About SATOpen

SATOpen exists so every student can prepare seriously for the Digital SAT without paying for it. Everything on SATOpen is free: lessons, practice, explanations, vocabulary and full mock tests.

• A 29-question diagnostic — one question for each of the 10 Reading & Writing and 19 Math skills — sets your starting point.
• Learn explains each skill; the Practice path moves you from learning to mastery with immediate five-layer explanations.
• Mastery checks confirm when a skill is truly mastered, and your dashboard shows real progress for every skill.
• Full-screen mock tests with Desmos, a reference sheet, highlighting and answer elimination give you test-day practice.

SATOpen stays free. If it helps you, you can support hosting and new content with a small contribution, or simply tell us what to improve through the contact form.