Marks your child's maths working like an examiner, then teaches the fix.
For GCSE maths: your child writes their working, RedPen shows exactly which line lost the mark and explains the step out loud, the way a good teacher would.
Try it: write your working and pause
Pick a question, write your steps with a finger or mouse, and stop for a moment. Nothing you write is saved.
Find x: 3(x − 2) = 2x + 5
Your child gets this on every GCSE maths topic. Get the early-bird pass
How it works
- Practise a real GCSE-style questionQuestions will cover the full GCSE maths specification, Foundation and Higher.
- See exactly which line lost the markThe red pen marks the first step that went wrong, not just the final line.
- Fix it with a spoken re-teachIt explains that step out loud with diagrams, then will give a similar question to try.
A weekly report for you
See where marks are being lost, by topic, without having to check the work yourself.
Preview: the report is being built now.
| Topic | Marks lost this week | Trend |
|---|---|---|
| Algebra: expanding brackets | 6 | improving |
| Fractions | 4 | steady |
| Pythagoras | 1 | improving |
Built properly
- Covers the full GCSE maths specification for AQA, Edexcel and OCR.
- Built with a GCSE maths examiner. We will publish how often RedPen agrees with the examiner before launch.
- Your child’s work is never sold or used for advertising.
Early-bird Season Pass 2027
£49 £79
January to June 2027: the run-up to the summer GCSE exams. Limited to the first 200 families.
Full refund any time before launch, and a 14-day money-back guarantee after.
Early-bird passes open soon. Join the waitlist to be first in line.
Join the waitlistQuestions parents ask
Is this cheating?
No. RedPen only works on practice questions, marks the working your child has already written, and points to the step that went wrong rather than handing over the result. It is built for learning, not for coursework or homework hand-ins.
Which exam boards and tiers?
GCSE maths for AQA, Edexcel and OCR, at Foundation and Higher tier. The topics are shared across boards, and questions will be tagged by tier.
When does it open?
January 2027. Early-bird families get access first and a short email each month on how the build is going.
Can I get a refund?
Yes. Email us any time before launch for a full refund. After launch there is a 14-day money-back guarantee.
What happens to my child's data?
On this page, nothing a student writes is stored. When the product opens, work is kept only to produce your reports, never sold, and you can delete it at any time.
Not ready yet? Join the waitlist
One short email a month on how the build is going, plus launch news. Unsubscribe any time.