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
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