Practice that follows your weak spots
Practice is weighted toward the skills you keep missing, and steps up in difficulty as your accuracy holds. Your measured results replace your self-rating as evidence arrives.
Thousands of verified questions. One goal: 1600.
SAT practice you can check.
Most prep apps ask you to trust that a machine wrote a good question. Beaver makes every question prove it first.
Now on iPhone and iPad.
Android coming soon.
Free plan, no card. Premium is $39.99 at launch, and sponsored free for students who apply.
Item 04412 · AlgebraMedium
If 3(x − 2) = 5x + 4, what is the value of x?
A −1
B −3
C −5
D 5
claude-haikuC
deepseek-r1C
nova-proC
Verified3 of 3 agreed, blind
How a question earns its place
One model writes the item. Three models from different families then answer it with the key and explanation hidden from them. Disagreement sends the question to a human reviewer instead of to you.
- generator
Written, then challenged
A generator writes the question, four choices, the answer, and why each wrong choice is tempting. Nothing ships on the strength of that alone.
- blind solve × 3
Solved blind, three times
Three model families see only the question and the choices. Using different families matters: their mistakes don't line up, so agreement means something.
- the gate
Unanimous, or it waits
There is no partial credit at this step — the item either clears or it doesn't.
3 of 3 agree → into your practicesplit → tutor review queue
What you get
A study plan that reacts to your work, full-length timed sections, and a tutor that explains rather than just marks.
Full-length timed sections
Reading & Writing and Math modules at real exam length and pacing, drawn from the verified bank — then reviewed question by question.
A tutor that shows the work
Ask why an answer is right, or why the one you picked was tempting. Explanations render real math, not plain-text approximations.
Pricing
Start free. Go Premium at the launch price. And if cost is what stands between you and the test, apply — we'll cover it.
Free
$0 / month
Everything you need to start studying today.
- 20 practice questions a day
- One full-length exam a month
- Adaptive drills on your weak areas
- 300-word vocabulary trainer
- AI tutor, 20 messages a day
Launch price
Premium
$50$39.99 / month
$39.99 while we're in launch. Your price stays there for as long as you keep the plan.
- Unlimited practice questions
- Unlimited full-length exams
- Unlimited AI tutor conversations
- Full performance history and score projection
- Priority access to new question sets
By application
Student access
Free / sponsored
Full Premium, paid for by us, for students who can't.
- Everything in Premium
- No card, no trial clock
- Renewed each term while you're studying
Create an account, then apply from your profile page. We ask what you're preparing for and how to reach your school — not for financial documents.
Available on the App Store
Study anywhere. On your phone.
The whole product travels with you — the tutor, adaptive drills, full-length timed exams, vocabulary, and your progress. Your work syncs with the web, so you can start a drill on the bus and review it on a laptop.
- An AI tutor that renders real math, not plain-text approximations
- Timed exams in a distraction-free full-screen test mode
- Drills that follow your weak spots and step up as you improve
- Free to download, free to study — no card required
Requires iOS 17 or later.
About us
Beaver1600 is an SAT preparation platform sponsored by Ras Heuristics.
Good SAT preparation is expensive, and the students who need it most are the least likely to get it. Beaver1600 exists so that the quality of your prep depends on your effort, not your budget — that's why sponsored seats sit next to the paid plan, not behind it.
The bar stays where the name puts it: every practice question must survive blind verification before a student ever sees it, and SAT tutors review the bank on top of that. If a question can't prove itself, it doesn't ship.
— the Beaver1600 team
Practice on questions that earned it.
Create an account and start with a diagnostic. It takes about a minute to set your target score and test date.