# Uncertainty Calculator vs 多次元雅思

The clearest difference is price: 多次元雅思 at Free against Uncertainty Calculator's $3.99. 多次元雅思 also leads on update cadence (every 5 days vs every 3 months) and ratings volume (22 vs 1). Uncertainty Calculator's advantage is in-app purchases (none vs 3). On rating, ads and device support there is nothing between them.

多次元雅思 is free to download; Uncertainty Calculator costs $3.99 up front. 多次元雅思 sells 3 one-off in-app purchases. Uncertainty Calculator asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Uncertainty Calculator against 5.0 for 多次元雅思. That said, the two scores are not equally well evidenced: 多次元雅思 has 22 ratings behind it against 1, so its average is the more settled of the two.

Uncertainty Calculator ships an update every 3 months, 多次元雅思 every 5 days. The most recent releases landed on October 18, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Uncertainty Calculator | 多次元雅思 |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews) | [5.0 (22 ratings)](https://appshunter.io/ios/app/id6446015800/reviews) |
| Number of ratings | 1 | **22** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 471 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [湖南多次元网络科技有限公司](https://appshunter.io/developer/1659989429) |

## What reviewers say

### Uncertainty Calculator

[App page](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440)

This app allows users to perform error propagation calculations for mathematical expressions involving uncertain variables. It supports absolute and relative error inputs, various functions, and trigonometric calculations in degrees or radians. The tool helps ensure accurate reporting of results based on estimated errors.

**Highlights:** Error propagation calculations, Absolute and relative error input, Support for mathematical functions, Trigonometric calculations (degrees/radians), Variable combination in expressions, Significant figure guidance

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### 多次元雅思

[App page](https://appshunter.io/ios/app/id6446015800)

This comprehensive tool offers a complete set of IELTS practice tests and preparation strategies. It features AI-powered listening and speaking practice, online assessments, and extensive study materials to help users improve their scores.

**Highlights:** IELTS practice tests (Reading, Listening, Speaking, Writing), AI-powered listening and speaking practice, Online assessment for skill evaluation, High-score model answers and strategies, Extensive study materials and exam tips, Cloud sync and offline practice

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月会员 | $9.99 | one-time |
| 季会员 | $24.99 | one-time |
| 年会员 | $89.99 | one-time |


## Frequently asked questions

### Is Uncertainty Calculator free?

Uncertainty Calculator costs $3.99, with no in-app purchases.

### Is 多次元雅思 free?

多次元雅思 is free to download, with in-app purchases available.

### Which has better reviews, Uncertainty Calculator or 多次元雅思?

Uncertainty Calculator and 多次元雅思 are both rated 5.0 out of 5 on the App Store, from 1 and 22 ratings respectively.

### Do Uncertainty Calculator or 多次元雅思 have ads?

Neither Uncertainty Calculator nor 多次元雅思 shows ads.

### Which is updated more often, Uncertainty Calculator or 多次元雅思?

Uncertainty Calculator ships an update every 3 months, and 多次元雅思 every 5 days. Most recently, Uncertainty Calculator was updated on October 18, 2026 and 多次元雅思 on October 23, 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.*