Audio Leak - Audio equivalent level analyzer


Audio equivalent level analyzer

Leq (Long-term Equivalent Loudness Level) Analyzer for audio files / live audio input
  • Peak, Unweighted and A-Weighted RMS Leq (Table and Graph)
  • Accurate Conformity to A-Weighting standard
  • A-Weighting Supported Sample Rates: 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz
  • Analyze Audio Files of Any Length
  • Simultaneous, multithreaded file and live audio measurement
  • 200x real-time or faster file analysis on newer Macs: one hour of audio takes just seconds to process
  • Quick and easy to use, includes all of the above plus illustrated User Guide
  • Optional (with activation code): ITU BS.1770 LKFS loudness estimation, Histograms, Automatic Normalization, unique "Firefly" audio input metering, more
  • Professional Version available: Batch file processing, Variable Integration Time, Logging, Automatic Analysis Saves, Live 5.1 Channel LKFS, more
  • Details included in documentation included with AudioLeak download
  • Compatible with Mac OS X 10.4 and later (including Mac OS X 10.6 Snow Leopard), G3, G4, G5, Intel processor


Audio Leak Screenshot

Graph display

Audio Leak Screenshot

Graph display, Peak Check mode

Audio Leak Screenshot

Firefly input level meter



AudioLeak 3 Free (Version 3.13)

Includes Illustrated, 33-page User Guide

System requirements: Mac OS X 10.4 or later, including the latest Mac OS X 10.6 (Snow Leopard); G3, G4, G5 or Intel processor. MacOS 15 (Catalina) compatible version not available at this time.

This download is a free version of AudioLeak 3 that performs rapid (over 200 times real-time) peak, A-weighted and unweighted loudness estimation for audio files (and simultaneous, multithreaded audio input analysis); it can be enabled with many additional features with the purchase of an activation code. Complete information is included with the download in documentation (accessed from the application Help tab).

  • New in AudioLeak 3 Professional is live 5.1-channel LKFS (BS 1770) measurement and unique "Firefly" input level monitoring
  • Version 3.1 saves analysis results in subfolder inside user's Documents folder instead of subfolder in user's home directory
  • Version 3.1 (Professional) adds option for using integration time constants as fast as 10 ms, and other changes

  • See release notes included with download for all changes in version updates.


System Requirements - AudioLeak is a Universal Binary that runs natively on PowerPC and Intel Macs. Requires Mac OS X 10.4 or later, G4 or newer CPU.
Supports - ITU BS.1770 Leq(RLB) and Leq(R2LB) LKFS units (AudioLeak Professional)


Features AudioLeak Free AudioLeak AudioLeak Professional
Fast Analysis of Audio File Levels yes yes yes
Real-Time Audio Input Level Measurement yes yes yes
Measures Peak Levels, Unweighted / A-Weighted Leq yes yes yes
44.1 to 384 kHz, 8/16/20/24/24/32/64 Bits yes yes yes
Multiprocessor / Multicore Aware yes yes yes
Mac Universal Binary (PowerPC and Intel) yes yes yes
Graph Peak Levels, Unweighted / A-Weighted L+R Leq yes yes yes
2-Channel A-Weighted Leq & Peak yes yes yes
Manually Save Graphs (command-S) as TIFF or JPG yes yes yes
Graph Leq Left, Right, L+R, eMono (Selectable) yes yes
Peak, RMS Unweighted / A-Weighted Histogram (Selectable) yes yes
2-Channel (plus Leq / LKFS) "Firefly" Input Level Meter yes yes
Process / Auto-Normalize Files (Save with Changed Levels) yes yes
Stamp Graph with Tabular Measurement Information yes yes
2-Channel LKFS Loudness (RLB/R2LB), 44.1 to 384 kHz yes yes
Automatically Save Graphs (Real-Time and File Analysis) yes
Automatically Save Tabular Measurement Data yes
Batch File Analysis and Processing yes
Recognize (Right) (Left) Mono Input File Pairs yes
Variable Integration Time Constant (TC 1 to 120 seconds) yes
Adjustable Input Level Gating Threshold & Hold-Off yes
5.1 Channel (plus Variable TC) "Firefly" Input Level Meter yes
5.1 Channel Surround LKFS (for Live Audio Input) yes