Step-by-step answers
for every math problem.
Instant walkthroughs for algebra, calculus, physics, biology, chemistry, computer science, and history - the concept, the reasoning, and the common mistakes, not just the final answer. Free to try. $9/month or $50/year for unlimited.
All curated walkthroughs are free. Plus a free chat budget that replenishes every 5 hours - try the tutor on your real homework with no signup. Upgrade for unlimited.
A real explanation, right now, with no signup. Pick an example or type your own. Our curated problems are always free. New problems share a token budget that refills every 5 hours.
Click an example above, or type your own and hit Explain it. The walkthrough will appear here.
What this is not.
It's not Photomath. Photomath shows the answer. FinalsPrep shows the reasoning - which is what you actually need if you have to do the problem yourself on an exam next week.
It's not a general chatbot. General assistants hallucinate on harder problems, especially physics with unit conversions. FinalsPrep is tuned specifically for math and physics pedagogy, and refuses out-of-scope questions instead of making something up.
It's not one subject. One subscription covers every AP in the catalog: all four math APs, all four physics APs, biology, chemistry, environmental science, both computer science courses, and three history APs. Whatever you're taking is already in here.
It's not expensive. $9/month is less than one hour with a human tutor, less than a Barron's prep book, and less than two Chipotle orders. The yearly plan works out to $4.17/month - cheaper than one Starbucks drink.
Mistakes we watch for.
Every explanation includes a "common mistakes" callout when one of these shows up. These are the four most frequent ones across the curriculum.
Squaring both sides of √(2x + 3) = x and forgetting to check for extraneous solutions at the end. Squaring creates fake answers roughly half the time on these.
Writing log(x) + log(x − 3) = 1, solving for x = 5 and x = −2, then reporting both. x = −2 makes log(x) undefined - the answer is x = 5 only.
Plugging in numeric values before differentiating. If x = 6 goes in first, then dx/dt disappears because you just differentiated a constant. Always differentiate first.
Not tilting the axes. Keep x horizontal on an incline problem and you'll spend the next 15 minutes doing trig the hard way. Tilt the axes parallel to the ramp and the algebra collapses.
Three steps. Nothing clever.
1. Go to /study. Pick a topic from the sidebar, or jump straight to the solver. Paste a problem. It can be typed, or copy-pasted from a PDF, or retyped from a photo - whatever's fastest.
2. The tutor writes back a walkthrough in plain English. It names the concept in the first sentence ("This is conservation of momentum"), explains each step before doing it, and ends with a one-line takeaway.
3. Ask follow-up questions. The tutor remembers the conversation, so you can drill into the step you didn't understand without starting over.
16 AP courses. One price.
Whatever you're taking, it's in here. Math, science, computer science, history - every lesson structured around the official College Board unit numbering so you always know where you are.
- AP Precalculus
- AP Calculus AB
- AP Calculus BC
- AP Statistics
- AP Physics 1
- AP Physics 2
- AP Physics C: Mechanics
- AP Physics C: Electricity & Magnetism
- AP Biology
- AP Chemistry
- AP Environmental Science
- AP Computer Science A
- AP Computer Science Principles
- AP United States History
- AP World History: Modern
- AP European History
Free to try. Cancel anytime. Every AP, one subscription.
Two plans. Cancel anytime.
The free tier gives you 3-5 chat messages every 5 hours - enough to try the tutor on your actual homework. For unlimited access, pick a plan:
Cancel anytime. Good for finals week or a single AP exam.
- Unlimited AI walkthroughs on any problem
- All 16 AP courses, lessons, flashcards
- Chat history saved across sessions
- LaTeX rendering + voice input
Works out to $4.17/month. $58 cheaper than monthly over a year.
- Everything in Monthly
- Covers the entire school year
- Lock in the price - no renewals at a higher rate
- Cancel anytime, prorated refund
Stripe handles checkout. Cancel from your receipt email in one click. Free plan stays free - no credit card required to try.
Not ready to buy? Grab the formulas sheet.
One-page PDF. The 40-ish formulas from algebra through calc every student should know cold before an exam. No spam after - at most one follow-up email two weeks before finals week.
Does it work on my phone?+
Yes. The solver works fine on mobile. The diagrams can be a little cramped on small screens - we're working on it.
Can I use my school Google account?+
Yes. Checkout is standard Stripe, so any email works. School email sometimes routes receipts to spam.
Is this cheating?+
If you paste a problem in, read the explanation, and then do the problem again on your own, no. If you paste it in and copy the answer without reading, that's on you.
What if the tutor gets something wrong?+
Tell it in the next message and it will correct itself. If you hit a problem in scope where the explanation was genuinely bad, email support@finalsprep.com and we'll refund the purchase.
What if I want a refund?+
Reply to your receipt within 7 days. No questions asked.
How does this compare to a human tutor?+
$9/month is less than one hour with a human tutor, and a real tutor isn't available at 11pm the night before your exam. Use a real tutor for big conceptual gaps; use this for getting unstuck on homework.
Your next exam is closer than you think.
It takes less time to paste a problem in than to read the rest of this page. Try the free tier first. If it helps, $9/month is one click away.