An AAC player for iPhone

AAC is the codec of the iTunes era — the successor to MP3, better quality at the same bitrate, and the format behind two decades of store purchases and iTunes rips.

Why the built-in Music app isn't enough

AAC plays natively on iOS, so the limits are organizational. The Music app's navigation is fixed regardless of how a collection is structured, its performance degrades as libraries grow large, and metadata is read-only on the device — fixing a mistagged album means a computer and a re-sync. A collection built up over twenty years of iTunes deserves better tooling than that.

How BTR AMP plays AAC

BTR AMP plays AAC in every wrapper it arrives in — .aac streams as well as M4A/M4B/MP4 containers — and your existing iTunes library plays side by side with non-iTunes files. The on-device editor covers MP4/iTunes tags, custom tabs and smart playlists replace fixed navigation, and the library stays fast at 50,000+ tracks. The same organization carries into CarPlay. See the full feature set.

Getting your AAC files onto your iPhone

Files transfer without a computer sync.

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.