Theory that answers the problem in front of you. The last release put the Theory one tap from a wrong answer. This one makes sure what you find there is the right rule, properly explained. We checked all 156 subtopics against the problems they actually generate and filled the gaps: the difference of cubes behind a 0/0 limit, working back to the price before tax, reference angles and quadrant signs on the unit circle, convergence tests beyond the geometric series. That is 39 new cards. Another 62 had an explanation that only restated, in smaller type, the formula printed above it. Each of those now says what the formula cannot, such as why a rare cause makes even an accurate test mostly false positives. Also fixed: a correct answer written a different way could be marked wrong. Swapping the order of the two terms in a product rule answer, or leaving out a multiplication dot, was enough to be rejected, and the product rule and integration by parts were the worst affected. An answer that was already fully expanded could also be told to expand further. And 16 integral problem types that had been written but never reached practice are now in rotation, and math is rendered entirely on device, so problems appear instantly and offline.

The explanations were always in the app. Now they are easy to find. Open the Theory for a subtopic straight from the topic list, without starting a session. Get one wrong, or skip it, and Show the rule is right there in the feedback. Also fixed: on some devices a question could appear blank instead of showing the problem.

Dark mode is here, and it looks stunning. Math Zen now follows your system setting, or pin it to Light or Dark under Appearance. Midnight practice, easy on the eyes. Also in this update: No more grinding to unlock. Make solid progress in a lesson and the next one opens. Momentum beats perfectionism. Statistics now starts free: descriptive statistics, variance and reading data are open to everyone. 16 brand-new problem types across probability, logarithms, vectors and statistics. An A-Level Maths path covering Pure and Statistics. Exam prep now leads with the exams your region actually takes, so what matters is always on top. Your daily goal shows today's count at a glance. Change your target any time in Settings. Your rank only climbs now. A rough session can't cost you a level anymore. Sharing a result now names the topic you mastered. Plus fixes to several factoring, limit and fraction problems, all reported by you. Keep them coming.

This release is all fixes, and they came from your in-app reports. Your correct answer is now accepted in more forms: factored answers, trig written without parentheses, and an answer you have wrapped in parentheses. Multiple-choice questions no longer offer the same answer twice, and the math reads cleaner: no stray "1x", no double negatives, fractions in lowest terms. Fixed long questions and solutions being cut off on screen. Keep the reports coming. They are what drives releases like this one.

New: choose the exam you're preparing for and it pins to your home screen — SAT, AP Calculus, Gaokao, ENEM, Suneung and more. And every exam's first lesson is now free, so you can try real exam problems before deciding on Premium. Freshly redesigned launch screen, too. Just practicing for yourself? Skip the exam question and nothing changes.

Thanks for the problem reports! This update fixes several multiple-choice questions where an answer option could appear duplicated or show up garbled, and corrects a percentage problem and a couple of hints.

New: Traditional Chinese (繁體中文) is here, interface and problems fully localized. New: GSAT (學測) exam-prep path, 35 authentic practice sets across polynomials, probability and statistics, trigonometry, vectors, and matrices. Plus polish and fixes.

1.14.0 - New: set a daily goal during setup and track it with a streak ring on your home screen. - Refinements to keep your daily practice on track.

1.13.3: - Fixed a rare issue that could interrupt sign-in. - Stability and privacy improvements under the hood.

1.13.2: - Fixed rounding problems so the rounding target (integer, tenth, hundredth) now displays correctly and in your language. - Cleaned up the step-by-step solutions for trigonometric and chain-rule derivative problems.

1.13.1: - Now available in Brazilian Portuguese. - New ENEM exam-prep path with authentic, exam-style problems: real-world word problems plus data interpretation with tables and charts. - You can now turn off vibration (haptic feedback) in Profile settings.

1.12.1: - Fixed cases where a correct answer could be marked wrong. The answer checker now accepts more equivalent forms, like writing ln x without parentheses. - Fraction problems now show full step-by-step solutions, from mixed numbers and common denominators to the final reduced answer. - Cleaned up a few geometry problems that could appear with confusing setups.

1.12.0: - Now available in Spanish. - Two new exam-prep paths: Selectividad (Spain) and EXANI-II (Mexico). - Reminders refined: turn the morning and evening reminder on or off separately, and set each time with a picker.

1.11.0: - New problem sets in the topics you practice most: fraction and percent word problems (discounts, growth, original price), comparing fractions, expanding brackets, logarithm shortcuts, and new function evaluation drills. - More variety in popular topics: heavy practice repeats much less. - Smarter answer checking: equivalent forms are now accepted in parametric and polar problems too. - Hints and answer choices fully localized in every language, with cleaner multiple-choice options. - Fixed rare problems that showed letters instead of numbers.

1.10.0: - New: Search. Tap the magnifier in the top bar to jump straight to any topic, subtopic, or exam path instead of digging through menus. - Cleaner home screen, with more room for your topics and progress.

1.9.5: - Fixed money word problems (discounts, interest, expected value) that showed raw formatting instead of clean text. - Probability answer choices now show tidy, fully reduced fractions. - Fixed a polynomial question that could have more than one correct answer, plus assorted formatting fixes.

1.9.4: - Fixed difference-of-squares factoring questions that showed the wrong expression. - Trig identities: added θ, csc, and cot keys so answers like sin(θ) are now typeable. - More accuracy and formatting fixes, including implicit differentiation and limits.

1.9.3: - Math Zen is now available in French. - New exam prep path: French Baccalauréat (spécialité maths): analysis, space geometry, and probability.

1.9.2: navigation fixes. - Tapping a Premium subtopic no longer leaves you stuck on "Loading problems...". You now go straight to the upgrade page. - Several free subtopics in Algebra, Derivatives, Geometry, and Probability that appeared blocked behind a Premium one are now reachable. You can finish those topics end to end without subscribing.

1.9.1: small but important fixes: - Fixed an incorrect perpendicular-slope answer in some Linear Equations problems. - The answer checker now accepts equivalent expressions even when LaTeX brackets differ (e.g. exponents written with or without braces). - Derivative answers display in their simplest form (no more unreduced 2/2 left in coefficients). - Cleaner formatting on inverse-function solutions, plus a small fix to a Chinese question template.

- New: report a problem. Tap the flag on the practice screen to flag a question that looks wrong or unclear, in a couple of taps. - Said your answer was right? The app re-checks it on the spot and tells you if it was actually equivalent. - Reports are saved even offline and send themselves once you're back online.

- Your first problem is now easier, with a quick tip to help you get going. - We'll send a friendly nudge if you haven't tried a problem yet. - Fixed the "all caught up" celebration when you resolve the last mistake in your journal. - Smaller paywall in the first session, so you can breathe.

- Resolve the last mistake in your journal and you'll see a small "all caught up" moment. - Polish on the home mistake card and journal list previews. - Small fixes across navigation and the renderer.

- New: Mistake Journal. Every wrong answer is saved so you can come back later and retry that exact problem type until it clicks. - Daily goal ring on the home screen tracks today's practice at a glance. - Timed mode now remembers your last duration. Long-press the button to switch. - Theory now covers cot, csc, and the quotient rule. - Smarter Continue card: skips topics you've already finished. - Polish across the home screen, stats empty state, and session-end summary. - Bug fixes: derivative answer normalization, Google sign-in deep link, toast clearance under Dynamic Island.

- Practice progress now syncs across your devices - Sign in with Google: faster and more reliable - Fixed: practice progress now decays at the intended pace, not faster - Stats theory now shows both population and sample variance formulas - Polish and bug fixes