Know what to study next.
Most study apps hand you an answer and forget you existed. Studly watches how you solve, remembers what you struggle with, and uses it to tell you what to work on next.
Before it answers, it shows you what it read — so a misread digit gets caught before it becomes a wrong answer. Where the mathematics can be checked, it is checked with a real solver, not a second opinion from the same AI that produced the answer. And when there isn't enough evidence to say how well you know something, it says that instead of inventing a score.