@paul @jochie I know that some app creators worked around the App Store's inability to offer reduced-rate upgrades by selling a bundle of the old and new apps together -- because the App Store apparently *does* (or did) allow reduced bundle prices if the buyer already owns one app in the bundle. If TB and Ivory were one-time purchases, you could bundle them together to provide a cheaper migration path for TB users. But I don't know if or how that would work with subscriptions.