Tone Audio Analysis vs Audio Spectrum Pro

ToneListen is an audio analysis app for exploring the sound around you — including the near-ultrasonic, high-frequency tones the human ear can't hear. Point your device at any environment and ToneListen analyzes the live audio in real time. It reveals the frequency content of a space and detects high-frequency "tone tags" embedded in nearby audio, music, and media — turning your phone into a portable spectrum analyzer and tone reader. WHAT YOU CAN DO - Analyze any environment: Visualize live sound on a real-time spectrum view and see exactly which frequencies are present, from low rumble all the way up to near-ultrasonic. - Hear tone tags: Detect and decode high-frequency tone tags emitted by speakers, displays, TVs, and other media — including tones above the range of human hearing. - On-device media player: Play tone-safe sample files and watch their spectral content render live, so you can study how tone tags look and behave in different conditions. - Location-aware exploration: Use interactive maps to explore and reference where audio analysis is taking place. HOW IT WORKS ToneListen runs high-resolution frequency analysis entirely on your device. It listens through the microphone only while analysis is active, identifies tone patterns in the incoming audio, and displays the results instantly. Nothing needs to leave your phone for this to work. PRIVACY ToneListen uses the microphone solely for on-device audio and tone analysis. No voice, speech, or ambient audio is ever recorded, stored, or transmitted. Microphone input is processed in real time and immediately discarded. PRICING ToneListen is completely free to use. There are no in-app purchases, no subscriptions, and no paid digital content, features, or services unlocked inside the app. Every feature described above is available to all users at no cost, with no account or payment required. ToneListen is ideal for anyone curious about the sounds and signals in their surroundings — from audio enthusiasts and developers to anyone who simply wants to see and hear what is hiding just beyond human hearing.

A professional audio toolkit for live sound engineers. Audio Spectrum Pro is a complete measurement suite on your iPhone: spectrum analyzer, chromatic tuner, oscilloscope, loudness meter, test-signal generator, and RT60 reverberation time measurement. Everything in one app, with a dark interface built for the stage and the concert hall. SPECTRUM ANALYZER Real-time spectrum from 50 Hz to 16 kHz on a logarithmic scale. Automatic peak detection highlights problem frequencies instantly. The "EQ Suggestions" panel tells you which band to cut and by how many decibels - before feedback ever happens. CHROMATIC TUNER High-precision pitch detection accurate to hundredths of a cent. Supports guitar, bass, violin, viola, cello, ukulele, mandolin, banjo, and a chromatic mode. Adjustable A4 reference, capo support, and a noise gate to reject bleed from the PA. OSCILLOSCOPE Real-time waveform display for signal-integrity checks, phase inspection, and clipping detection. The first thing you reach for when something sounds wrong. LOUDNESS METER Simultaneous RMS and true-peak readout with a scrolling history graph (120 frames). Watch your average level and catch peak spikes before they slam your limiters. TEST-SIGNAL GENERATOR Pink noise, white noise, a logarithmic sine sweep (20 Hz to 20 kHz), or a fixed tone from 50 Hz to 8 kHz - all played through the speaker while the mic keeps analyzing. Tune PA systems, ring out monitor wedges, and find room resonances without a separate signal generator. RT60 REVERBERATION ANALYSIS Tap Start, make an impulse (a clap, a click, or a sine sweep) - the app records the decay, computes T20, and extrapolates RT60. Size up a room's acoustics in seconds and know whether they're working for you or against you. BUILT FOR THE FIELD - Mic gain control with the volume buttons - one hand, while the other stays on the console - Fully dark interface - readable under stage lighting, easy on your night vision - Landscape orientation - lay it on the meter bridge or a side table - Three interface languages: English, Russian, Ukrainian Microphone access is required. A speaker or headphones are needed to play test signals.