11+ and GCSE prep from £19.99 a month.
Adaptive practice and full mock exams on every paid plan. The free plan takes no card.
Cancel anytime. No hidden fees.
Choose a plan
Free
One child, 20 questions a day, and no card.
Free forever, no card required
- 1 child profile
- 20 questions per day
- All subjects for your stage, 11+ or GCSE
- 1 free diagnostic test
- Times table drill
- Vocabulary practice
- Basic progress tracking
- No card required
Core
Unlimited practice for one child preparing for the 11+ or GCSE.
Billed monthly. Switch to yearly and save 25%.
5-day free trial, then £19.99/mo
Cancel anytime before trial ends to avoid charges.
- Everything in Free, plus:
- Unlimited questions
- Full mock exams
- Unlimited diagnostics
- AI Socratic tutor
- AI writing & coding marking
- Spaced repetition
Family
One plan for up to three children, with 11+ and GCSE access in one parent account.
Billed monthly. Switch to yearly and save 25%.
5-day free trial, then £29.99/mo
Cancel anytime before trial ends to avoid charges.
- Everything in Core, for the whole family:
- Up to 3 child profiles
- Separate progress and learning paths
- Manage multiple learners in one place
- Priority email support
Cancel at any time. Paid trials require card details. Nothing is charged during the trial.
What it costs elsewhere
How the price compares
Typical tutor or platform
£40-300
per month
Unlimited questions
£19.99
per month
Keystral Family
£29.99
up to 3 children
Every plan includes adaptive practice and the parent dashboard. Mock exams and spaced repetition start on Core.
Safe and secure
GDPR compliant, UK-hosted data
5-day free trial
On Core and Family
Curriculum mapped
To the England national curriculum
Cancel anytime
No minimum term
How it works
Practice that adapts to your child
Most platforms give every child the same questions in the same order. Keystral works out what your child has and hasn't grasped, and targets the gap.
Finds the gaps
A short diagnostic establishes a baseline per topic, then every answer updates it. Questions are chosen against that estimate, so practice lands where it is needed.
Brings topics back
Topics return on a spaced schedule, timed to the point where a reminder does the most good, so what was learned in October is still there in January.
Marks the long answers
Extended writing is marked against exam criteria, GL for the 11+ and AQA AO5/AO6 for GCSE, with the score and the reasoning saved for you to read.
Detailed comparison
What each plan includes
Free, Core and Family, side by side.
| Feature | Free | Core | Family |
|---|---|---|---|
| Child profiles | 1 | 1 | Up to 3 |
| Daily questions | 20 | Unlimited | Unlimited |
| All 11+ & GCSE subjects | Included | Included | Included |
| Diagnostic tests | 1 | Unlimited | Unlimited |
| Mock exams | Not included | Included | Included |
| Spaced repetition | Not included | Included | Included |
| Personalised study plans | Included | Included | Included |
| Times table drill | Included | Included | Included |
| Vocabulary practice | Included | Included | Included |
| Separate progress per child | Not included | Not included | Included |
| Notes & bookmarks | Included | Included | Included |
| Weekly progress reports | Included | Included | Included |
| AI Socratic tutor | Not included | Included | Included |
| AI writing & coding marking | Not included | Included | Included |
| Support | Priority email |
Free
- Included:Child profiles(1)
- Included:Daily questions(20)
- Included:All 11+ & GCSE subjects
- Included:Diagnostic tests(1)
- Not included:Mock exams
- Not included:Spaced repetition
- Included:Personalised study plans
- Included:Times table drill
- Included:Vocabulary practice
- Not included:Separate progress per child
- Included:Notes & bookmarks
- Included:Weekly progress reports
- Not included:AI Socratic tutor
- Not included:AI writing & coding marking
- Included:Support(Email)
Core
- Included:Child profiles(1)
- Included:Daily questions(Unlimited)
- Included:All 11+ & GCSE subjects
- Included:Diagnostic tests(Unlimited)
- Included:Mock exams
- Included:Spaced repetition
- Included:Personalised study plans
- Included:Times table drill
- Included:Vocabulary practice
- Not included:Separate progress per child
- Included:Notes & bookmarks
- Included:Weekly progress reports
- Included:AI Socratic tutor
- Included:AI writing & coding marking
- Included:Support(Email)
Family
- Included:Child profiles(Up to 3)
- Included:Daily questions(Unlimited)
- Included:All 11+ & GCSE subjects
- Included:Diagnostic tests(Unlimited)
- Included:Mock exams
- Included:Spaced repetition
- Included:Personalised study plans
- Included:Times table drill
- Included:Vocabulary practice
- Included:Separate progress per child
- Included:Notes & bookmarks
- Included:Weekly progress reports
- Included:AI Socratic tutor
- Included:AI writing & coding marking
- Included:Support(Priority email)
Questions parents ask before paying
Yes. The Free plan costs nothing and does not ask for a card. It gives you 1 child profile, 20 questions a day, 1 diagnostic test and basic progress tracking, and it does not expire. The 5-day free trial is a separate thing: it applies to the paid Core and Family plans and does take card details at sign-up.
After your 5-day free trial ends, your subscription automatically begins at the plan rate you selected and your card is charged. You are not charged during the trial. If you cancel before the trial ends you are not charged at all, and you can carry on using the Free plan.
You can upgrade or downgrade at any time from your account settings. An upgrade is prorated for the rest of the billing period. A downgrade takes effect at your next billing date.
Cancel at any time from your account settings. You keep your paid features until the end of the current billing period, and the account then moves to the Free plan.
We use AES-256 encryption for data at rest and TLS 1.3 in transit. We are GDPR compliant, we do not share your personal data or your children's learning data with third parties, and all data is stored on servers in the UK.
Cancel whenever you like, and you keep your paid features until the end of the billing period you have already paid for. Nothing is taken after that. If something has gone wrong with a payment, email support@keystral.com and we will look into it.
Yes. The Free and Core plans each support 1 child profile, while the Family plan supports up to 3 children. Each child gets their own 11+ or GCSE path and their own progress, all under a single parent account.
Most platforms give every child the same questions in the same order. Keystral uses Bayesian Knowledge Tracing to estimate what each child knows topic by topic, and picks the next question against that estimate. Writing is marked against examiner rubrics (GL for the 11+, AQA AO5/AO6 for GCSE), and the parent dashboard shows mastery as it changes. On price, a private tutor is commonly £40 to £300 a month depending on how often they come, while Core is £19.99 and Family is £29.99 for up to 3 children across the 11+ and GCSE, each with a 5-day free trial.
Try it before you pay.
Stay on Free for as long as you like, with no card. Or take five days on a paid plan first.