Frequency Display

DigitalSolutions

Contains adsIn-app purchases

About this app

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.