Free is a real advantage until the week it is not
Knowt's free tier is genuinely generous, and for a light term it may be all you need. The strain shows in the two weeks before finals, when you are generating material for five courses at once and every other student is doing the same. Hitting a cap in that window is not a minor inconvenience; it is the tool becoming unavailable at the exact moment it was supposed to earn its place. NoteLinkAI is a paid subscription and does not ration generation, which is a worse deal in October and a better one in December.