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By Faber Acoustical, LLC

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IOScope brings two-channel transfer function and impulse response analysis to iOS! See for video demos.

With IOScope, measure loudspeaker impedance, frequency response, and sensitivity. Measure a room impulse response. Tune a large sound reinforcement system, time-align a set of surround sound speakers, or optimize your home stereo. Determine the actual cutoff frequencies of your latest speaker crossover circuit, or teach your students the fundamentals of Fourier analysis of dynamic systems.

Measure frequency response magnitude and phase, coherence, and group delay. Time domain functions enable you to measure impulse response and auto/cross-correlation. IOScope includes a built-in signal generator for producing suitable excitation signals to analyze your system or device under test (DUT). The reference signal can be taken from the internal signal generator or from an external source (when using an external reference, a stereo or multi-channel audio input device, connected to the dock connector, is required).

IOScope also turns your iOS device into a platform for data acquisition, storing acquired data in CSV or TXT files, MAT-files, or images for later retrieval from your device.

Different engineering units, including Volts, Amps, pascals, g's, and ips (inches per second) can be assigned to input channels of the dock connector audio input or the headset input. Sensitivity calibration can also be performed for any audio input device or input channel.

“Touch” your data with interactive, multi-touch enabled analyzer displays.

IMPORTANT NOTE: For best results, using a dock connector input device is recommended for the highest quality measurements. It is possible to use IOScope with the built-in microphone, but this is not generally recommended.

Visit for important information about iOS device I/O.

- Analyze signals coming from the iOS device’s current audio input path.
- Measure device (DUT) characteristics by analyzing its input (X) and output (Y) signals.
- Measure frequency response magnitude and phase, coherence, and group delay.
- Measure impulse response (IR), squared IR, and cross-correlation.
- Frequency resolutions from 0.2 Hz to 10 Hz.
- Measurement durations from 0.1 to 5 seconds.
- Employ an external or internal reference (X) signal.
- Reference (X) signals include: Internal Excitation Signal, Built-in Microphone, Headset Input, Ch1, Ch2, Ch2-Ch1 (depending on which audio input device is currently selected by the OS).
- Measurement (Y) signals include: Built-in Microphone, Headset Input, Ch1, Ch2 (depending on which audio input device is currently selected by the OS).
- Use cursor peak track to easily measure time delay.
- Apply sample-accurate delay to the reference (X) signal for the highest quality measurements using an external reference (e.g. to compensate for acoustic delay in a sound reinforcement system).
- Audio input is generally sampled at 48 kHz, although some input devices limit that to 44.1 kHz.
- Assign engineering units to your input signals and calibrate external transducers for accurate measurements (this allows IOScope to measure impedance in ohms, or device sensitivities such as SPL/V or V/Pa).
- Save acquired time or frequency data to CSV, TXT or MAT-files.
- Retrieve your data files via iTunes File Sharing, or from your device through a web browser on your Mac or PC.
- Save high-resolution analyzer display images as PDF files, or to the iOS device's built-in photo album.

What's New in Version 5.1.1

Version 5.1.1
- The black color scheme now uses black status bar, toolbar, and tab bar backgrounds.
- Fixed a bug in the menu for loading previous measurements from existing data files on iOS 7.
- Fixed a bug that could result in an invalid value in the highest frequency band with smoothing enabled (only the display values were affected, not the raw unsmoothed data).
- Other minor bug fixes.

Version 5.1
- Line plot trace thickness can now be applied to all graphs within IOScope.
- Improper plotting of frequency data with units of cpm has been corrected.
- Other improvements “under the hood.”

Version 5.0
- IOScope 5 employs a new plotting framework for real-time data graphs and high resolution image export.
- Live frequency response data can now be overlaid on up to 7 frequency response curves loaded from existing data files (CSV, MAT, or text data files exported from the Frequency tab in IOScope).
- IOScope now supports fractional octave band smoothing of frequency response data (1/6, 1/12, and 1/24 octave bandwidths).
- Built in support for iTestMic and iAudioInterface2 from Studio Six Digital.
- Built-in support for automatic downloading of sensitivity data for the Dayton UMM-6 USB measurement microphone.
- Support for drawing directly to an external screen (from iPad) has been removed in favor of screen mirroring, which is handled by iOS.
- Audio hardware input and output options are now presented from a separate toolbar button, which looks like a microphone, on iPad, iPhone 6 and iPhone 6 Plus.
- It is possible to adjust the line thickness of live and loaded frequency response data. The opacity of loaded data can also be adjusted in order to make the live data stand out in the graph.


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This app is designed for both iPhone and iPad
  • $74.99
  • Category: Utilities
  • Updated:
  • Version: 5.1.1
  • Size: 4.8 MB
  • Language: English
  • Seller:

Compatibility: Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch. This app is optimized for iPhone 5, iPhone 6, and iPhone 6 Plus.

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