Most piano apps require a download. The Ultimate Piano runs entirely in your browser — play instantly with your MIDI keyboard, mouse, or touch. Stand-out feature: create piano chord charts for teaching materials. Highlight notes, add fingering numbers, use two colors to show chord structure, and export as PNG up to 4x resolution. Generate full chord progression diagrams in one click. Also: ear training, falling notes, OBS streaming overlay, and metronome with speed training.