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Ankidrone decks: Audio issues on iOS

December 07, 2025 — Tatsumoto Ren

I wanted to reach out regarding Ankidrone Essentials V8. On my computer, all the audio files play without any issues. However, in Anki Mobile on iOS, many of the audio files do not play.

I tried converting all the OGG files to MP3 to make them compatible, but I ran into problems.

Do you know if there is a way to make this deck play all the audio files in Anki Mobile, or does it only work on the computer? Any guidance or solution would be greatly appreciated.


Most Anki decks linked on our site come with audio in the Opus format. iOS does not support Opus.

We do not recommend using iThings for a number of reasons:

The best solution is to sell your iThing and get a device that is supported by GrapheneOS.

Using MP3 audio in Anki is not recommended because MP3 files must be a lot larger than Opus files to match quality, which wastes disk space and slows syncing.

If you still want MP3, run ffmpeg in your collection.media folder to convert files. See this page for details.

Tags: faq, decks