# Magnetic Sensor vs Stair Stringer Calculator Pro

The clearest difference is in-app purchases: Magnetic Sensor at none against Stair Stringer Calculator Pro's 1. Magnetic Sensor also leads on iOS requirement (15.1 vs 17.0). Stair Stringer Calculator Pro's advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. Stair Stringer Calculator Pro sells 1 one-off in-app purchase. Magnetic Sensor asks for nothing beyond the download.

Magnetic Sensor ships an update fortnightly, Stair Stringer Calculator Pro every 3 weeks. The most recent releases landed on October 30, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Magnetic Sensor | Stair Stringer Calculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Size | 25 MB | 4 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Seonggon Sim](https://appshunter.io/developer/1565259950) | [京昌 陈](https://appshunter.io/developer/6783155021) |

## What reviewers say

### Magnetic Sensor

[App page](https://appshunter.io/ios/app/magnetic-sensor/id6764468454)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Stair Stringer Calculator Pro

[App page](https://appshunter.io/ios/app/stair-stringer-calculator-pro/id6817401495)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stair Stringer Pro | $9.99 | one-time |


## Frequently asked questions

### Is Magnetic Sensor free?

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

### Is Stair Stringer Calculator Pro free?

Stair Stringer Calculator Pro is free to download, with in-app purchases available.

### Do Magnetic Sensor or Stair Stringer Calculator Pro have ads?

Magnetic Sensor shows ads; Stair Stringer Calculator Pro does not.

### Which is updated more often, Magnetic Sensor or Stair Stringer Calculator Pro?

Magnetic Sensor ships an update fortnightly, and Stair Stringer Calculator Pro every 3 weeks. Most recently, Magnetic Sensor was updated on October 30, 2026 and Stair Stringer Calculator Pro on October 29, 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.*