The blues generator writes from the Mixolydian scale the style actually lives in, not a plain major key, so the flattened seventh lands in melodies and chords without any hand-editing.
Blues is included with the Pro and Studio plans; the free plan covers five genres. See pricing.
How the engine writes blues
Expect a shuffling pocket at 100 BPM, call-and-response phrasing in the lead, and a bass that walks rather than pumps. The chord lane sticks close to the familiar cadences, which keeps every roll sounding like blues rather than blues-flavoured pop.
From a roll to your DAW
A roll defaults to 100 BPM (every preset and tempo is editable before and after generating) and plays back in the browser through the studio's own synths. When you like a take, export it as whole-track or per-instrument MIDI, or as WAV/MP3 audio — the drum part uses General MIDI numbering, so it lands correctly on any drum plugin. There are step-by-step import guides for Ableton Live, FL Studio and Logic Pro.