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BitPurfect 1.0

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@Booloo26 Booloo26 released this 13 Aug 10:15
· 4 commits to main since this release
v1.0
5c3480e

Keeps your DAC on the same sample rate as whatever Apple Music is playing — and stops it clicking between tracks.

Anti-pop, for sensitive IEMs

If you use efficient IEMs on an outboard DAC, you know the click when the music pauses or a track ends. That's the DAC powering its output stage back up after going idle — the relay closing, charge pumps spinning up — and the more sensitive your IEMs, the more of it you hear.

BitPurfect holds a silent stream open so the DAC never falls asleep. While music plays it writes exact digital zeros, so a bit-perfect path stays bit perfect; only when idle does it write dither at roughly -120 dBFS, for DACs that listen for digital silence rather than an idle USB stream. Wired external DACs only — the built-in jack, Bluetooth and AirPlay are skipped.

It cannot remove the click some DACs make when re-locking to a new sample rate; that's inherent to following the source. If yours does that and you'd rather have silence than bit-perfect playback, pin a rate with Force output rate.

BitPurfect panel

Also in this release

  • Follows the source rate: 44.1 / 48 / 88.2 / 96 / 176.4 / 192 kHz and beyond
  • Picks an integer ratio when it can't match exactly — 176.4 kHz on a 96 kHz-max DAC goes to 88.2 kHz (clean 2:1), not the numerically closer 96 kHz
  • Puts the rate back if Audio MIDI Setup or another app changes it
  • Says plainly when playback isn't bit perfect, and why
  • Four themes, including Liquid Glass on macOS 26+
  • Launch at login

Install

macOS will block this on first launch: it's signed with an anonymous (ad-hoc) signature and not notarized.

  1. Drag BitPurfect to Applications and double-click it. macOS refuses.
  2. Open System Settings → Privacy & Security, scroll to the message about BitPurfect, click Open Anyway, confirm.

Recent macOS removed the right-click → Open shortcut, so that's the only route. From a terminal instead:

xattr -d com.apple.quarantine /Applications/BitPurfect.app

Nothing leaves your machine — no network access, no analytics, no accounts.

Requirements

  • Apple Silicon Mac. arm64 only; a universal build needs full Xcode (see the README for why)
  • Apple Music with Lossless enabled (Settings → Playback → Audio Quality)
  • No admin account needed

Known limitations

  • Verified on macOS 27.0 only. Detection reads a Core Audio log line whose wording Apple could change in any release. Nothing below 27 has been tested.
  • Lossy streams report no rate at all — only the lossless decoder logs one — and the panel says so rather than guessing.
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