I’ve spent a significant chunk of time recently going back through the platform’s core tools and making changes that I think you’ll notice immediately. The Sketchpad, Chord Architect, Diatonic Key Builder, Progression Lab, and Chord Lab have all had substantial work done — not cosmetic tweaks, but the kind of structural improvements that affect how these tools actually behave when you’re working through a harmonic idea at the instrument.
There’s also a new page published today alongside all of this. I’ll let you find it, but it ties directly into the harmony work that runs through most of these tools. If you use any of the five apps regularly, I’d suggest going back in and having a proper look — some of the changes are significant enough that things may work a bit differently than you’re used to, and that’s deliberate.