Just Add This Piece Of Code To Your Site
<iframe style="border: 0;" src="https://notes.matchmysound.com/tuner.html" width="250" height="250" seamless="seamless"></iframe>
You can change the size of it if you like. The only condition of using this for free is that you can not remove the MatchMySound™ link. This tuner is designed for the MatchMySound powered auto-grading products like AchieveMusic, dohrey.me, and PracticeFirst. It comes with no warranties! Read about the platforms where it works (scroll down to Platforms). Important: your site has to be loaded over HTTPS.