BTR AMP
OGG Vorbis is the open, patent-free lossy codec that has long been the alternative to MP3, and Opus is its modern successor — technically superior at low and mid bitrates and now standard across the open-source world. Both typically ship in the Ogg container as .ogg or .opus files.
Why iPhone can't play OGG Vorbis natively
Apple has never supported the Ogg formats — not in the Music app, not in Safari, not in iOS itself beyond bare Files-app previews of some types. A Vorbis or Opus collection on iPhone traditionally meant batch-converting everything to AAC or MP3, a lossy-to-lossy conversion that degrades quality and forks your library into two copies. A player that reads the files directly avoids both problems.
How BTR AMP plays OGG Vorbis & Opus
BTR AMP plays OGG Vorbis and OGG Opus natively — support for both landed in version 15.0 alongside APE, Musepack, TTA, and WavPack. Files keep their original quality, tags and cover art are read from the files, and the on-device metadata editor handles Vorbis comments, the tag system both codecs use. Every track shows its exact codec details, and Vorbis and Opus files sit in one library with your MP3, FLAC, and everything else BTR AMP plays — no format sorting, no cleanup first.
Getting your OGG Vorbis & Opus files onto your iPhone
Ogg files transfer like everything else.
Send files over Wi-Fi from any browser on your computer (Connect → Wi-Fi Transfer), pull them from Google Drive, OneDrive, iCloud Drive, an SMB share, or WebDAV, use AirDrop, or play straight from a USB drive. The transfer guide walks through each method, and the importing guide covers the details.