Hi-Fi Room Planner — Acoustic Analysis

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About Hi-Fi Room Planner

Hi-Fi Room Planner turns your iPhone or iPad into a portable acoustic measurement lab. Scan your listening room in 3D with LiDAR, measure reverberation and frequency response with a sine sweep or a clap, analyze speaker-boundary interference, and generate a FIR correction filter — all on-device, no cloud account required.

Main features

Compatibility & requirements

Hi-Fi Room Planner runs on iPhone and iPad with iOS 17 or later. Some features depend on hardware capabilities:

Room scanning

Acoustic measurement

Premium features

A one-time in-app purchase unlocks sine sweep measurement, detailed acoustic metrics, treatment panel suggestions and FIR filter generation. No subscriptions.

Frequently asked questions

Which iPhones and iPads can scan a room?

Room scanning uses Apple's RoomPlan framework, which requires a device with a LiDAR scanner. This includes iPhone 12 Pro, 13 Pro, 14 Pro, 15 Pro, 16 Pro (and their Max variants), and iPad Pro models from 2020 onward. On devices without LiDAR you can still use the measurement features with a manual or placeholder floor plan.

Do I need an external microphone?

No. The built-in iPhone microphone works well for most measurements, with an included compensation curve. For higher accuracy — especially at low frequencies and for RT60 per octave band — a calibrated measurement microphone such as the miniDSP UMIK-1 produces more precise results. The app supports USB class-compliant mics directly and can import per-unit calibration files.

What is the difference between the sine sweep and the clap test?

The sine sweep plays a logarithmic chirp through your speaker system and deconvolves the recorded signal into a full impulse response. It gives the most detailed analysis: RT60 per octave band, frequency response, early reflections, flutter echo, SBIR dips. The clap test is a quick alternative: clap once near the iPhone and the app estimates broadband RT60 and flutter echo from the decay. It's fast and needs no speaker, but it can't produce a frequency response.

Can I use AirPlay speakers for measurement?

Yes. AirPlay is actually the recommended output for the sine sweep, because it lets you place your iPhone at the listening position while the speakers stay at their normal location. The app pre-configures the audio session so the AirPlay picker is available, and detects the route automatically to adjust sweep parameters.

How do I add a USB microphone profile?

Plug the USB mic into your iPhone (via USB-C or Lightning adapter). Open the sine sweep measurement screen, tap the "+" button next to the microphone picker, choose the mic type (UMIK-1, UMIK-2, iMM-6, generic USB…), give it a name and optionally import a calibration file (text format from miniDSP or similar). The profile is then available in the picker and the recording indicator will confirm when iOS is actually using it.

What is the FIR correction filter and how do I use it?

After a sine sweep measurement, the app can compute a FIR filter that corrects your room's frequency response toward a target curve (flat or a gentle "house" curve). The filter is exported as a 32-bit float WAV file that you can load into convolution engines such as Roon, Audirvana, camilladsp, JRiver or a miniDSP OpenDRC — anywhere that accepts a WAV impulse response for convolution.

Why does the clap test always use the iPhone built-in microphone?

The clap test needs to detect a sharp transient right next to the iPhone, so the built-in mic — which is physically close to where you clap — is the most reliable input. iOS also has a technical constraint on input-only audio engines that makes USB-mic routing unreliable for this specific path. The app states this clearly in the clap test setup screen.

What is the difference between the Free and Premium versions?

The Free version includes room scanning, the 2D floor plan, the clap test and basic acoustic hints. Premium — a one-time in-app purchase — unlocks the sine sweep measurement, detailed acoustic metrics (RT60 per band, frequency response charts, SBIR analysis), treatment panel recommendations and FIR correction filter generation. No subscriptions: buy once, use on all your devices signed in with the same Apple ID.

Does the app collect any data about me or my room?

No. The app runs entirely on-device. Room scans, measurements and filters are stored locally in your app's sandbox. There is no account, no analytics, no tracking and nothing is ever sent to our servers. See the Privacy policy below for details.

I hear a buzz or artifact on AirPlay at high frequencies — is it my system?

A sine sweep is a stress test for any playback chain. Some older AirPlay receivers (for example, AirPort Express 2) can introduce audible artifacts on high-frequency pure tones due to their internal DAC or clock characteristics. The artifact is in the playback chain only — it does not affect the measurement result, which is captured by the microphone independently. If it bothers you during listening, try a different AirPlay receiver or wired output.

Troubleshooting guide

If a measurement fails or a feature doesn't behave as expected, try the following:

  1. Make sure the room is as quiet as possible during the measurement. Fans, HVAC and traffic can raise the noise floor and make RT60 or low-frequency readings unreliable.
  2. For the sine sweep, place the iPhone at the listening position (ear height) and keep the room empty during the 5-second sweep. AirPlay to your normal speakers is recommended.
  3. If room scanning doesn't start or ends prematurely, check that your device has a LiDAR scanner and grant camera + motion permissions. Good uniform lighting and walking slowly around the perimeter improves the result.
  4. If a USB mic is not picked up, open the mic picker, tap "+" and create a profile for it. The "Recording from" indicator tells you which input iOS is actually using. A red banner appears if the selected profile is not physically connected.
  5. If you cannot select AirPlay as output while a USB mic is attached, this is an iOS limitation: USB audio class devices take priority on the output side. Unplug the mic briefly, pick the AirPlay receiver, then plug the mic back in.
  6. If the measurement result shows unreasonable RT60 values, increase the volume, move the iPhone away from the speaker and check that the pilot tone before the sweep is audible.
  7. Premium features missing after purchase? Open the paywall and tap "Restore Purchase" with the same Apple ID used for the original purchase. The app also re-checks entitlements automatically when it returns to the foreground.
  8. If the issue persists, contact support — see below — and include your device model, iOS version, measurement mode, microphone setup and a short description of what you observed.

Contact support

Couldn't find an answer? Have a feature request or a bug to report? We're happy to help.

Email support

iphonesmartapp@gmail.com

We typically reply within 2 business days. To help us respond faster, include your app version, device model, iOS version, measurement mode and microphone setup.

Privacy policy

Last updated: April 19, 2026

Hi-Fi Room Planner is designed with privacy in mind. The app runs on-device and does not collect, store or transmit any personal data about you.

Data we collect

None. Hi-Fi Room Planner does not collect any personal data, usage analytics, crash reports or identifiers. No account is required to use the app.

Data stored on your device

Your room scans, acoustic measurements, microphone profiles, calibration files and generated FIR filters are stored locally in the app's sandbox on your device. They are not synchronized to our servers or to iCloud. You can delete any project from within the app, or remove all data by uninstalling the app.

Data we transmit

Nothing to our servers. The app only accesses the microphone and speaker locally on your device. AirPlay playback goes directly from your device to your own AirPlay receiver on your local network.

Third-party services

The app uses Apple's RoomPlan framework for 3D room capture (processed entirely on-device), Apple's AVFoundation for audio measurement, and Apple's StoreKit to process the optional one-time Premium in-app purchase. These frameworks are provided by Apple and are covered by Apple's Privacy Policy. Hi-Fi Room Planner integrates no analytics, advertising, tracking or social SDKs.

Permissions

The app requests access to the Camera (for LiDAR room scanning) and to the Microphone (for acoustic measurement). Both permissions are used only when you actively start a scan or a measurement, and only on-device. You can revoke either permission at any time in iOS Settings.

Your rights

Since we do not collect personal data, there is nothing for us to access, correct or delete. You can remove all Hi-Fi Room Planner data at any time by deleting the app from your device.

Contact

Questions about this privacy policy? Write to ISALabs at iphonesmartapp@gmail.com.