# Uncertainty Calculator vs Scratch启蒙

The clearest difference is price: Scratch启蒙 at Free against Uncertainty Calculator's $3.99. Scratch启蒙 also leads on ratings volume (76 vs 1) and update cadence (monthly vs every 3 months). Uncertainty Calculator's advantage is rating (5.0 vs 3.5) and in-app purchases (none vs 5). On ads and device support there is nothing between them.

Scratch启蒙 is free to download; Uncertainty Calculator costs $3.99 up front. Scratch启蒙 sells 5 one-off in-app purchases. Uncertainty Calculator asks for nothing beyond the download.

Uncertainty Calculator holds the better App Store score, 5.0 against 3.5. That said, the two scores are not equally well evidenced: Scratch启蒙 has 76 ratings behind it against 1, so its average is the more settled of the two.

Uncertainty Calculator ships an update every 3 months, Scratch启蒙 monthly. The most recent releases landed on September 14, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | Uncertainty Calculator | Scratch启蒙 |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews)** | [3.5 (76 ratings)](https://appshunter.io/ios/app/scratch/id1480615978/reviews) |
| Number of ratings | 1 | **76** |
| Positive reviews | — | 56.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 327 MB |
| Requires iOS | 17.0 | **9.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Beijing Reado Technology Co., Ltd.](https://appshunter.io/developer/1104903434) |

## 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


### Scratch启蒙

[App page](https://appshunter.io/ios/app/scratch/id1480615978)

This app introduces young children (5-7 years old) to programming through interactive stories and games. Using visual blocks, kids can animate characters, create their own art, record sounds, and incorporate photos to bring their ideas to life. It's designed to foster computational thinking and creativity in an engaging, age-appropriate way.

**Highlights:** Interactive stories and games, Graphical programming blocks, Character animation, Customizable drawing editor, Voice recording, Photo integration

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 平台基础会员 | $12.99 | one-time |
| 启蒙基础课程 | $25.99 | one-time |
| 启蒙系列课程 | $59.99 | one-time |
| 高级系列课程 | $89.99 | one-time |
| 平台全部课程和素材 | $124.99 | one-time |

**What reviewers like**

- ✨ Offline Scratch/ScratchJr
- 💡 More blocks and scenes
- 🚀 Good for making games
- 👍 Combines Scratch and ScratchJr
- 🌟 Improved ScratchJr version

**What reviewers complain about**

- ❌ Primarily in Japanese/Chinese
- 🔒 Many features locked/require membership
- 💸 Forced payment/expensive membership
- 🐛 Glitchy and buggy
- 🚫 Cannot save projects

**Reported bugs**

- App reloads by itself
- Sprites/animations not saving
- Cannot log into account
- Cannot register
- App kicks user off

**Requested features**

- Add English language support
- Remove membership requirement
- Fix save project functionality
- Improve performance
- Add physics and keyboard support


## Frequently asked questions

### Is Uncertainty Calculator free?

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

### Is Scratch启蒙 free?

Scratch启蒙 is free to download, with in-app purchases available.

### Which has better reviews, Uncertainty Calculator or Scratch启蒙?

Uncertainty Calculator is rated higher. Uncertainty Calculator averages 5.0 out of 5 from 1 ratings, while Scratch启蒙 averages 3.5 from 76 ratings.

### Do Uncertainty Calculator or Scratch启蒙 have ads?

Neither Uncertainty Calculator nor Scratch启蒙 shows ads.

### Which is updated more often, Uncertainty Calculator or Scratch启蒙?

Uncertainty Calculator ships an update every 3 months, and Scratch启蒙 monthly. Most recently, Uncertainty Calculator was updated on September 14, 2026 and Scratch启蒙 on August 16, 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.*