# Physics Toolbox Magnetometer vs Uncertainty Calculator

The clearest difference is price: Physics Toolbox Magnetometer at Free against Uncertainty Calculator's $3.99. Physics Toolbox Magnetometer also leads on ratings volume (7 vs 1). Uncertainty Calculator's advantage is in-app purchases (none vs 1) and update cadence (every 3 months vs every 13 months). On rating, ads, device support and iOS requirement there is nothing between them.

Physics Toolbox Magnetometer is free to download; Uncertainty Calculator costs $3.99 up front. Physics Toolbox Magnetometer 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 Physics Toolbox Magnetometer against 5.0 for Uncertainty Calculator. That said, the two scores are not equally well evidenced: Physics Toolbox Magnetometer has 7 ratings behind it against 1, so its average is the more settled of the two.

Physics Toolbox Magnetometer ships an update every 13 months, Uncertainty Calculator every 3 months. The most recent releases landed on September 23, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Physics Toolbox Magnetometer | Uncertainty Calculator |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [5.0 (7 ratings)](https://appshunter.io/ios/app/physics-toolbox-magnetometer/id1003749103/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews) |
| Number of ratings | **7** | 1 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 months** |
| Monetization | **Free** | Paid |
| Size | 17 MB | 1 MB |
| Requires iOS | 17.1 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chrystian Vieyra](https://appshunter.io/developer/998187453) | [Roman Volinsky](https://appshunter.io/developer/977951850) |

## What reviewers say

### Physics Toolbox Magnetometer

[App page](https://appshunter.io/ios/app/physics-toolbox-magnetometer/id1003749103)

This app transforms your iPhone into a precise scientific instrument for measuring, visualizing, and recording magnetic fields. Explore magnetic field vectors, magnitudes, and compass headings with real-time charts and digital readouts. Ideal for educational experiments, lab work, or curious exploration.

**Highlights:** Real-time magnetic field vector and magnitude display, Chart, digital, and compass viewing modes, Data recording and CSV export, Adjustable sample rate (1-100 Hz), Signal filters for noise reduction, Detection of permanent and electromagnetic fields

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Upgrade | $2.99 | 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 Physics Toolbox Magnetometer free?

Physics Toolbox Magnetometer 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, Physics Toolbox Magnetometer or Uncertainty Calculator?

Physics Toolbox Magnetometer and Uncertainty Calculator are both rated 5.0 out of 5 on the App Store, from 7 and 1 ratings respectively.

### Do Physics Toolbox Magnetometer or Uncertainty Calculator have ads?

Neither Physics Toolbox Magnetometer nor Uncertainty Calculator shows ads.

### Which is updated more often, Physics Toolbox Magnetometer or Uncertainty Calculator?

Physics Toolbox Magnetometer ships an update every 13 months, and Uncertainty Calculator every 3 months. Most recently, Physics Toolbox Magnetometer was updated on September 23, 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.*