# Rainbow Abacus

> Rainbow Abacus (iPhone/iPad app by Davison Design & Development, Inc.)

- Source: https://appshunter.io/ios/app/rainbow-abacus/id1498028310 (this page in markdown: same URL + `.md`)
- Developer: [Davison Design & Development, Inc](https://appshunter.io/developer/376004613)
- Category: Education
- Price: $2.99
- Age rating: 4+
- Requires: iOS 8.0 · 127 MB
- Languages: English
- Released: 2020-02-12
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/rainbow-abacus/id1498028310/reviews.md

## What is Rainbow Abacus?

The Rainbow Abacus contributes to improving the cognitive benefits children and beginners can gain from abacus use, thru employing the natural color spectrum order. By highlighting the interactive principle of the color spectrum order as a natural numerical placement and value system, children and beginners can easily adapt to the cognitive benefits of the world's oldest computer. The Rainbow Abacus App. includes a menu that includes:
•“How To Use” section, designed to acquaint beginners to setting up and solving problems on the Rainbow abacus,
•“Learn Abacus” section, designed to acquaint beginners to counting on the Rainbow Abacus including decimal placements, 
•“New Contest” section designed with challenging addition and subtraction problems to solve with a automatic calculating and score keeper reset button.
 
Features:
 
-based on the Japanese Soroban design, thirteen rows are featured
-thirteen rows allow for number and decimal placements
-seven row of beads follow the natural rainbow color order representing real number values
-six row of gray colored beads representing decimal values
-Black background to highlight the colored beads
-excellent tool for kids and adolescents to calculate and score their own progress
-simple tool for calculating from simple to more advanced problem solving
-on/off reset button for soothing background music to encourage concentration
-provides sound as each bead is moved up and down, to provide the tactile and auditory experience during counting and problem solving
-automatic score keeper for number of problems correctly solved
-reset button for counting
-counting range is from, 0.000000 to 9,000,000
-automatic abacus counting tally
-problem solving digits can range from single digits to 6 digits and up, that also includes decimals


## Version history (last 1 release)

### 1.2 — 2020-06-03

- improve game speed

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All apps by Davison Design & Development, Inc: https://appshunter.io/developer/376004613

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*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 2026-05-19.*