Generate a progression that actually resolves, or build your own by hand — click any chord to hear it, or play the whole thing in order.
Each generation picks a random key, then threads chords through it using common chord-progression tendencies (things like V→I and ii→V), so consecutive chords tend to lead into one another instead of jumping randomly. "Smoother transitions" additionally favors whichever next chord shares the most notes with the current one — the reason a change like Eb→Cm7 feels gentler than Bmaj7→C#m is that the first pair shares three notes and the second shares none. "Traditional" skips the freeform generator entirely and loops one of a handful of progressions that already show up in a huge share of pop songs (I-V-vi-IV, I-vi-IV-V, ii-V-I, and the like), starting from a random point in the loop.
Root
Quality
Your progression is empty — add a chord above, or pull in whatever's on the Generate tab.
Pick a root and a quality and add chords one at a time in whatever order you like — there's no key or "flow" logic here, it's just raw material. "Add chords from Generate" copies over whatever the generator last produced so you can use it as a starting point and rework it by hand.