Decaud

● local-first music player · mac + iphone + ipad + carplay · free

Hear your music. All of it.

Decaud shows you the real quality of every file and every stage between the file and your hardware: hi-res lossless, DSD, and a signal path you can actually see. Your files, your DAC, nothing hidden.

Mac, iPhone, and iPad

free · macOS 15.6+ · iOS 17.6+ · no account · no subscription · no tracking

the DMG here is the Direct edition: it can take exclusive device access for native DSD over DoP to a compatible DAC. Otherwise it uses shared output. The Mac App Store edition cannot take exclusive access, so it converts DSD to PCM. which edition?

already using Direct 1.4 or earlier? Install 1.5 once from this page: it moves to a new update channel, and the copy you have cannot reach it on its own. From then on updates install as before from Decaud › Check for Updates.

verify the download in Terminal:

$ shasum -a 256 ~/Downloads/Decaud.dmg
ef23c0f981b23262d5b6eb10fbf5e646512d02e8becebffbaf2c9e5a0694abbf  Decaud.dmg

earlier version? all releases, checksums, changelog

At a glance
Outputbit-perfect, exclusive device access (Direct Mac)
DSDnative to DSD256 over DoP on Direct Mac, DSD512 plays too (why not native)
AnalysisTrueHz spectral analysis
RoomsAirPlay multi-room, Sonos, DLNA, Chromecast
On the goUSB-C and SD drives on iPhone and iPad, CarPlay in the car
Librarylocal first, yours, iCloud optional
Price$0, tip jar if you insist
NativeDSD Starter Pack, Decaud edition: a complimentary selection of music in Direct Stream Digital

● included with 1.5 · nothing to buy

Start with seven DSD64 tracks.

The NativeDSD Starter Pack is a complimentary sampler in a Decaud edition, offered as a shelf on Home. The tracks download into your own storage and play offline like any other file you own. On the Direct Mac edition they play as native DSD over DoP to a compatible DAC. On iPhone and iPad, DSD converts to PCM by default. On iPhone (1.5 and later), native output needs the Native DSD (DoP) switch under Settings ▸ Audio Output and a USB DAC you have confirmed supports it; keep the iPhone volume at 100% and control listening volume on the DAC.

Courtesy of NativeDSD · what DSD actually is

01 · iphone, ipad + carplay

Your library, without the desk

Plug the drive that already holds your music into an iPhone or iPad. Decaud can play it there, copy selected music to the device, or keep it in your own iCloud. In the car, CarPlay presents the part of the library the phone can actually play.

USB-C and SD, directly
Import or play in place. FLAC, AAC, and DSD keep their real format labels, and an unplugged drive is reported as unavailable instead of silently skipped.
A playable catalog for the road
Browse songs, albums, artists, and playlists in CarPlay. Alphabetical ranges shorten long lists; music that cannot start from the phone stays out of the driving catalog.
The same honest signal path
CarPlay is a shared output. Decaud shows the route and says when the car changes the sample rate rather than calling every connection bit-perfect.
New in 1.5: start with seven DSD tracks
The complimentary NativeDSD Starter Pack is available on Mac, iPhone and iPad. Downloads stay on your device and play offline; uploading to iCloud is your choice. On iPhone, DSD converts to PCM by default. Native DSD requires the opt-in Native DSD (DoP) switch under Settings ▸ Audio Output and a USB DAC you have confirmed supports it; keep the iPhone volume at 100% and control listening volume on the DAC.
Download on the App Store
Decaud on iPhone playing a FLAC track after an external USB drive reconnects
fig. 09 external USB library reconnected on iPhone
Decaud playing a local lossless track through a CarPlay dashboard
fig. 10 now playing in CarPlay, using the car's shared audio route

Apple TV · on the App Store

Your library, from the sofa

Browse albums, artists, songs and playlists with the Siri Remote. Stream from a Mac running Decaud in Server Mode or a compatible media server. Follow timed lyrics and open Info to see the source format and audio output.

A catalog is not an audio file
Optional iCloud sync keeps your library metadata together. Download via iCloud requests a cached audio copy; a Mac with the original may need to upload it. With sync off, downloaded songs and music available over your network remain visible.
Storage stays in your hands
Remove one download, an album or all cached songs. Your originals and ratings stay intact. Apple TV may reclaim its cache. Audio uses the TV's shared system output; native DSD over DoP is not available.
Try it before connecting a library
A fresh installation offers three optional demo albums that work offline. Analyzer, Filled and Fur visualizers are available under Experimental Features, off by default.
Decaud on Apple TV showing Warm Signal, its timeline, and a highlighted line from the bundled demo lyrics
fig. 11 Apple TV Now Playing with the offline demo; illustrative lyrics demonstrate line timing

02 · what it does

Built for people who can hear the difference

01

Bit-perfect, exclusively

In the Direct Mac edition, Decaud can take your DAC for itself, so macOS can't resample your stream or mix other sounds into it. What's in the file is what reaches the hardware. The Mac App Store edition uses shared output, and the signal path says so.

02

Native DSD

DSD64, DSD128, and DSD256 delivered untouched over DoP to capable DACs in the Direct Mac edition, with optional native output to a verified USB DAC on iPhone in 1.5 and high-quality PCM conversion on other routes.

03

A signal path you can see

Every stage between file and device, laid out with a per-stage quality verdict. When something isn't bit-perfect, Decaud says so instead of hiding it.

04

TrueHz analysis

Spectral analysis that looks for signs of lossy ancestry and keeps the result with your track. Read the method and its limits.

05

Whole-house audio

Multi-room AirPlay in perfect sync, Sonos, DLNA, and Chromecast casting, NAS/SMB and DLNA streaming including DSD, and an iPhone remote for the Mac library.

06

A library that stays yours

Local-first files organized your way, serious tag editing with Discogs and MusicBrainz matching, CD ripping (error-corrected on Direct Mac), and cue-sheet splitting, DSD included.

07

Your music on every device

Import from a USB-C or SD drive on iPhone and iPad, straight into your own iCloud, or play in place right off the drive. Plug the same drive into your Mac and the songs are just there.

08

A phone that knows your Mac

The iPhone Home screen picks up what the Mac is playing, one tap takes control: browse the Mac's library, queue songs, and drive playback from the couch.

03 · what it plays

FLACALACDSFDFFAPEWVWAVAIFFMP3AACOPUSOGG

plus: cue sheets split into real tracks (multi-disc aware) · SACD ISOs extracted to bit-perfect DSF · audio CDs ripped, error-corrected on Direct Mac

no DSD on hand? grab our public domain DSD sample files (DSD64 to DSD256, free)

04 · the lab

TrueHz: evidence, not promises

The TrueHz Quality tab: a Hi-Res Lossless verdict for a DSD recording, the sampled peak-hold spectrum, and the claimed-versus-measured table
fig. 08 TrueHz report with an 88 kHz analysis rate · verdict Hi-Res Lossless. A verdict is not proof of provenance.

A "24/192" label describes a file's format, not its recording history. TrueHz inspects spectral evidence and keeps the result with your track:

  • Windows across the track. Up to 220 sampled windows contribute to median and peak-hold spectra.
  • Cutoffs and bandwidth. Sharp drops and quiet upper bands can suggest lossy ancestry, but can also occur in genuine masters.
  • Codec information. When available, the decoder's codec classification takes precedence over the filename extension.
  • Evidence with limits. Hiss, filtering, sparse events and channel cancellation can affect the verdict. High-frequency energy does not prove that a recording began as hi-res.

The verdict persists per track and appears as a quality badge in your Songs list. Re-run anytime with right-click → Analyze. Treat the result as a prompt to inspect, not proof of provenance.

Read the methodology, verdict rules and known failure modes.

05 · the colophon

Decaud is free

It's built by one person who thinks great sound shouldn't need a subscription. If it makes your music sound the way it should, you can keep it growing:

Buy me a coffee
bitcoin  bc1q0s858ev3jmyz4tddecujf2nl467m7j2jhu788l
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