1by1 plays audio files directly from folders. It appears like a file manager with no need for playlists or media databases. With its simple user interface 1by1 does not waste your time with cover art, visualisation fireworks or ID3 titles.

Resume play remembers track and position. Bookmarking of tracks, positions, lists. File finder (Usage: long press on a folder). Directory finder. Sort, Shuffle, Repeat.

Audio enhancers for consistent volume and powerful sound. Gapless and Crossfade for smooth transitions. Mono mix. Fast play. Note: The DSP needs "Internal decoding". Enable it in the settings on Android 4.1 or newer.

Exportable internal playlist, M3U/M3U8 playlist support, Webstream play (by direct URLs in M3U playlists). Track coloring by month or name. Sleep timer. Very small app size, ad-free.

Supported types (depending on the system): MP3, OGG, AAC, MP4, WAV, FLAC, OPUS. Note: OPUS only with OGG-extension in Android 5 and 6.

Permissions: Read phone state (quit on incoming call), Wake lock (keep playing on screen off), Write on SD card (track delete, playlist export), Internet (webstreaming).