Chordbot is described as 'music app that lets you create and play complex chord progressions quickly and easily' and is an app in the Audio & Music category. There are seven alternatives to Chordbot for a variety of platforms, including Mac, Windows, iPad, Linux and Online / Web-based. The best alternative is Captain Chords. It's not free, so if you're looking for a free alternative, you could try Hookpad. Other great apps like Chordbot are Arpado (Paid), Harmony Builder (Paid), ChordPad (Paid) and Chordjam (Paid).
Arpado is a Music Composition Software which controls hardware or software instruments through MIDI. It features an advanced arpeggiator, music theory, chords, scales and a unique Progressive Sequencer.
Described as chord sequencer it lets you quickly create chord progressions, play them in many styles, transpose, adjust tempo, change instruments. Great for practicing. I used it for improving my scales on guitar and I have to tell it is amazing.