UMA Abacus vs Star Exploration
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UMA Abacus
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Use iPad or iPhone as abacus to learn traditional abacus method. It is easy and fun. We have used iPad to teach abacus for more than 10 years. It is the easiest way of learning abacus. With iPad virtual abacus, we can customise the syllabus for each student with his own version. We will always provide the most efficient syllabus for each kid and they can alway learn with the optimal speeds. With iPad virtual abacus, we can build a learning path for the kid that is easier to follow up and you will not easily get stuck with the books as the only tool like the traditional method of learning abacus.
Star Exploration
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1. About Star Exploration Star Exploration is a novel and interesting game of reasoning. The star map is divided into multiple star regions, some of which have a planet with a color of red, yellow, and blue. The purpose of the game is to gather three planets of different colors together through movement, and there is only one aggregated planet in each sector area divided from the center of the circle. 2. How to Play a. Move: Each planet can only move up to one step. The blue planet can move diagonally by one grid, the green planet can move left and right or up and down by one grid, and the red planet can move up, down, left and right by two grid. b. Zoom: Click the + - button to zoom in or out on the star map. Drag and drop star map in the blank space. c. Undo: click the UNDO button in the upper right corner. d. Hint: click the HINT button right above.
Screenshots
Verdict
The clearest difference is in-app purchases: UMA Abacus at none against Star Exploration's 1. UMA Abacus also leads on update cadence (every 3 weeks vs every 10 months). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Star Exploration sells 1 one-off in-app purchase. UMA Abacus asks for nothing beyond the download.
UMA Abacus ships an update every 3 weeks, Star Exploration every 10 months. The most recent releases landed on September 17, 2026 and September 20, 2026 respectively.
| Parameter | UMA Abacus | Star Exploration |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.6 | 15.6 |
| Further details — not scored | ||
| Size | 73 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | shuihua zhu | 振华 许 |
In-app purchases
UMA Abacus
No in-app purchases
Star Exploration
- Full Version$0.99









