Frequency Display

Frequency Display listens through your microphone and shows the main frequency of the sound around you, live, in hertz. It also shows the nearest musical note and a full spectrum from 20 Hz to 20 kHz. USEFUL FOR • Checking the pitch of a voice, a whistle or an instrument • Finding the frequency of a hum, a buzz or a tone from a speaker • Testing a tone generator, a speaker or a microphone • Science and physics classes about sound WHAT YOU SEE • The frequency in Hz, in large numbers you can read from a distance • The nearest musical note and how many cents sharp or flat it is, for example A4 +0¢ • A live spectrum on a logarithmic scale, with the main frequency marked • A level meter, so you know when the sound is loud enough to measure FINE-TUNE THE MEASUREMENT • A4 reference pitch from 415 to 466 Hz (440 Hz by default) • Minimum and maximum frequency to focus on the range you care about • FFT size from 1024 to 16384 samples, with the resulting resolution shown in Hz • Sample rate from 8 kHz to 48 kHz • Silence threshold, pitch smoothing and how fast spectrum peaks fall • Reset everything to the defaults with one tap CHOOSE YOUR INPUT • Pick the audio source, including an unprocessed (raw) source on devices that support it • Use the built-in microphone, a wired headset, a USB microphone or a Bluetooth input MAKE IT YOURS • Light and dark themes, or follow the system • Seven main colors, or your wallpaper colors on Android 12 and newer PRIVATE BY DESIGN • Sound is analyzed in memory on your device. It is never recorded, saved or uploaded • No account or sign-in • Measures without an internet connection Frequency Display is free and shows a small banner ad.