Fee schedule
A tutor charges £20–60 an hour. A season of marking costs £24.99.
Pay once. No subscription, no auto-renew.
A pass covers the whole product across every active supported Cambridge subject. The three differ only in how long they last, and nothing renews when they end.
| Difference | Free£0No card | Any passFrom £9.99one payment |
|---|---|---|
| Marked reps | 5 a day | Unlimited for normal use |
| Marked full papers | One, for the life of the account | Every paper you sit |
| Explainers | 10 a day | Unlimited for normal use |
| Predicted grade | Not included | Grade range per subject and per paper |
A pass attaches to the student's account, so it is bought from theirs. Paying for someone else? See how a parent pays.
For parents
Paying for someone else
A pass is one payment for a fixed run of days. There is no subscription to forget about and nothing to cancel. Receipts are emailed for every payment and the expiry date is on the student's Settings page.
The student can send you a payment link from inside the app: it opens one pass, takes one card payment through Stripe, and shows you nothing else from their account. A link stays live for 72 hours.
Anything else, email hello@papergrinder.com.
Questions
Do I need a credit card to start?
No. Free includes 5 marked reps and 10 explainers every day, plus one fully marked past paper. There is no trial period and no card is required.
Does a pass renew?
No. A pass is one payment for a fixed number of days. Nothing renews, nothing recurs, and there is nothing to cancel. When it runs out you drop back to Free with all your work intact.
What if I buy another pass while one is running?
The new one starts when the current one ends, so you never lose days you already paid for.
What does a pass cover?
All of it, across every active supported Cambridge subject: the catalogue, marking against the official scheme, full papers, loss diagnosis, replay and the Record. Passes differ only in how long they last.
Which exam boards are supported?
Cambridge (CAIE), covering 24 IGCSE subjects. The catalogue has 71,348 questions from real past papers from 2015–2025.