Synthesia has been discontinued. The top-rated alternative is playsheet, which is free. People also recommend Piano From Above, Piano Marvel, Flowkey and PianoBooster. There's no shortage of Piano Trainers like Synthesia, with more than 25 alternatives for Windows, Mac, the web, Linux and iPhone.
Perfect Piano is a smartphone app designed to teach players how to play and record piano songs of their own using their smartphone. There are many plugins to allow you to change the sound of the piano to things like a guitar, harp, and cello.
China
A modern MIDI and karaoke player for macOS and Windows with synced lyrics, tempo/key controls, playlists, SoundFont support and MIDI routing.
Italy
EU
Keysight is a real-time configurable midi visualization platform powered by Unreal Engine, built for piano-focused streamers and content creators. Beautiful, performance-accompanying visualizations have never been simpler!
HDpiano 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.
A tool to help when learning to play the piano. The notes to play are falling towards the corresponding piano key. It requires a MIDI keyboard.
La Touche Musicale is a web app dedicated to simplified piano learning. With the app, learn piano online without any knowledge of music theory and music sheet reading.
FranceEU
Flashy Synthesia Like Software For Linux,Windows and MacOs - PolyMeilex/Neothesia
Free piano/midi visualizer which can be used to create piano cover videos like Rousseau and Patrik Pietchmann.
SmartMusic is a web-based suite of music education tools and home to the largest interactive and digital music libraries.
United States
Piano Crumbs - The only interactive piano player online. Play along your favorite songs.
A free cross-platform midi file player based on libfluidsynth and Qt.
Piano Trainer is an app designed to help users learn basic piano scales and chords at their own pace using a MIDI or QWERTY keyboard. The app offers two modes: Quiz and Practice. In Quiz mode, users can test their knowledge of the circle of fifths and key recognition.
