Platforms like Keysight or LaPiano offer robust MIDI visualizers tailored for learning and content creation.

Access to all 150+ built-in songs and the ability to play any MIDI file you find online without time limits.

If the official version is currently outside your budget, you can still make meaningful progress in your piano journey. The free version of Synthesia is not a trial but a fully functional, legitimate way to start learning. It includes over 20 built-in songs and allows you to play any MIDI file, though with some limitations.