# Uncertainty Calculator vs Reentry AR

The clearest difference is price: Reentry AR at Free against Uncertainty Calculator's $3.99. Reentry AR also leads on update cadence (every 3 days vs every 3 months) and iOS requirement (13.2 vs 17.0). On rating, ratings volume, ads and in-app purchases there is nothing between them.

Reentry AR is free to download; Uncertainty Calculator costs $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 — 5.0 for Uncertainty Calculator against 5.0 for Reentry AR. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Uncertainty Calculator ships an update every 3 months, Reentry AR every 3 days. The most recent releases landed on September 14, 2026 and September 2, 2026 respectively.

## The numbers

| Metric | Uncertainty Calculator | Reentry AR |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/reentry-ar/id1536701365/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 10 MB |
| Requires iOS | 17.0 | **13.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Toriningen Co.,Ltd.](https://appshunter.io/developer/361194121) |

## 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


### Reentry AR

[App page](https://appshunter.io/ios/app/reentry-ar/id1536701365)

Experience the return of the Hayabusa2 re-entry capsule in augmented reality. This application visualizes the capsule's trajectory as it lands in South Australia, overlaid onto your device's camera view.

**Highlights:** Augmented reality trajectory display, Visualizes re-entry capsule path, Overlays on camera feed, Educational space mission data

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Uncertainty Calculator free?

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

### Is Reentry AR free?

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

### Which has better reviews, Uncertainty Calculator or Reentry AR?

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

### Do Uncertainty Calculator or Reentry AR have ads?

Neither Uncertainty Calculator nor Reentry AR shows ads.

### Which is updated more often, Uncertainty Calculator or Reentry AR?

Uncertainty Calculator ships an update every 3 months, and Reentry AR every 3 days. Most recently, Uncertainty Calculator was updated on September 14, 2026 and Reentry AR on September 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.*