A chromatic tuner built in vanilla javascript using freelizer, which implements a noise gate and bootleg noise cancellation
Freelizer already came with the ability to identify notes, but to keep it challenging I removed all parts of freelizer that didn't identify the frequency of mic audio. I also added a few lines to determine volume levels which let me make the noise gate.
This is what the page will look like when you load it in your browser
After you allow microphone use and play a consistent note, the tuner will activate
If the note is not consistent, meaning the frequency is fluctuating more than 1hz, the note will not be detected. If a consistent note is detected, then the note name will be displayed and the accuracy of the note will be displayed through the moving red line.