You don’t need acoustics training to take your first measurement. This walkthrough goes from install to an exported PDF in about five minutes.

1. Install and create a project

Download AcousticCheck from the App Store and open it. Create a project (the job, the building, the client) and a room inside it. Naming things now pays off later — the names end up in your reports.

2. Place the phone

Put the iPhone roughly in the middle of the room, at ear/listening height if possible, at least a meter away from walls and large surfaces. Hold still or prop it up — handling noise ruins decays.

3. Measure

Tap the record button. With the default impulse method, make a sharp, loud sound — a firm hand clap works, a popped balloon works better. The app records the decay and shows the result in about eight seconds: the headline RT60 readout plus the per-band T20/T30 table.

4. Read the result

  • The big number is the reverberation time at 1 kHz — the single most quoted room-acoustics figure.
  • The band pills below switch the readout to other frequency bands.
  • Each band shows an R² fit quality; bands under 0.90 are flagged rather than reported.

5. Export

Tap the share icon → PDF report for a document, or CSV for data. Done.

Next steps — for numbers you’d put in front of a client, switch to the sweep method with a Bluetooth speaker, and read how accurate an iPhone measurement really is.