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. $16/month or $90/6 months for unlimited.
All curated walkthroughs are free. Plus 10,000 AI tokens per day on the Learner tier — enough to run the tutor on your real homework with no signup.
A real explanation, right now, with no signup. Pick an example or type your own. Our curated problems are always free. New problems pull from a daily token budget — 10,000 tokens a day on the Learner tier.
Sign in to use the AI tutor.
Free to create. Email verification keeps the tutor free and fair for everyone. Takes 30 seconds.
No credit card. No spam. Cancel any time.
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 less than a single tutoring session. $16/month is less than one hour with a human tutor and much less than a Barron's prep book. The 6-month plan works out to $15/month and covers an entire semester of finals.
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.
Three plans. Cancel anytime.
Learner is free forever — 10,000 AI tokens a day, every day. Pro doubles that with image uploads, FRQs, diagnostic quizzes, and a smarter thinking mode. Hacker quadruples it again with priority traffic and the strongest reasoning model on demand.
Test the tutor on your real homework. No card required.
- 10,000 AI tokens / day
- Units 1-2 of every AP course + 2 free lessons
- Graphing calc, physics sims, code sandbox
- 1 diagnostic quiz per month
$16 with SCORE5, then $16/mo. Or $90 for 6 months.
- Everything in Learner
- 20,000 AI tokens / day
- Smarter model + Thinking mode for hard problems
- All 16 AP courses, every unit + unlimited lessons
- Image uploads, FRQ practice, Insights
- 5 diagnostic quizzes per month
$29 with SCORE5, then $29/mo. Or $160 for 6 months.
- Everything in Pro
- 80,000 AI tokens / day
- Priority AI traffic — no queueing
- Strongest model on demand, always
- Unlimited diagnostic quizzes
| Feature | Learner | Pro | Hacker |
|---|---|---|---|
| AI tokens per day | 10,000 | 20,000 | 80,000 |
| Model strength | Standard | Smarter + Thinking | Strongest + Thinking |
| AI chat tutor | ✓ | ✓ | ✓ |
| All 16 AP curriculum walkthroughs | Units 1-2 | All units | All units |
| Full lessons | 2 free | Unlimited | Unlimited |
| Practice problems | ✓ | ✓ | ✓ |
| Graphing calc, physics sim, code sandbox | ✓ | ✓ | ✓ |
| Flashcards + diagrams | ✓ | ✓ | ✓ |
| Chat history saved across sessions | ✓ | ✓ | ✓ |
| Image uploads (photos of handwritten work) | × | ✓ | ✓ |
| FRQ practice + quiz notes | × | ✓ | ✓ |
| Diagnostic quizzes per month | 1 | 5 | Unlimited |
| Insights (usage dashboard) | × | ✓ | ✓ |
| Wrong-answer review bank | × | ✓ | ✓ |
| Priority AI traffic | × | × | ✓ |
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 finalsprephelp@gmail.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?+
$16/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, $16/month is one click away.