Email us with your device model and iOS version — we usually reply within 1–2 business days.
Yes. The microphone is the App's core sensor — it's how every instrument measures sound. Audio is processed live on your device and is never recorded, stored, or sent anywhere. See our Privacy Policy for details.
Open iOS Settings → Privacy & Security → Microphone, find Audio Spectrum Pro, and turn it on. (Or Settings → Audio Spectrum Pro → Microphone.) Then relaunch the App.
Check three things: (1) the iPhone silent/ring switch isn't muting output, (2) the volume is up, and (3) audio is routed to the speaker or the headphones/interface you expect. The generator plays through the current output device while the microphone keeps analyzing.
Open the RT60 tab, tap Start, then create a sharp impulse — a hand clap, a click, or let the built-in sine sweep play. The App captures the decay, computes T20, and extrapolates RT60, with a plain-language verdict from “very dry” to “reverberant”.
Pitch is detected to hundredths of a cent. Tap the settings control in the Tuner to adjust the A4 reference (e.g. 440 / 442 / 444 Hz), enable a capo offset, or pick an instrument preset. A noise gate helps reject bleed from a loud PA.
Audio Spectrum Pro is a professional field tool, but it uses the iPhone's built-in microphone, which is not a calibrated reference mic. Readings are highly useful for relative measurements, troubleshooting and tuning — treat absolute SPL/RT60 figures as accurate estimates rather than certified lab values.
The interface is available in English, Russian and Ukrainian. The App runs on iPhone and iPad with iOS 16.2 or later, and supports landscape orientation so you can lay it on the meter bridge.
No subscriptions and no account. You don't sign in, and nothing about you is collected.
Email popravkin@croscor.com and include your iPhone/iPad model, iOS version, and a short description (a screenshot helps). We read every message.