An online piano that is worth practising on
Most browser pianos are a row of buttons wired to a sine wave. Modern Piano loads real recorded notes, respects velocity from a MIDI controller and responds to a sustain pedal, which is the minimum bar for an instrument you would actually sit down at. Everything else on the page - envelope, effects, sequencer - exists to keep you there once you have.
One instrument, several sounds
Because the envelope and the effects rack sit in front of the samples, the same instrument covers a natural grand, a soft felt-ish sound, a long ambient pad and a deliberately broken lo-fi keys patch. You do not need a different app for each of those; you need a release control and a filter.
Chords for people still learning them
The eight chord pads cover the C major family - the progressions most songs start life in. They are a shortcut for anyone who can hear a progression faster than they can voice it, and they stay useful afterwards as a way to hold a harmony while the other hand plays.
Part of the GOONS studio
Modern Piano draws on the same 5000-sample library as the rest of the catalog and shares the studio audio graph, so a part recorded here can sit under a drum machine, a sequencer or a vocoder. One subscription covers everything, and a 7-day free trial covers the deciding.