CuriousLM

CuriousLM is a free AI app that runs the model on your phone or computer, so your chats are written and kept there, encrypted. No account, no chat server. Words the model was unsure of stay underlined: tap one to see what else it nearly said, and take the answer another way. Voice and Pocket Wikipedia run on the device too, and on Android it can tell you who is waiting on you, with your permission.