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$0USD / month
  • Access 1000+ DSE math questionbank
  • Limited AI chat and feedback
  • Access to DSE Math study group
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$5USD / month
  • Unlimited AI questions (faster, better AI models)
  • 50+ DSE Predicted Papers, reviewed by our Math specialists
  • Priority access to our DSE Math study group, with unlimited Q&A with our tutors
  • Everything in Free
Built by people who know HKDSE Math inside out
Lag Chun
Math Consultant
Lam Sir
Veteran Math Teacher & Former HKEAA Examiner
So Tze Chung
Math Tutor
Linsy Lee
Curriculum Content Lead
30+ Years Teaching ExperienceFormer HKEAA ExaminerDSE 5** AchieverHKU SPACE Lecturer
Frequently asked questions
What counts as an "AI question"?
Each time the AI generates a geometry diagram or a practice question for you, it uses your daily allowance. Browsing sessions, viewing old chats, and viewing shared links are always unlimited. Free accounts are subject to dynamic daily rate limits to ensure server stability.
How does the referral program work?
Share your referral link from the sidebar. When 2 friends sign up and make at least one AI question, you earn 4 weeks of free Premium. You can earn this reward up to 5 times.
Can I cancel at any time?
Yes. You can cancel from the Stripe customer portal linked in your account. You keep Premium access until the end of the current billing period.
Is the content aligned to the HKDSE syllabus?
Yes. SketchMath is built and reviewed by real HKDSE tutors — including a former HKEAA examiner — and is optimized for the HKDSE Math curriculum (Core & M1/M2), turning exam-syllabus topics into interactive, visual lessons.