# Device Motion Detective vs ErgoArmMeter

The clearest difference is update cadence: ErgoArmMeter at every 4 months against Device Motion Detective's every 13 months. ErgoArmMeter also leads on iOS requirement (8.1 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Device Motion Detective ships an update every 13 months, ErgoArmMeter every 4 months. The most recent releases landed on October 7, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Device Motion Detective | ErgoArmMeter |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/device-motion-detective/id884501447/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 4 months** |
| Monetization | Free | — |
| Size | 2 MB | 11 MB |
| Requires iOS | 12.0 | **8.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [方 沈](https://appshunter.io/developer/882296318) | [Karolinska Institutet](https://appshunter.io/developer/969523861) |

## What reviewers say

### Device Motion Detective

[App page](https://appshunter.io/ios/app/device-motion-detective/id884501447)

This utility app captures and stores detailed device motion data, including accelerometer, gyroscope, and magnetometer readings. Users can view real-time motion graphs or past records saved to the database. Data is recorded every second for up to 20 minutes per session.

**Highlights:** Raw accelerometer data recording, Raw gyroscope data recording, Raw magnetometer data recording, Processed device-motion data, Real-time motion graphs, Past motion record viewing, Data saved to database

**Features:** Vision Pro support

**In-app purchases:** none


### ErgoArmMeter

[App page](https://appshunter.io/ios/app/ergoarmmeter/id1042947334)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Device Motion Detective free?

Device Motion Detective is free to download, with no in-app purchases.

### Is ErgoArmMeter free?

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

### Do Device Motion Detective or ErgoArmMeter have ads?

Neither Device Motion Detective nor ErgoArmMeter shows ads.

### Which is updated more often, Device Motion Detective or ErgoArmMeter?

Device Motion Detective ships an update every 13 months, and ErgoArmMeter every 4 months. Most recently, Device Motion Detective was updated on October 7, 2026 and ErgoArmMeter on October 9, 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.*