Signal Path is the most performant spectrum viewing app with beautiful user interface. You can record audio spectrums using microphone or open large recordings containing I/Q data.

Inspect spectrums
Spectrums can be selected using two finger drag gesture. Tapping on histogram reveals amplitude value of the selected frequency bin.

Adjust thresholds
Signal Path automatically expands amplitude threshold range when viewing spectrums. You can also set custom amplitude thresholds if needed.

Keeping file size under control
Signal Path can set a maximum file size for recording after which file is recreated.

Supported interleaved I/Q data formats
Float, int8, int16, int32, uInt8, uInt16, and uInt32

Fast Fourier transform lengths
256, 512, 1024, 2048, 4096, 8192, 16384

Window functions
Rectangular, Blackman, Hamming, and Hann

What’s New

Version 2.0

* Redesigned from ground up
* Additional Fourier transform length: 16384

Ratings and Reviews

syedhali ,

Crashes when creating a new audio recording

Really promising app, unfortunately it crashes when you try to create a new audio recording from the menu. A fix would be greatly appreciated for a $9 app!

Developer Response ,

Thank you for reporting it and I am sorry for encountering this. This issue is fixed in version 1.5.

FL_Tech ,

Can’t open pre-recorded files

Wasn’t clear from the description (since it said "import from any source") but the app won’t import a pre-recorded file. There is no help file, nor documentation. Tried .wav, mp3, and m4p without luck.


Toomas Vahter
1.9 MB

macOS 10.15 or later. Requires iOS 13.4 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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