# Device Motion Detective vs Volume Lock

The clearest difference is in-app purchases: Device Motion Detective at none against Volume Lock's 3. Volume Lock's advantage is update cadence (every 4 weeks vs every 13 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Volume Lock sells 3 in-app purchases, starting at $0.99 per 7 days. Device Motion Detective asks for nothing beyond the download.

Device Motion Detective ships an update every 13 months, Volume Lock every 4 weeks. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Device Motion Detective | Volume Lock |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 4 weeks** |
| Monetization | Free | — |
| Size | 2 MB | 36 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [方 沈](https://appshunter.io/developer/882296318) | [Rizwan Rashid](https://appshunter.io/developer/1882819845) |

## 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


### Volume Lock

[App page](https://appshunter.io/ios/app/volume-lock-parental-control/id6760347207)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $0.99 | per 7 days |
| Monthly Premium | $2.99 | per month |
| Volume Lock & Limiter Pro | $14.99 | one-time |


## Frequently asked questions

### Is Device Motion Detective free?

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

### Is Volume Lock free?

Volume Lock is free to download, with in-app purchases available.

### Do Device Motion Detective or Volume Lock have ads?

Neither Device Motion Detective nor Volume Lock shows ads.

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

Device Motion Detective ships an update every 13 months, and Volume Lock every 4 weeks. Most recently, Device Motion Detective was updated on October 7, 2026 and Volume Lock on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*