Desibel

Play FLAC and DSD straight from your NAS or cloud drive - no importing, no server. Gapless, and bit-perfect to a USB DAC by default. Free with 3 tracks a day.

Desibel plays your music straight from where it lives - your NAS, a cloud drive, or the files on your iPhone and iPad. Add a folder and play: no importing, no copying, no server, no account.

FLAC, ALAC, WAV and AIFF up to 768 kHz, DSD up to DSD256, and SACD disc images - gapless, on one screen with your folders and the player.

With a USB DAC it is bit-perfect by default: Desibel sends the exact samples in your files, and a status line tells you whenever anything changes them.

YOUR LIBRARY, WHEREVER IT LIVES • Browse your folders as they are - no library to build, no indexing. Tap a track and the rest of its folder follows. • NAS (SMB), WebDAV, iCloud Drive, Dropbox or on the device: if it's in the Files app, Desibel plays it, and your logins stay in the Files app. • Pin the albums you play most, jump to the playing track's folder, and Desibel reopens where you left off. • Cover art and booklets in the folder - images and PDFs - open in a viewer. • Keeps playing in the background, with the lock screen and Control Center, and seeking.

FORMATS • PCM: FLAC, ALAC, WAV, AIFF - up to 768 kHz, at native 16/24/32-bit integer • DSD: DSF and DFF - DSD64 through DSD256, native over DoP or decoded to PCM; DSD inside WAV, AIFF, FLAC and ALAC files (DoP) too • SACD: ISO disc images (stereo only), opened like a folder, including DST-compressed discs • Gapless playback • A damaged file stops with a message instead of being skipped silently, and keeps a mark next to its name

BIT-PERFECT BY DEFAULT Desibel hands each track to your USB DAC in its own native integer format and locks the DAC to the file's sample rate - no resampling, no dithering, no mixing, no hidden volume or EQ. The status line in the player says what's happening: • PCM / DSD - a clean bit-perfect lock at the file's native rate • DSD -> PCM - a disclosed, controlled DSD-to-PCM conversion for DACs that can't lock raw DSD • PCM UPSAMPLED / PCM -> DSD / PCM −6.02 dB - an optional conversion you turned on • RESAMPLED BY iOS (or iPadOS) / NON-USB OUTPUT - the audio couldn't stay bit-perfect on this route; PCM still plays and you're told, while DSD over DoP needs a USB DAC

OUTPUT MATCHING (OPTIONAL) Every conversion stays off unless you turn it on. If your DAC is at its best at a particular rate or format, you can opt in to: • Upsample PCM to a higher rate in the same family • Convert PCM to DSD • Lower the PCM level by exactly 6.02 dB for headroom - every sample halved, no filter Each is output matching for your DAC, not a fidelity improvement - done in integer, kept off the playback path, and always shown in the status line, never as a bit-perfect lock.

MEASURED, NOT GUESSED • Per-track dynamic range (DR), loudness range, loudness and true peak, measured from the source as you listen • A live HUD for the curious: buffer, dropouts, processing speed, true peak, and what goes to the system and your DAC • Test signals to check your setup: tape clicks at any rate, and pink noise for setting up speakers

PRIVATE BY DESIGN No tracking, no analytics, no ads, no accounts. Your music and your listening stay yours.

ONE-TIME PURCHASE Free to use with 3 tracks a day, every feature included. Unlock unlimited playback with a single purchase. No subscription, ever.

The app is in English, Japanese and Korean.

SCREENSHOTS The music in the screenshots: The Open Goldberg Variations and The Open Well-Tempered Clavier by Kimiko Ishizaka (CC BY 4.0; the DSD versions are our own conversions), and Musopen recordings (CC0).