Your mix / your reference
Place AB last on Main in your DAW. A monitors the host mix; B replaces it with your reference. At zero trim, A passes the mix unchanged.
Listen. Compare. Decide.
BEATBRIDGE
AB.
Your mix. Your reference. One switch.
Bring a reference file into your session or capture audio from another app. Move between A and B, compare at a matched RMS level and hear what your mix needs next.
Mac appVST3 + AUSystem audio
One-time price
$29 USD
Mac app + VST3 + AU · 2 computers
Available now.
Buy through Lemon Squeezy, receive your license key by email and activate it in the AB License panel. Includes a 7-day trial. macOS 13+ Apple Silicon; system audio needs macOS 14.2+.
License
Buy once. Use it on two Macs.
$29 one-time
Perpetual license · no subscription
2 computers
Activate and deactivate in the AB License panel
7-day trial
Full features before purchase
30 days offline
Purchased access cached after activation
AB uses the same signed license service as BeatBridge and SIDECHAIN, but a separate license. After purchase, open Settings → License or INFO → License, paste the key and press Activate. Need help? See activation support.
Reference without the detour
Keep the comparison close.
Local files
Drop a WAV, AIFF, FLAC, MP3 or M4A, or use LOAD B. Play, pause, seek and repeat without creating another track. A/B/SYS sources are available in the same window.
System audio
Capture audio from other apps on macOS 14.2 or later. The current host is excluded, and original system playback is muted during capture to avoid doubling.
RMS Auto-Match
Match A toward the reference RMS level, then fine-tune by ear. Compare 400 ms LUFS/RMS meters and switch the spectrum between A, B, SYS or COMPARE. RMS is not LUFS normalization or automatic mastering.
Compact by design
The compact 840 × 448 window keeps A/B, playback, gain and comparison in reach. Project state recalls the local file, loop, trim and position.
Local audio
Files and captured audio stay on your Mac. System capture needs macOS permission for the app or DAW that hosts AB.
Three steps
Hear the difference.
01
Put AB last
Place the plugin after your mix processing on Main. In standalone, connect an audio device with AUDIO.
02
Choose B
Load a file or enable SYSTEM. Grant audio-only capture permission to the DAW for system sources.
03
Match and compare
Play A and B, use Auto-Match, then switch between them. Adjust your mix with your ears.
Good to know
Clear boundaries.
Does AB stream or search Spotify and YouTube?
No. Play content in its own app or browser and use SYSTEM to capture supported system audio. AB has no streaming-service search, account integration or download function. Some sources may restrict capture.
What does system capture require?
An Apple Silicon Mac running macOS 14.2 or later, plus audio-only capture permission for the standalone app or your DAW. Local files support macOS 13 or later. Restart the host after granting permission.
Does A/B mean two sets of settings?
In AB, A is your incoming mix and B is the reference. It switches the audio source, rather than comparing parameter snapshots.
What happens when I switch SYSTEM off?
Capture ends and normal playback from other apps is restored. SYSTEM does not provide file seeking or looping; use the source app for those controls.
Can I buy it now?
Yes. AB is $29 one-time, includes a 7-day trial and a perpetual license for 2 computers. Buy through Lemon Squeezy; the license key arrives by email and is activated in the AB License panel.
How does licensing work?
AB uses the same signed license service as BeatBridge and SIDECHAIN. Activation needs internet; purchased access is cached for up to 30 days offline. The license is separate from BeatBridge and SIDECHAIN.