PrepStar: SAT & ACT prep that studies you back.

PrepStar is an AI-native study app for the SAT and ACT. It finds the pattern in your mistakes, generates more of exactly what you miss, and explains every answer until it clicks.

Mistake analysis, not just scores. We tell you which habit cost you the points, and drill it.
Endless targeted practice. Miss a question and get fresh ones shaped just like it.
Paper when you want it. Print a full timed exam, then photograph it to have it graded.

What PrepStar does

Students take a diagnostic, then work through a daily plan of lessons, practice questions and full-length timed exams that PrepStar builds around the skills that move their score most. Every question comes with a thorough explanation, and progress is reported to students and their parents. The app runs at app.prepstar.ai.

Signing in with Google

PrepStar offers sign-in with Google as an alternative to a one-time code by email. When you choose it, PrepStar receives only your name, email address and profile picture, and uses them to create and identify your account. We do not post on your behalf or read anything else in your Google account. Details are in our privacy policy.

Launching for the 2027 test season. Questions or partnership enquiries: hello@prepstar.ai