# Simple pricing, by the problem

Every problem costs 1 credit, whatever its topic or explanation level: $0.08 to $0.10 per problem depending on the plan or pack. Subscribe for the best price, or buy a one-time pack.

- Starter: $7.99 / month, 100 credits
- Pro: $19.99 / month, 250 credits
- Tutor: $49.99 / month, 650 credits
- Mini: $4.99, 50 credits
- Plus: $14.99, 160 credits
- Max: $34.99, 420 credits

## Billing FAQ

### What does a problem cost?

1 credit: one solved problem of up to 300 words, in any topic and at either explanation level. The price is shown before you solve, and it is the same for a one-line equation and a long word problem.

### Is there a free plan or free credits?

No. Creating an account is free, but there are no signup credits or free daily problems; solving uses purchased credits. The guides, formulas and worked examples on the site are free to read.

### Do unused credits expire?

Purchased and subscription credits stay on your balance while your account is open.

### Can I cancel my subscription?

Yes, at any time from your account page. The plan stays active until the end of the paid period.

### Do I get credits back if a solution fails?

Yes. If a solution fails, runs out of time or the text is not a math problem, the credit returns to your balance automatically.


_Last updated 2026-10-29_