For an app I was thinking of a desktop application, similar to the Notion app. I love browser things, but having a desktop app helps with multiple desktops and application switching. For mobile I could see a viewer for whiteboards being useful and a doc editor could be helpful. But the big gain is on Tablets (iPad, Chromebook, Android Tablets) where full functionality is helpful and a native app offers options for "Share To" and access to local photos.
If I try to do any basic operations that involve the rich text editor on the Aha website on mobile (adding comments, creating stories with description field and tagging users with @), it doesn't work and the rich text editor is impossible to use (on android chrome)
Along with that, the mobile app is pretty much useless
... So basically using Aha on mobile is not feasible