# Uncertainty Calculator vs Morse Decoded

The clearest difference is price: Morse Decoded at Free against Uncertainty Calculator's $3.99. Morse Decoded also leads on ratings volume (6 vs 1) and iOS requirement (15.1 vs 17.0). Uncertainty Calculator's advantage is in-app purchases (none vs 1) and ads (none vs shown). On rating and device support there is nothing between them.

Morse Decoded is free to download; Uncertainty Calculator costs $3.99 up front. Morse Decoded sells 1 one-off in-app purchase. 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 Morse Decoded. That said, the two scores are not equally well evidenced: Morse Decoded has 6 ratings behind it against 1, so its average is the more settled of the two.

Uncertainty Calculator ships an update every 3 months, Morse Decoded every 27 months. The most recent releases landed on September 14, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Uncertainty Calculator | Morse Decoded |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews) | [5.0 (6 ratings)](https://appshunter.io/ios/app/morse-decoded/id1578820123/reviews) |
| Number of ratings | 1 | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 months** | Every 27 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 47 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Henry Abrahamsen](https://appshunter.io/developer/1544660671) |

## 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


### Morse Decoded

[App page](https://appshunter.io/ios/app/morse-decoded/id1578820123)

Learn and practice Morse code with interactive stories and dedicated training modes for tapping, listening, and reading. Features adjustable difficulty, a text-to-Morse translator, and progress tracking with badges.

**Highlights:** Stories Mode for realistic transmissions, Tapping, Listening, and Reading practice modes, Adjustable WPM and Farnsworth timing, Text-to-Morse translator, Quick reference dictionary, Progress tracking with badges and stats

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $0.99 | one-time |


## Frequently asked questions

### Is Uncertainty Calculator free?

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

### Is Morse Decoded free?

Morse Decoded is free to download, with in-app purchases available.

### Which has better reviews, Uncertainty Calculator or Morse Decoded?

Uncertainty Calculator and Morse Decoded are both rated 5.0 out of 5 on the App Store, from 1 and 6 ratings respectively.

### Do Uncertainty Calculator or Morse Decoded have ads?

Morse Decoded shows ads; Uncertainty Calculator does not.

### Which is updated more often, Uncertainty Calculator or Morse Decoded?

Uncertainty Calculator ships an update every 3 months, and Morse Decoded every 27 months. Most recently, Uncertainty Calculator was updated on September 14, 2026 and Morse Decoded on September 9, 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.*