Offline on the device grammar check/grammar improvement function
Right now I use Typewise to write and Grammarly to check for errors. Although Grammarly has the best grammar check it needs its server and is always online, which I hate as it not only breaches privacy but also makes it less reliable. It is also extremely expensive and has no lifetime purchase but I have no interest to subscribe to anything, one-time purchase or nothing. So if you could implement all the free and paid Grammarly features with a similarly great user interface with the same or better quality grammar check/grammar improvement but everything is completely offline. Then you could increase the one-time purchase price of Typewise to $50 easily.
This is probably the number one feature every keyboard should have but for some reason does not have.
"Offline on device grammar check" (suggested by Nik on 2022-04-11), including upvotes (1) and comments (0), was merged into this suggestion.