LetAbacus - Soroban for Kids

A soroban (Japanese abacus) app that parents can safely hand to young kids. There is almost no text on screen — kids learn through animated demos, glowing beads and cheerful voice encouragement. Mistakes never get a big red X, just a friendly "try again!". ‧ A real-feel virtual abacus: multi-touch beads with a satisfying wooden click. ‧ Lesson mode: 19 units, 50 lessons — from meeting the abacus and simple add & subtract, through friends-of-5, friends-of-10, mixed complements, a place-value dojo, running sums, first multiplication and division and a four-ops cup, on to formal soroban multiplication and division with proper rod positioning — remainders, two-digit divisors and decimals included. Every lesson in three steps — watch, follow the glowing beads, then try it yourself for three stars. ‧ Understand first, then flick: before each complement unit, kids play a picture puzzle — "how many more to make 5 (or 10)?" — and after the lesson they solve it again with brand-new numbers, proving they truly got the idea. ‧ Mental math ladder: on the board, then flash, then air flick (invisible beads, real flicks), then pure mental math — moving the abacus into your child's head one step at a time. ‧ Sense Island: count at a glance, how-many-more to 5 and 10, which side has more, and peek-and-rebuild bead memory — number sense before numerals. ‧ Visual drills and Arena mode: difficulty follows your child's lesson progress, or pick your own level, earn points, and re-practice tricky ones. ‧ Listening drills at your child's pace: the app calls one term ("five"), waits until the beads really show 5, then calls the next ("plus three"). Three paces (slow / medium / fast), with one replay if missed. ‧ Big Review boss: mixed practice of everything learned, with a help-me button. ‧ Three little daily quests with a streak flame, plus a badge wall of silver and gold badges. ‧ Bead skins to collect: wooden, candy, starry night, dino, neon and more — 10 skins, all unlocked by practicing — never bought with money. ‧ Voice encouragement in both English and Traditional Chinese. ‧ A parent zone behind a parental gate: insight cards, a "5 minutes today" suggestion, a learning snapshot export, language and pace settings. Our promise: completely free, no ads, no tracking, no data collection. All learning content and progress work fully offline. An optional tip jar (buy the developer a coffee) lives behind the parental gate, is handled by Apple, is unreachable by children, and unlocks nothing.