# LetAbacus - Soroban for Kids — Mental math, no ads, offline

> Mental math, no ads, offline (iPhone/iPad app by RUEI YI WU.)

- Source: https://appshunter.io/ios/app/letabacus-soroban-for-kids/id6796994872 (this page in markdown: same URL + `.md`)
- Developer: [RUEI YI WU](https://appshunter.io/developer/1896714956)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English
- Released: 2026-08-10
- Data updated: 2026-08-17
- User reviews in markdown: https://appshunter.io/ios/app/letabacus-soroban-for-kids/id6796994872/reviews.md

## What is LetAbacus?

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: 8 units, 18 lessons — from meeting the abacus and simple add &
  subtract, through friends-of-5, friends-of-10, mixed complements and running
  sums, to a final challenge-cup unit. Every lesson in three steps — watch,
  follow the glowing beads, then try it yourself for three stars.
‧ 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: read the number, flick the beads. Difficulty follows your
  child's lesson progress — it never asks what hasn't been taught yet.
‧ 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.
‧ Bead skins to collect: wooden, candy, starry night, dino and more — 9 skins,
  all unlocked by practicing — never bought with money.
‧ Voice encouragement in both English and Traditional Chinese.
‧ A parent zone behind a parental gate: progress overview, a "5 minutes today"
  suggestion, 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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Tip Jar - Small | $0.99 | one-time |
| Medium Coffee | $4.99 | one-time |
| Large Coffee | $9.99 | one-time |



## Version history (last 1 release)

### 1.0.20260801 — 2026-08-10

No release notes.

## More apps by RUEI YI WU

- [Lode: Notes, Voice & Scan](https://appshunter.io/ios/app/lode-notes-voice-and-scan/id6775551126)
- [SunnyWalker](https://appshunter.io/ios/app/sunnywalker/id6775802674)
- [LetPiano - Piano for Kids](https://appshunter.io/ios/app/letpiano-piano-for-kids/id6782109761)
- [五子棋小學堂 Gomoku Kids](https://appshunter.io/ios/app/gomoku-kids/id6784641055)
- [Go Kids: Weiqi & Capture](https://appshunter.io/ios/app/go-kids-weiqi-and-capture/id6784736767)
- [Bloomling: Learn & Safe Web](https://appshunter.io/ios/app/bloomling-learn-and-safe-web/id6785049588)

All apps by RUEI YI WU: https://appshunter.io/developer/1896714956

---

*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 2026-08-17.*