Is it possible to buy a plan for someone else?

If not, please add it. I want to buy a plan for my teacher.

No, but you can have your teacher sign up with Kami Rewards, which will get them a 4-month free trial of Kami’s Teacher plan.

Edit: Please note however that you must use this with a teacher role on your account. (Click the “Student” button at the top of the screen and click “Teacher” in the window that appears, but don’t worry about LMS integration). Also do this to change the role back to Student when you are done.