SPLnFFTviewer
Can visualize the data exported from the iOS App to your Dropbox directory.
SPLnFFT Viewer is a companion tool for the iOS App "SPLnFFT Noise Meter". Data exported from iOS App to your Dropbox directory can be visualized here, and the input binary files are expected to be found at the default Dropbox location, though you can specify another directory. What is important is to confirm the location ("Open") to allow read/write to this directory.