# Physics Toolbox Magnetometer vs Alfredo Backer

The clearest difference is in-app purchases: Alfredo Backer at none against Physics Toolbox Magnetometer's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Physics Toolbox Magnetometer sells 1 one-off in-app purchase. Alfredo Backer asks for nothing beyond the download.

Physics Toolbox Magnetometer ships an update every 13 months, Alfredo Backer every 8 months. The most recent releases landed on September 23, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Physics Toolbox Magnetometer | Alfredo Backer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/physics-toolbox-magnetometer/id1003749103/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 8 months** |
| Monetization | Free | — |
| Size | 17 MB | 55 MB |
| Requires iOS | 17.1 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chrystian Vieyra](https://appshunter.io/developer/998187453) | [Externato Alfredo Backer Ltda](https://appshunter.io/developer/1535072495) |

## 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 |


### Alfredo Backer

[App page](https://appshunter.io/ios/app/alfredo-backer/id1212354980)

**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 Alfredo Backer free?

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

### Do Physics Toolbox Magnetometer or Alfredo Backer have ads?

Neither Physics Toolbox Magnetometer nor Alfredo Backer shows ads.

### Which is updated more often, Physics Toolbox Magnetometer or Alfredo Backer?

Physics Toolbox Magnetometer ships an update every 13 months, and Alfredo Backer every 8 months. Most recently, Physics Toolbox Magnetometer was updated on September 23, 2026 and Alfredo Backer on September 18, 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.*