The digital SAT hands every student a Desmos graphing calculator — and almost nobody is taught to use it. DesPrep is that training: solve real SAT problems in a live Desmos embed, get told exactly what to type, then watch an expert replay the fastest route.
Skills 1–2 free forever · No credit card · Cancel paid plans any time
What is the solution to 3x + 7 = −2x − 8 ?
Answer review:
Solved in 0:12 · target 30s · 2 expressions
What is the smaller solution to x² + 3x − 28 = 0 ?
Five chances to make a sign error, and none of them is the math you are being tested on.
No factoring, nothing to sign-error, and the answer is a point you can see.
There are 1,235 problems in here, and every one of them has a route like this. Read how the method works, or try the first two skills free →
Here is what happens instead, on every single problem.
A real Desmos calculator opens beside the question — the same one Bluebook gives you. You type, drag and click in it exactly as you would on test day.
Each problem carries a worked method: the reasoning, the formula behind it, and the exact Desmos line to enter. Stuck is a state you can leave.
After you answer, the fastest path replays step by step against your own attempt — with your time next to the target, so you can see where it went.
Practice alone only tells you what you got wrong. Every one of the 19 skills also has a written lesson — what the College Board is really testing, the fastest Desmos route through it, and the mistakes that cost the marks.
How often the skill appears in the 44 questions, what it is worth, and what being slow at it actually costs you later in the module.
The method, with the exact keys — including the ones the instructions usually leave out, like the arrow that gets you back out of a fraction.
Every wrong answer choice on the SAT is built from a real mistake. Each lesson names the ones this skill invites, and how to not make them.
A few questions to answer before you start, with the answers hidden until you commit. Fresh questions, so they do not spoil the practice set.
Free to read, from the moment you sign up
An equation asks where two expressions are worth the same. Graph the left side and the right side as two separate lines, click where they cross, and read off the coordinate the question actually asked for.
12 min read · 6 parts · 6 mistakes to avoid
A linear function is a straight line, so every question about one is really a question about a point on that line. Graph the line, pin down the coordinate you were given, and read off the coordinate you were asked for.
12 min read · 6 parts · 6 mistakes to avoid
19 lessons, about 232 minutes of reading in total. Start with the free ones →
Not a selection of tricks — the College Board's own list, every skill with about 65 problems graded easy to hard. Start with the first 2, free forever.
1,235 problems in total. Start with the free guide to using Desmos on the SAT, or unlock all 19 →
Start free. No credit card required, ever, for the free tier.
Cancel any time — stops the next charge. No refunds.
Five months of monthly, and then it's yours
It is built into the test. The digital SAT runs in College Board’s Bluebook app, and a Desmos graphing calculator is available on every question in the Math section — no need to bring anything. That is exactly why knowing it well is worth so much: the tool is already there, and most students barely touch it.
No. The first two skills are free and start from typing your first expression. Every problem tells you what to type, what to click, and what to read off the screen.
They teach you the math. This teaches you the calculator as a test-taking strategy — which questions to graph instead of solve, what to type, and which point to click. And you practice inside a real Desmos calculator rather than reading about one.
Then the gain is time rather than technique. Graphing a question you could already do by hand takes seconds instead of a minute, and that time goes to the questions where you actually need it.
The first two skills, complete — every problem, the live calculator, the step feedback and the expert replays. No credit card, and no trial that quietly expires.
Monthly cancels any time from your account page and keeps working to the end of the period you have paid for. Lifetime is a single payment with nothing to cancel. Cancelling stops the next charge — it is not a refund of one already made.
No. All purchases are final, on Monthly and Lifetime alike. That is exactly why skills 1–2 are free and complete, with no credit card — try the real thing first and only pay if it works for you.
Two complete skills, free forever — enough to find out whether this changes how you sit the Math section.
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