# UMA Abacus vs Star Exploration

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.

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.

## The numbers

| Metric | UMA Abacus | Star Exploration |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 10 months |
| Size | 73 MB | 5 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [shuihua zhu](https://appshunter.io/developer/1444836907) | [振华 许](https://appshunter.io/developer/1437340417) |

## What reviewers say

### UMA Abacus

[App page](https://appshunter.io/ios/app/uma-abacus/id1460627418)

**Features:** macOS Compatibility

**In-app purchases:** none


### Star Exploration

[App page](https://appshunter.io/ios/app/star-exploration/id6479958031)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $0.99 | one-time |


## Frequently asked questions

### Is UMA Abacus free?

UMA Abacus is free to download, with no in-app purchases.

### Is Star Exploration free?

Star Exploration is free to download, with in-app purchases available.

### Do UMA Abacus or Star Exploration have ads?

Neither UMA Abacus nor Star Exploration shows ads.

### Which is updated more often, UMA Abacus or Star Exploration?

UMA Abacus ships an update every 3 weeks, and Star Exploration every 10 months. Most recently, UMA Abacus was updated on September 17, 2026 and Star Exploration on September 20, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*