands-on testing. We use official product pages, developer listings and support documentation, then flag details that still need checking.