SpectraHold vs HandsFreeCheck

The spectrogram with memory. SpectraHold turns microphone input into a 3D spectrogram. Watch frequencies in real time, freeze the view, and explore up to 120 seconds of visual history to inspect a detail you just heard. FREEZE AND EXPLORE Tap the graph to inspect a frequency. Zoom and browse the history, then return to live analysis whenever you want. ADJUST THE VIEW Choose a visible window from 1 to 20 seconds, color palettes, and automatic or manual visual gain from −40 to +40 dB. Visual gain changes the graph without changing microphone gain. FEATURES • Real-time 3D spectrogram from 20 Hz to 20 kHz. • Adjustable history from 20 to 120 seconds. • Frequency inspection, zoom, and history navigation. • Up to two estimated peaks per region: bass, midrange, and treble. Detection does not confirm resonance. • Background capture and capture with the screen locked, while permitted by the system. • Compatible with iPhone and iPad. Audio is processed on your device. History stays in memory; no audio file is saved or uploaded. Closing the app or a system interruption may stop capture. TRIAL AND PURCHASE Download for free. Activate a free 7-day trial to access all features. After the trial, analysis stops until you purchase full access. The unlock is a one-time purchase, with no subscription or automatic charge. The local price is shown before you confirm the purchase. You can restore purchases. SpectraHold is a visual analysis tool. It does not apply equalization, automatically eliminate feedback, or replace a calibrated sound pressure level meter. Estimates depend on the microphone, device, and recording conditions.

Check your Bluetooth headset's microphone and speaker with a continuous live audio loop before a call. HandsFreeCheck sends the microphone signal back to your headset while displaying separate microphone and speaker waveforms with dBFS levels. Features • Live Bluetooth hands-free microphone monitoring • Separate microphone and speaker signal displays • Input and output device names • Adjustable monitoring level • Pause and resume • Automatic connection handling Audio is processed on your device. Nothing is recorded or uploaded. No account, ads, or subscription. Connect your headset in Bluetooth settings, open the app, allow microphone access, and speak. The app requires a Bluetooth Hands-Free Profile (HFP) device with both microphone and speaker support, including compatible AirPods. Without a compatible device, the app waits for a connection. Bluetooth monitoring introduces some delay. The speaker trace shows the app's digital output, not an acoustic measurement. This is a live communication-route check, not an independent left/right speaker test. A later phone call may select a different audio route. Compatible with iPhone and iPad running iOS 15 or later.