Professional Audio Toolbox

Professional Audio Toolbox puts sixteen tools for sound engineers, acousticians and musicians in one app. One purchase covers iPhone, iPad and Apple Watch. No subscription, no ads, no account, and no audio ever leaves your device. MEASURE • SPL Meter: A, C and Z frequency weighting, Fast, Slow and Impulse time weighting, Leq, Lmin, Lmax and C-weighted peak, with a clipping warning. • Spectrum Analyzer (RTA): octave, 1/3-octave and 1/6-octave bands on IEC centre frequencies, averaging and peak hold. • Spectrogram: frequency over time on a logarithmic scale, with adjustable range. • Oscilloscope: triggered waveform, timebase and gain, frequency readout. • Loudness Meter: momentary, short-term and integrated LUFS following ITU-R BS.1770, loudness range, true peak, and targets for streaming and broadcast. • Goniometer: stereo vectorscope and phase correlation meter for stereo inputs. PLAY • Tuner: needle and strobe displays, cents and hertz, adjustable A4, and 18 tunings for guitar, bass, ukulele, violin family, mandolin and banjo. • Metronome: sample-accurate clicks, per-beat accents and mutes, subdivisions, polyrhythms, tap tempo and setlists. • Tone Generator: sine tones with A440 and A432 presets, linear and logarithmic sweeps, white, pink and brown noise. • Chords and Scales: circle of fifths, keyboard and fretboard views, scale harmonisation, playable chords. • BPM Detector: hears the tempo of the music around you. • Piano: a polyphonic keyboard for finding a note or a starting pitch. LIVE SOUND • Feedback Finder: shows the frequency that starts to ring, its nearest note and how fast it grows. • RT60: reverberation time from a balloon pop or a clap, with T20, T30 and EDT. • Delay Calculator: distance and air temperature to milliseconds and samples, metric or imperial. • Polarity Test: plays a test pulse and tells you whether a loudspeaker is in polarity. MADE FOR REAL WORK • External audio interfaces and measurement microphones are supported; choose the input in Settings. • Import your microphone's calibration file to correct the SPL meter and the analyser. • Set an SPL offset against a calibrator or a reference meter. • Dark interface designed for stages and studios, with full light mode for daylight. • iPad layout with the tool list beside the tool. ON APPLE WATCH SPL meter, tuner, metronome with haptics, tone generator, BPM detector, 1/3-octave analyser, delay calculator and piano. The watch app works on its own, and shared settings follow you between devices. A NOTE ON ACCURACY Phones and watches are not certified sound level meters. Without calibration, absolute levels are indicative. With a calibrated measurement microphone and an SPL offset, the toolbox becomes a dependable companion, but it does not replace a certified Class 1 or Class 2 instrument where regulations require one.