# Sensor vs 4DI

The clearest difference is ads: 4DI at none against Sensor's shown. 4DI also leads on update cadence (every 5 days vs every 2 months) and iOS requirement (18.6 vs 27.0). Sensor's advantage is device support (3 vs 1). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Sensor ships an update every 2 months, 4DI every 5 days. The most recent releases landed on October 14, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Sensor | 4DI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/sensor-app/id1466399692/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free | — |
| Size | 47 MB | 5 MB |
| Requires iOS | 27.0 | **18.6** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Volker Schmitt](https://appshunter.io/developer/1466399691) | [Robert Poetzsch](https://appshunter.io/developer/1860642630) |

## What reviewers say

### Sensor

[App page](https://appshunter.io/ios/app/sensor-app/id1466399692)

Access and utilize all your device's sensors with this comprehensive tool. Explore GPS, gyroscope, acceleration, magnetometer, altimeter, and attitude data for various applications and research.

**Highlights:** Access GPS for precise location, Utilize gyroscope for orientation, Measure acceleration and movement, Detect magnetic fields with magnetometer, Access altimeter and pressure data, Monitor device attitude (roll, pitch, yaw)

**Features:** Apple Watch app

**In-app purchases:** none


### 4DI

[App page](https://appshunter.io/ios/app/4di-data-integrity-tool/id6760180866)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sensor free?

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

### Is 4DI free?

4DI is free to download, with no in-app purchases.

### Do Sensor or 4DI have ads?

Sensor shows ads; 4DI does not.

### Which is updated more often, Sensor or 4DI?

Sensor ships an update every 2 months, and 4DI every 5 days. Most recently, Sensor was updated on October 14, 2026 and 4DI on October 19, 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.*