RTA · SPL meter · Spectrogram

See the sound
you're hearing.

Spectrum Eye turns your iPhone or iPad into a live real-time analyzer — a high-resolution spectrum, an IEC-style SPL meter, and a scrolling spectrogram, all from the built-in mic or your audio interface.

See what it does

iPhone & iPad · Audio is analyzed on your device, never uploaded.

Spectrum Eye running on an iPad in light mode and an iPhone in dark mode, both showing a live spectrum and SPL readout.

Built for the gig

Measurement-grade tools, one tap away.

No project files, no setup screens. Open the app and the room is already on screen — then tighten resolution, weighting and ballistics until the answer is obvious.

1/1 – 1/96 oct

Three ways to look

Classic bar graph, smoothed line with fill, or spectrogram. Switch views without losing your place.

dBA · dBC · dBZ

Real SPL meter

IEC-style Fast, Slow and Leq ballistics with A/C/Z weighting, peak hold and per-route calibration.

On device

Honest input

Measurement mode bypasses iOS voice processing — no hidden high-pass, no limiting. Import your mic's correction file.

Resolution: up to 1/96 octave
Weighting: A / C / Z
Ballistics: Fast / Slow / Leq
Stimulus: pink noise built in

See frequency over time

The spectrogram catches what a meter misses.

Rumble that comes and goes, a ring that only blooms on certain notes, an HVAC cycle behind the mix — the scrolling heat map shows it. Slide the cursor to read exact Hz and dB at any point, choose your palette, and set the min/max that matter.

All analyzer options

Spectrogram view in Spectrum Eye showing a colour heat map of frequency against time with a cursor readout of 723 Hz. — Spectrogram, landscape, default palette.

Know before it hurts

Alerts when you approach the limit.

Set a yellow warning and a red limit per frequency weighting. The readout takes over the screen as levels climb, so you can see the number from behind the console — or from across the room.

How the SPL meter works