1-bit

1-bit is a private, bit-exact music player for iPhone and iPad. Play your own files from a UPnP/DLNA media server, an SMB share, your personal 1-bit-bridge server, or directly from the device — no cloud, no login, no account.

SOURCES • UPnP/DLNA media servers on your Wi-Fi — a NAS, MiniDLNA, Plex, or a Chord 2Go. Found automatically; browse and stream bit-exact, DSD included. • SMB shares on your home network (NAS, server, shared folder). • 1-bit-bridge — a free, open-source (MIT) companion server you run yourself on Mac, Linux, Raspberry Pi, or Windows. HTTPS with TLS-fingerprint pinning; tap-to-pair over Bonjour or scan a QR code. • On-device files dropped into the app via the Files app. • Offline downloads: pin albums, playlists, or tracks for bit-exact playback with no network.

AUDIO • Bit-exact PCM (FLAC, WAV, AIFF, ALAC, MP3, M4A) up to the limits of your DAC. • Bit-exact DSD via DoP for both DSF and DSDIFF (.dff) files, up to DSD512. Requires a USB DAC that reports DoP lock (Chord Hugo 2 / Mojo 2 / Hugo TT 2, iFi, Topping, etc.). • Gapless transitions when adjacent tracks share format and rate. • DAC-aware: per-DAC buffer and settle profiles for Chord, iFi, and other USB DACs; a thermal-aware buffer ladder keeps DSD256/512 smooth under load.

OUTPUT • Play on this device — USB DAC, AirPods, AirPlay 2, or built-in. • Cast straight to a DLNA renderer such as a Chord 2Go: a bridge- or media-server-sourced track streams from the source to the renderer directly, keeping your iPhone out of the audio path. Pick one from Now Playing.

CARPLAY • Browse Recently Added, Recently Played, Artists, Albums, Playlists, and Downloads from your car's screen, with an A–Z index. • Tap any track to play; Now Playing shows what's next with steering-wheel transport, shuffle, and repeat. • PCM only over CarPlay — DSD is hidden to avoid head-unit incompatibility.

LIBRARY • Fast SwiftData-backed library that handles 50,000+ tracks across SMB, bridge, and media-server sources. • Search tracks, albums, and artists; filter albums and artists by source. • Albums, artists, and playlists with cached artwork and artist images, plus a Recently Played history. • Classical metadata first-class: composer, conductor, work, original year, and BPM from your tags, shown in rows and album headers. A "Conducted by X" header appears when an album shares a conductor. • Multi-artist tracks split on "; " — long-press a credit to jump to that featured artist. • First-scan resumes in the background overnight when the device is on a charger.

PLAYER • Now Playing with smooth elapsed time, signal-path readout, and an artwork-derived background. • Resume where you left off — queue and position are restored even after the app is closed. • Home-Screen widget in multiple sizes: current track, its quality, a signal-path dot, and transport controls. • Long-press the mini-player for transport and queue; long-press a folder to Play, Add to Queue, Play Next, or Create Playlist — no scan required. • Lock Screen, Control Center, CarPlay, and AirPlay 2 transport. • Sleep timer (end of track or custom) and PCM crossfeed (off by default).

BRIDGE EXTRAS (OPTIONAL) • Upscaling: your bridge can serve higher-rate PCM variants of your own files, generated on your hardware with the original always preserved bit-exact. Pick a variant from the player and switch mid-track. No third party ever sees the file. • Backup: optionally back up playlists and playback history to your own bridge — off by default, never shared.

PRIVACY • No analytics, no tracking, no ads, no account servers. • Optional Deezer artist-image lookup is anonymous and off by default. • Passwords and tokens live in the iOS Keychain. • Network traffic stays on your LAN unless you connect to a remote bridge via Tailscale or similar. • Built-in log viewer — logs never leave the device unless you share them.

Requires iOS 26.1 or later.