# Exam Reader vs Uncertainty Calculator

The clearest difference is price: Exam Reader at Free against Uncertainty Calculator's $3.99. Exam Reader also leads on update cadence (every 3 weeks vs every 3 months) and ratings volume (11 vs 1). Uncertainty Calculator's advantage is rating (5.0 vs 3.5) and in-app purchases (none vs 7). On ads and device support there is nothing between them.

Exam Reader is free to download; Uncertainty Calculator costs $3.99 up front. Exam Reader sells 7 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: Exam Reader has 11 ratings behind it against 1, so its average is the more settled of the two.

Exam Reader ships an update every 3 weeks, Uncertainty Calculator every 3 months. The most recent releases landed on August 12, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Exam Reader | Uncertainty Calculator |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [3.5 (11 ratings)](https://appshunter.io/ios/app/exam-reader-optical-test-grade/id1087908283/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews)** |
| Number of ratings | **11** | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 95 MB | 1 MB |
| Requires iOS | **12.2** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [BULENT EREN](https://appshunter.io/developer/1087908282) | [Roman Volinsky](https://appshunter.io/developer/977951850) |

## What reviewers say

### Exam Reader

[App page](https://appshunter.io/ios/app/exam-reader-optical-test-grade/id1087908283)

Instantly grade multiple-choice tests, quizzes, and assessments using your device's camera. This app can read handwritten marks and supports custom sheet creation, offering a 100% success rate when used as described.

**Highlights:** Camera-based grading scanner, Reads over-written marks, Supports 5-200 questions, Custom answer sheet generator, Horizontal and vertical sheet support, Right-to-left sheet support, Griddable questions support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 300 Test Grading / Exam Reading Credit | $0.99 | one-time |
| Unlimited cloud usage & grading for 2 months | $1.99 | one-time |
| 100 exam grading / scanning | $3.99 | one-time |
| 1000 exam grading / scanning | $3.99 | one-time |
| 250 exam grading / scanning | $6.99 | one-time |
| 500 exam grading / scanning | $8.99 | one-time |
| Unlimited cloud usage & grading for 1 year | $9.99 | one-time |


### 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 Exam Reader free?

Exam Reader is free to download, with in-app purchases available.

### Is Uncertainty Calculator free?

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

### Which has better reviews, Exam Reader or Uncertainty Calculator?

Uncertainty Calculator is rated higher. Exam Reader averages 3.5 out of 5 from 11 ratings, while Uncertainty Calculator averages 5.0 from 1 ratings.

### Do Exam Reader or Uncertainty Calculator have ads?

Neither Exam Reader nor Uncertainty Calculator shows ads.

### Which is updated more often, Exam Reader or Uncertainty Calculator?

Exam Reader ships an update every 3 weeks, and Uncertainty Calculator every 3 months. Most recently, Exam Reader was updated on August 12, 2026 and Uncertainty Calculator on September 14, 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.*