# Start Math — Trace back to where you stuck > Trace back to where you stuck (iPhone/iPad app by CHUNGKIL KIM.) - Source: https://appshunter.io/ios/app/start-math/id6799822841 (this page in markdown: same URL + `.md`) - Developer: [CHUNGKIL KIM](https://appshunter.io/developer/960187999) - Category: Education - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 18.0 · 34 MB - Languages: Korean - Released: 2026-08-27 - Data updated: 2026-09-10 - User reviews in markdown: https://appshunter.io/ios/app/start-math/id6799822841/reviews.md ## What is Start Math? School mathematics as one path: concept, worked example, practice, review. No account. No internet required. ■ It traces back to where you actually got stuck If you keep missing quadratic equations because the real gap is in factoring, a hundred more will not help. This app collects the concepts behind your wrong answers, walks back the prerequisites and says where to restart. A lesson you reach that way opens even if locked, and never locks again — pointing at the gap and then closing the door would be pointless. ■ Wrong answers come back just as you are about to forget Every miss goes into your review notebook and returns after 1, 3, 7, 16 and 35 days. Get it right and the interval grows; miss it again and it restarts. You can tag why you missed it — an arithmetic slip, a concept you did not know, or a misread question. Slips do not count against concept mastery, and wait three days instead of one. Why you missed it matters more than how many you missed. ■ Formulas are typeset, and read aloud properly No formula images. Rule thickness, radical slant and exponent size follow typesetting rules, so nothing blurs when you enlarge the text. With VoiceOver they are read in natural Korean word order. Concept-card graphs have draggable coefficients: that the sign of a flips a parabola is faster to see once than to read twice. ■ When the exam is two weeks away Enter the scope and the minutes you can give each day. The plan follows prerequisite order and keeps the last two days for review. If time is short, it drops the hardest problems and says so. ■ Room to work it out by hand Every problem has a writing space beside it; on iPad the screen splits, problem on one side and your working on the other. Your working is saved per problem and returns in the wrong-answer notebook — where it went wrong matters more than what. Handwriting is not graded. ■ One card for a parent A week's work can be sent as one card — time studied, problems solved, lessons finished. No rank, no comparison, nothing sent automatically: the student taps to send and sees first what will go. ■ Also · Concept map — what you know, what you do not, and the path · Statistics — streak, progress, causes of mistakes, solving time · Answer statistics — how often a problem is missed. Off by default · Daily problem widget — free-section only, so a tap never hits a paywall · Review reminders — off by default; at most once a day · iCloud sync · iPad two-pane · Dark Mode · Dynamic Type ■ What is included Thirteen subjects of the Korean curriculum: middle school years 1 to 3, Common Math 1 and 2, Algebra, Calculus I, Probability & Statistics, Calculus II, Geometry, Math for AI, Math for Economics and Math for Work — 91 units, 461 lessons, 4,610 problems. Mock-exam sets for the March, June and September 2026 assessments: no original questions, but a walkthrough and an original look-alike problem per item (90). A fifth tier, Challenge: 212 exam-style problems spanning several lessons of a unit, four per unit in the seven high-school subjects. All 143 graphs and diagrams are drawn from coordinates, not images. Concept cards come in five kinds, including misconception cards. ■ How much is free The opening lessons of every unit are entirely free — concepts, examples, practice. One further lesson gives concepts and worked examples, with the paywall at its problems. See how the app teaches before you buy. ■ Purchases One pack per subject — buy only the years you need. One-time purchases, not subscriptions: nothing recurs, nothing expires. Family Sharing is supported; content updates are free to everyone who bought. ■ Privacy No sign-up, no login, no developer server, no ads. Anonymous usage statistics — no advertising identifier, nothing tied to you. Reporting a problem sends what you wrote and the answer you gave, shown before you tap. Answer statistics are off by default; turned on, your answer goes once per problem. The rest stays on your device. ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Middle School Math Year 3 | $4.99 | one-time | | Middle School Math Year 1 | $4.99 | one-time | | Middle School Math Year 2 | $4.99 | one-time | | Common Math 1 | $5.99 | one-time | | Common Math 2 | $5.99 | one-time | ## Version history (last 5 releases) ### 1.6.0 — 2026-09-08 Challenge problems for middle school, years 1 to 3. · Four per unit, 92 in all — one step deeper inside the curriculum: divisor counts, coprimes, skew lines, repeating decimals, circumcenter and incenter · They live in the supplement layer, so progress and the free section are untouched; owners see them as new problems Every unit now says where it is used. · Logarithms in decibels and earthquake magnitude, the dot product in search engine similarity, geometric sequences in loan repayment — three or four real uses for each of the 91 units · Each use can jump to the related lesson inside the app, across subjects · Visible on locked units too ### 1.5.0 — 2026-09-05 Mock-exam sets are here. · The March, June and September 2026 grade-2 national assessments — a solution walkthrough paired with an original look-alike problem for every item, 90 items across Common Math 1 and 2, Algebra and Calculus I · The original questions are not reproduced · Sets open with the subject pack, and the look-alike problems go into your wrong-answer notebook and reviews like any other A fifth difficulty tier, Challenge. · Above Top tier: exam-style problems that combine concepts from several lessons of a unit · Four per unit across the seven high-school subjects — 212 problems · They live in the supplement layer, so progress and the free section are untouched; owners see them as new problems ### 1.4.0 — 2026-09-03 Three more career-elective subjects are in, completing all thirteen subjects of the 2022 Korean curriculum. · Math for AI — big data, text and image data, trends and prediction, optimisation and classification 5 units · 25 lessons · 250 problems · Math for Economics — indices, exchange rates and tax, interest and annuities, supply and demand, matrices and inverses, marginal analysis 5 units · 25 lessons · 250 problems · Math for Work — units and estimation, ratios and percentages, patterns and equations, shapes and measurement, data and chance 5 units · 25 lessons · 250 problems · 55 new glossary entries: calculus, conic sections, solid geometry, vectors ### 1.3.0 — 2026-09-03 The first two career-elective subjects are in. · Calculus II — limits of sequences and series, differentiation and integration of exponential, logarithmic and trigonometric functions, applications of the definite integral 7 units · 35 lessons · 350 problems · Geometry — conic sections, solid geometry and space coordinates, vectors 7 units · 35 lessons · 350 problems · The subject picker is now grouped: middle school, common, general elective, career elective · Concept-card figures now draw exponential and logarithmic curves, parabolas, ellipses, hyperbolas and solids · Problems added by an update carry a "New" tag ### 1.2.1 — 2026-09-02 Two things that got in the way of reading are fixed. · Tables were pushed off the screen and lost their right-hand columns Cells with long text now wrap, and a table that still does not fit scrolls sideways · Supplementary problems were mixed in with a lesson's own problems They now sit in their own "Supplement" section with a label on each They do not count toward progress, and open with the subject pack ## More apps by CHUNGKIL KIM - [PDF - crop question paper](https://appshunter.io/ios/app/pdf-crop-question-paper/id1450818202) - [Day2U - D-Day Countdown](https://appshunter.io/ios/app/day2u-d-day-countdown/id1456616742) - [StellerVoyage](https://appshunter.io/ios/app/stellervoyage/id6757396559) - [Heliosphere - Solar System](https://appshunter.io/ios/app/heliosphere-solar-system/id6757491622) - [Brick Rogue](https://appshunter.io/ios/app/brick-rogue/id6757966656) - [Pixel Knight Run](https://appshunter.io/ios/app/pixel-knight-run/id6757982643) All apps by CHUNGKIL KIM: https://appshunter.io/developer/960187999 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-10.*