hitjam.io
A real Martin steel-string acoustic guitar, one plucked note per key.
No MIDI keyboard? Play with your computer keys: bottom rows are the lower octave, top rows the higher one. Hold Shift to sustain. ← → octave, ↑ ↓ semitone.
Virtual guitar
The notes are recordings of a real Martin HD-28, the classic steel-string acoustic guitar, from the low E string up to high on the neck. Each key plays one plucked note, so you play melodies and riffs, not strummed chords.
Plug a controller in and the guitar's full range is there at once, from the low E string to the top frets. Lift the key and the string stops, like a hand resting on it.
No guitar app, no plugin and no account. Pick out a riff, record it, and keep the WAV, which is made on your own device.