PianoChord.io will always be free and open source. The motivation of this project is to provide music lovers, students and educators an easy-to-use tool to visualize and learn common piano chords. We insist on high bar of user experience, mobile friendliness, and most importantly, the correctness of the data.

Don't hesitate to report a bug if you find we have the wrong chord data or anything else goes wrong. Feature requests are also welcomed! To do so, please open an issue in Github Issues.