Math you can actually trust.
Nabla is deliberate practice for university math — the courses engineering and
STEM students have to pass. Learn the idea, see a worked example, then drill it
until it sticks.
VERIFIED, NOT GUESSED
Every problem and every answer in Nabla is generated and independently checked by
a computer algebra system before it ever reaches you. No scraped question banks,
no AI-written answers that sound right and are not. When Nabla shows you a
solution, the math behind it has been proven.
SEVEN COURSES
• Math Foundations — order of operations, fractions, exponents, polynomials,
factoring, inequalities, graphs, functions
• Calculus I — limits, continuity, derivatives, product and quotient and chain
rules, related rates, optimization, integrals, the Fundamental Theorem
• Calculus II — integration by parts, partial fractions, improper integrals,
sequences and series, Taylor series, parametric and polar curves
• Linear Algebra — vectors, matrix products, row reduction, determinants,
inverses, linear independence, rank, projections, eigenvalues
• Multivariable Calculus — vectors in 3D, partial derivatives, gradients,
directional derivatives, tangent planes, double and triple integrals
• Differential Equations — separable, linear and exact equations, stability,
characteristic roots, oscillations, Laplace transforms, ODE systems
• Probability & Statistics — counting, conditional probability, Bayes' rule,
distributions, confidence intervals, hypothesis tests, regression
1,500+ verified problems across 91 skills.
HOW IT WORKS
Each skill opens with a concept lesson and a worked example, then a focused set of
practice problems. Get one wrong and you see exactly where the reasoning broke —
Nabla names the specific misconception behind the answer you picked, not just a
red X. Del, your math spotter, hands you a strategy hint before the full steps.
Streaks, XP, levels, daily goals, and weekly leagues keep you coming back. Spaced
review brings problems back before you forget them.
EXAM MODE
Timed, mixed, no hints, no feedback until you hand it in — the same pressure as
the real paper. Then a topic-by-topic breakdown showing exactly where the marks
went, with the weakest skill first and a route straight into it.
WORKS OFFLINE
The full problem bank ships inside the app. No account, no sign-up, no internet
required to practise. Your progress stays on your device.
FREE AND PRO
The opening unit of every course is free — a real place to start in all seven,
not a demo. Nabla Pro unlocks every remaining unit, removes the hearts limit,
opens Del's full hint ladder, and enables Exam Mode.
No ads. No account. No data sold.
———
Nabla Pro — auto-renewing subscription
• Monthly
• Yearly (best value)
Prices are shown in your local currency inside the app before you purchase.
Payment is charged to your Apple ID account at confirmation of purchase. The
subscription renews automatically unless it is cancelled at least 24 hours before
the end of the current period. Your account is charged for renewal within 24 hours
prior to the end of the current period. You can manage or cancel your subscription
in your Account Settings on the App Store after purchase.
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Privacy Policy: https://hamzacakmakk.github.io/nabla-site/privacy.html
Support: https://hamzacakmakk.github.io/nabla-site/support.html
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