This is your semi frequent reminder that there is no official AO3 app
All those are unofficial and available on the Google play store as of August 13th 2025. They mirror AO3's content and insert ads, for which the developer gets paid by page impression (that's every time the ad appears in the fic you're reading) not just clicks.
No money goes to AO3, nor to the fic writer. It goes to the person who did the bare minimum.
Many of these apps have poorly worded or non existent privacy policies, so they may also be mining as much data as possible and selling that on to unknown third parties.
Please, just use the official AO3 site and the browser.
As a guy who does Cyber IT as a living PLEASE USE THE MAIN SITE ON THE BROWSER! Do not use unofficial apps. You are opening yourselves up to a multitude of cyber threats, especially when there is no privacy policy or agreements.
The site is mobile optimized, and you can download the fics as PDFs or epubs if you need to read offline like on a plane, there is no reason to use a third party app.
