The 'Speccy - Spectrum Analyzer' app, available on the Google Play Store here, does not collect or store, or transmit any private user data.
The app's online required permission, microphone access is needed for the core functionality of the app only (analyzing audio spectrum data). The app currently asks no external file system access, as such it cannot store anything recorded by your device's microphone and does not require internet access, so cannot transmit anything. If you want, you can run the app in 'airplane mode' to ensure it cannot transmit any data.
Learn more about the Speccy - Spectrum Analyzer app.
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