Yes, it’s the same idea with (a lot) more configurability, and with the MIDI trigger input that’s so maddeningly lacking for GarageBand’s smart instruments. There are a lot of features I’ve never used (such as what looks to be a very powerful system of custom MIDI control messages), but the basic setup is that chords of your choice are mapped to up to 128 pads which you can then trigger with MIDI notes in chromatic sequence starting at your choice of four octave points. Each chord can have its own strum preset – up, down, random, or off – and spacing between strummed notes.
Chord sets can be saved in-app in named presets. If you’re never going to use more than twelve different chords in a single preset, all you need to set up in the Artiphon app is a pad preset spanning a chromatic octave from the C of your choice – though in grid mode there are up to 78 different chords triggerable from a single I1 preset (and that’s without using the capo buttons, which can open up several more octaves of triggers if needed).
It’s obviously not quite going to give you the control full autochording with strum would, because you can’t omit any notes/strings from the chord. But if you just want something that will replicate the GB smart instruments on a physical instrument, it does the job very well – and you can map the MIDI out to any app you like.
The documentation is a bit sparse and the online videos rather tangential for I1 users (they’re mainly geared to using ChordPolyPad to control external devices, rather than vice-versa), but if you play around with the built-in sounds and presets you’ll get the idea fairly quickly.