Decibelion is an instrument tuner but with the unique feature of displaying the note on a music staff. This is particularly helpful if learning a musical instrument as you can *see* what notes you're playing and how in-tune you are.
The app uses the device's microphone to detect a music note, and it shows the detected note on a music staff. With the note, it provides some visual cues about whether the note is being played in tune or out of tune so that the app's user can more effectively learn to distinguish an in-tune sound and ultimately play their instrument better. I hope the app helps someone learn the violin or guitar or something. For me, I'm learning the violin, and the app has been helping me a lot. I use the app myself.
Say good-bye to guess-work at what note you're playing on your instrument and whether or not that fingering is in-tune or not. The "music mic" page of the app shows you all the information you need. On the music staff on that page, a green fully-filled-in note means you're in-tune. A red note with only its bottom-half filled in means you're out-of-tune flat. A blue note with only its top-half filled in means you're out-of-tune sharp.
The music staff supports switching between the treble, bass, alto, and tenor clefs, and it supports displaying the note an octave higher or lower (8va notation). The key signature can be cycled through all the major and minor key signatures that are available in music theory without resorting to double sharps or double flats.
The triangles above and below the music staff allow for cycling through these options, and clicking on the key signature toggles between the major/minor key.
In addition to the music staff which in portrait orientation bends down and connects to the keyboard at the bottom of the screen, the music mic also indicates the note name either in simple (G, F#, A, etc.) or scientific pitch notation (G3, F#4, A5, etc.). The keyboard at the bottom displays the piano key to which this note maps. The middle C and the A-440 piano keys are marked with a small circle dot for reference.
There are no ads; who likes ads, anyway? But the "music mic" screen does have a 30 minutes per day "daily demo" time limit which can be unlocked for unlimited daily use by making a one-time in-app purchase. Otherwise, the app may be used for 30 minutes per day for free indefinitely with no limit on the number of days. And if you never ever pay for the app but the 30 minutes per day still helps you learn, great! I'll be happy even if people don't buy the app but the app helps someone learn music.
The Decibelion app also has a regular "tuner" screen that can be used as a violin or guitar tuner. The tuner screen shows the detected pitch (in Hz), the scientific note name, and a tuner dial of how many cents sharp or flat. The regular tuner screen is free to use without any runtime restrictions or purchase paywalls.
Finally, there is a "math mic" screen that shows the mathematical spectrum plots of the microphone audio. This screen can be used by audio engineers or by students or teachers who are learning about audio spectra and harmonics in music.
I hope you enjoy the app, and thank you for your time and consideration!
