Soundwave: Scope & Spectrum

Soundwave — a professional audio oscilloscope and spectrum analyzer that fits in your pocket.

Point your phone at any sound source and watch it come alive: Soundwave turns your microphone into a real-time instrument — a precise oscilloscope for the time domain and a full-featured FFT spectrum analyzer for the frequency domain. Whether you are an acoustics student, an audio engineer, a maker tuning a circuit, or just curious about the sounds around you, Soundwave brings pro-hardware tools without the pro-hardware price.

Oscilloscope

• 40 kHz / 16-bit capture with an ultra-low-latency trace on a crisp 10 × 6 grid.

• Pinch to zoom, pan, and drag two markers to read exact time intervals, peak values and amplitude differences (ΔX / ΔY).

• Advanced trigger with rising/falling edge and AUTO / NORMAL / SINGLE run modes to stabilize and freeze repetitive waveforms.

• Peak-hold envelope, Y-axis offset and zoom, with readouts in percentage or dBFS.

Spectrum Analyzer

• Radix-2 FFT from 512 to 32768 points; 4096 display bins covering 20 Hz–20 kHz.

• Five FFT windows (Rectangular, Hann, Hamming, Blackman-Harris, Flat-top) with resolution-bandwidth (RBW) readout.

• Logarithmic or linear frequency axis, adjustable reference level and dB span.

• Spectrum peak hold plus auto peak-find and next/previous peak navigation for fast harmonics analysis.

Spectrogram (Waterfall)

• A scrolling 5-second waterfall history in five color themes (Jet, Ocean, Inferno, Viridis, Green) shows how the spectrum evolves over time.

Signal Generator

• Built-in multi-tone synthesizer, up to 20,000 Hz per row: add, edit and delete frequencies with precise numeric input.

• Real audible output or silent simulated mode; per-tone phase continuity means no clicks when sweeping.

• Gain control with an output-clip (OUT CLIP) indicator, plus optional component-curve overlays.

Real-time Measurements

• Frequency (zero-crossing interpolation), period, Vpp, Vrms and dBFS, refreshed ~10× per second, with a 1-second min/avg/max statistics window.

Capture, Share & Customize

• Snapshot the screen in one tap: share a branded PNG or save it to your photo gallery.

• Six instrument themes and 11 languages.

• Choose your input microphone — including Bluetooth mics on Android 12+ — and read the actual sample rate, bit depth and buffer size.

Ad-free. Soundwave contains no ads. Core features are free forever; Soundwave Premium unlocks the full pro experience: unlimited signal-generator frequencies, FFT windows, RBW, reference level, spectrum peak hold, waterfall themes and more.

Microphone access is used only for real-time on-device analysis. No audio is ever recorded, stored or transmitted.