Understand the working,
not just the answer.

Scan any question and Nuclei walks through it step by step. The reasoning comes first, the final answer last, so you actually learn it for the exam.

Encrypted in transit Step-by-step by default Answers in seconds

Three steps, every time

No matter the subject, Nuclei follows the same order, so the process stays predictable while you revise.

01

Scan the question

Photograph it, paste it, or type it in. Nuclei reads it and identifies what is actually being asked.

02

Follow the reasoning

Each step is explained in plain language before moving to the next, so you can check your own logic against it.

03

See the final answer

The answer arrives last, once the working makes sense. Built for revision, not for submitting someone else's work.

How tokens work

Nuclei runs on tokens. Each time you solve a question, a small number of tokens is spent based on how detailed you want the walkthrough to be. That is it. No subscription, no monthly fee, no surprise charges.

Spend only when you solve

Tokens sit in your account until you use them. Nothing expires, nothing auto-renews. If you don't solve anything, you don't spend anything.

no expiry

Pay for detail, not access

The same question can be solved cheaply or in full depth. Choose the level that matches what you actually need before hitting solve.

from 1 token

Top up whenever

Buy a pack once and it lands in your balance instantly. Payments are handled entirely by Stripe, so we never see your card details.

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Long explanation
Full step-by-step walkthrough with reasoning for every move.
3 tokens
Short and sweet
Concise steps that still show the method, without the long-form detail.
1.5 tokens
Answer only
Just the final result, no working. Good for checking your own work.
1 token
Flagged requests
If the model refuses a request for safety reasons, you are charged a small fraction as an abuse deterrent.
0.5x the tier
Buy tokens Prices vary by pack size. Top up anytime from your dashboard.

Built for exam-season subjects

Nuclei detects the subject automatically, or you can set it manually from the solver settings.

Mathematics Physics Chemistry Biology Economics Computer Science Statistics English Language