# HAM Test Prep vs Uncertainty Calculator

The clearest difference is ratings volume: HAM Test Prep at 312 against Uncertainty Calculator's 1. HAM Test Prep also leads on chart position (#171 vs unranked) and price ($2.99 vs $3.99). On rating, update cadence, ads and in-app purchases there is nothing between them.

HAM Test Prep costs $2.99 and Uncertainty Calculator $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for HAM Test Prep against 5.0 for Uncertainty Calculator. That said, the two scores are not equally well evidenced: HAM Test Prep has 312 ratings behind it against 1, so its average is the more settled of the two.

HAM Test Prep ships an update every 4 months, Uncertainty Calculator every 3 months. The most recent releases landed on October 8, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | HAM Test Prep | Uncertainty Calculator |
| --- | --- | --- |
| Price | **$2.99** | $3.99 |
| Rating | [4.9 (312 ratings)](https://appshunter.io/ios/app/ham-test-prep-extra/id298760002/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews)** |
| Number of ratings | **312** | 1 |
| Positive reviews | 97.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Best chart rank | **#171** | — |
| Size | 5 MB | 1 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Patrick J Maloney LLC](https://appshunter.io/developer/297951499) | [Roman Volinsky](https://appshunter.io/developer/977951850) |

## What reviewers say

### HAM Test Prep

[App page](https://appshunter.io/ios/app/ham-test-prep-extra/id298760002)

**Currently charting:** #171 Top Paid · Education (US App Store)

Prepare for your Amateur Radio Extra license exam with a comprehensive question pool and practice tests. Review FCC rules, get immediate feedback, and track your proficiency across question groups. Features include accessibility options and customizable test settings.

**Highlights:** Extra Question Pool (effective July 1, 2024), Practice Exams, Proficiency Tracking, Immediate Feedback, View FCC Rule Text, Zoomable Figures, Accessibility Options

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

**In-app purchases:** none

**What reviewers like**

- ✅ Effective exam preparation and high pass rates
- 📱 Convenient mobile access for studying anytime
- 🎯 Accurate and current question pools
- 📊 Tracks progress and identifies weak areas
- 🎮 Randomized questions prevent memorization by position

**What reviewers complain about**

- 🐛 Frequent app crashes during use
- ❌ Limited practice modes (only randomize tests)
- 🔧 Confusing logic and navigation initially
- 📍 No 'where I left off' bookmark feature

**Reported bugs**

- App crashes almost every time a menu item is selected
- Cannot reset review question selection
- Crashes during long study or test sessions

**Requested features**

- Bookmark or 'where I left off' feature for resuming sessions
- Ability to reset review question selection
- Option to randomize answer order in practice question pools
- Non-randomized practice mode alongside randomized tests


### 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


## Frequently asked questions

### Is HAM Test Prep free?

HAM Test Prep costs $2.99, with no in-app purchases.

### Is Uncertainty Calculator free?

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

### Which has better reviews, HAM Test Prep or Uncertainty Calculator?

Uncertainty Calculator is rated higher. HAM Test Prep averages 4.9 out of 5 from 312 ratings, while Uncertainty Calculator averages 5.0 from 1 ratings.

### Do HAM Test Prep or Uncertainty Calculator have ads?

Neither HAM Test Prep nor Uncertainty Calculator shows ads.

### Which is updated more often, HAM Test Prep or Uncertainty Calculator?

HAM Test Prep ships an update every 4 months, and Uncertainty Calculator every 3 months. Most recently, HAM Test Prep was updated on October 8, 2026 and Uncertainty Calculator on October 2, 2026.

---

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