Steps, and why each one works
Photograph the problem or type it. You get the worked solution, the reasoning behind every step, and practice problems built from the same idea — so you can do the next one without us.
A smarter way to learnStop relearning
Stop relearning
the same thing.
Snap any problem and get the steps and the reasoning behind them. Then it remembers what you got wrong, and brings that back before the exam — instead of after it.
Your first solve needs no account — no email, no card. Then 5 a day free, forever.
This is what you getExample
find dy/dx for y = sin(3x²)
Answer
dy/dx = 6x·cos(3x²)
Step 1 — Spot the composition
y = sin(u) with u = 3x² — an outer function wrapped around an inner one, so the chain rule applies.
Step 2 — Differentiate the outer function
d/du [sin(u)] = cos(u), so we get cos(3x²), keeping the inside untouched.
Step 3 — Multiply by the inner derivative
du/dx = 6x, so dy/dx = cos(3x²) · 6x = 6x·cos(3x²).
Why this works
The chain rule composes rates of change: how fast sin changes with respect to u, times how fast u changes with respect to x.
Every solve comes with the steps, the why, and practice problems — and it stays in your review queue on this device, so it's still there at the exam.
What you get
Four things that work as one
Most students pay for a solver, a flashcard app and a language app that never speak to each other. Here a problem you got wrong in September is still being brought back to you in November.
It brings back what you're forgetting
Every concept you touch goes into a ledger with how well it held. The review queue surfaces what's fading before your exam, and skips what you already know cold.
Quizzes that make you produce the answer
Nine kinds of question — fill the blank, match the pairs, build the sentence, order the steps — generated from your own material. Not multiple choice on repeat.
Hold a conversation, at your level
Sofia writes back in the language you're learning and reads it aloud, from glossed short sentences up to native pace. You type — there's no microphone. Drilling your own saved words is free and unlimited.
Solve something freeNo account for your first one.
The difference
Everything else forgets you
A solver answers the question and moves on. A chatbot starts a new conversation. A flashcard app only knows what you typed into it. None of them notice that you have now missed the same idea three times.
What normally happens
You get the answer. You feel like you understand it. Three weeks later the exam asks the same thing in a different shape and it is gone, and you do not even remember which part you never had.
What happens here
Every idea you touch is scored against the class it came from. Miss it and it comes straight back. Get it right and it waits longer. Open Practice and it tells you the part you keep fumbling, by name — not just how many cards are due.
Watch one concept over three daysIllustration
TodayLogged
calculus:chain rule
100% retainedreview triggers below 70%
The chain rule from the example above gets filed against the class it came from. This is where a solver app, a chatbot and a photo app all stop.
Compared to what you use now
One app instead of three, and it keeps score
| Capability | A solver app | A flashcard app | Free AI chat | SolveItAi |
|---|---|---|---|---|
| Steps and reasoning for your own homework | Yes | No | Yes | Yes |
| Free to try without an account | Limited | Yes | Yes | Yes |
| Remembers which ideas you keep missing | No | Only what you typed in | No | Yes |
| Brings it back on its own before the exam | No | If you build the deck | No | Yes |
| Study cards quoted from your own lecture | No | No | No | Yes |
| Catches your professor saying “this is on the exam” | No | No | No | Yes |
The last three rows are the whole point. The first two are why the free tier is worth using even if you never pay us anything.
How it works
Three steps, and none of them is homework
- 01
Bring the thing you're stuck on
Snap a photo of the problem or paste your notes — that part is free. On Plus and Pro you can turn a lecture into notes too, by dropping the recording in on a laptop or pasting the transcript. No setup, no picking a topic from a menu.
- 02
Understand it, don't just collect it
Read the steps and the reasoning. Ask about the one step that lost you. Turn it into practice while it's still fresh.
- 03
Keep it until the exam
It goes into your review queue and comes back on the schedule that keeps it — not the night before, when it's already too late.
What it costs
Cheaper than the apps it replaces
Most students end up paying three subscriptions to do these jobs separately — about $25.97 a month between them, and none of the three knows what the others taught you.
Enough to actually use, not a teaser.
- 5 solves a day
- 1 quiz a day
- 15 minutes a day with the tutor
- Review and practice, unlimited
For one course that keeps ambushing you.
- Four times the solves and the tutor
- Turn lectures into notes and recall cards
- Quizzes from your own material
For a full STEM load, where being wrong costs you.
- Unlimited quizzes
- Our deepest reasoning on every full-quality solve
- Twice the lectures, twice the tutor
See everything in each planCancel any time, from inside the app.
No ads. No answer-only mode. No made-up numbers.
Every step explainedThere is no button that hands over an answer with the reasoning stripped out.
Your work stays on your deviceSolves, notes and your review queue live in your browser, not on our servers.
Claims are testedEvery number on the pricing page is checked against what the code enforces — a mismatch fails the build.
Ready to study differently?
Put your actual homework in and see what comes back. If it isn't better than what you're doing now, you've lost about ninety seconds.
Free forever: 5 solves, one quiz and 15 minutes with the language tutor, every day.