HDpiano is described as 'is the Home of The Hybrid Piano Lesson. A merger of game-like graphics and one-on-on expert instruction, HDpiano is being viewed once every second on YouTube, making them the leading piano tutorial provider on the web. More at HDpiano.com' and is an website in the Audio & Music category. There are four alternatives to HDpiano, not only websites but also apps for a variety of platforms, including Android Tablet, iPad, Mac, Windows and Wine. The best alternative is Synthesia, which is free. Other great sites and apps similar to HDpiano are Flowkey (Freemium), PianoBooster (Free, Open Source) and La Touche Musicale (Freemium).
flowkey helps you become the pianist you always wanted to be. Whether it's learning to play your favourite piano songs, starting from scratch or developing your skills – flowkey will show you exactly how to play each note and guide you with instant feedback.
Piano Booster lets you practice and play the piano alongside a scrolling music stave. It's an open-source, cross-platform tool that works with MIDI keyboards as input. Play along and receive an accuracy reading to let you know how you're doing.