# Uncertainty Calculator vs Gradey

The clearest difference is price: Gradey at Free against Uncertainty Calculator's $3.99. Gradey also leads on update cadence (every 4 days vs every 3 months) and iOS requirement (14.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Gradey is free to download; Uncertainty Calculator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Uncertainty Calculator ships an update every 3 months, Gradey every 4 days. Both last shipped on November 2, 2026.

## The numbers

| Metric | Uncertainty Calculator | Gradey |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 14 MB |
| Requires iOS | 17.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [SozenTech Consulting Inc.](https://appshunter.io/developer/1431015360) |

## 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


### Gradey

[App page](https://appshunter.io/ios/app/gradey-grade-tracker/id1431015395)

Easily monitor your academic performance by tracking grades and assignments. This app offers flexible course setup with custom colors, GPA scales, and target grades, making it ideal for students of all levels.

**Highlights:** Custom course colors, GPA calculator, Average calculator, Track grades, Track assignments, Editable courses/assignments

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Uncertainty Calculator free?

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

### Is Gradey free?

Gradey is free to download, with no in-app purchases.

### Do Uncertainty Calculator or Gradey have ads?

Neither Uncertainty Calculator nor Gradey shows ads.

### Which is updated more often, Uncertainty Calculator or Gradey?

Uncertainty Calculator ships an update every 3 months, and Gradey every 4 days. Most recently, Uncertainty Calculator was updated on November 2, 2026 and Gradey on November 2, 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.*