# Device Motion Detective vs Chronographer

The clearest difference is review sentiment: Chronographer at 50% against Device Motion Detective's 0%. Chronographer also leads on rating (3.0 vs 1.0) and update cadence (every 2 months vs every 13 months). Device Motion Detective's advantage is iOS requirement (12.0 vs 18.6). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Chronographer holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 4 respectively. Written reviews point the same way: 0% of Device Motion Detective's written reviews are positive against 50% of Chronographer's.

Device Motion Detective ships an update every 13 months, Chronographer every 2 months. The most recent releases landed on September 20, 2026 and August 9, 2026 respectively.

## The numbers

| Metric | Device Motion Detective | Chronographer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/device-motion-detective/id884501447/reviews) | **[3.0 (4 ratings)](https://appshunter.io/ios/app/chronographer/id6448242917/reviews)** |
| Number of ratings | 1 | **4** |
| Positive reviews | 0.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 2 MB | 3 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [方 沈](https://appshunter.io/developer/882296318) | [Robert France](https://appshunter.io/developer/1684138105) |

## 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


### Chronographer

[App page](https://appshunter.io/ios/app/chronographer/id6448242917)

This app helps you meticulously track the accuracy of your mechanical watches. It records time differences, calculates detailed performance metrics, and visualizes trends with charts and histograms. You can also manage your watch collection, log daily wear, and analyze positional variations.

**Highlights:** Track mechanical watch accuracy, Calculate detailed performance metrics, Visualize accuracy with charts and histograms, Manage watch collection with notes and photos, Log daily watch wear, Analyze positional variation, Export watch data

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

**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 Chronographer free?

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

### Which has better reviews, Device Motion Detective or Chronographer?

Chronographer is rated higher. Device Motion Detective averages 1.0 out of 5 from 1 ratings, while Chronographer averages 3.0 from 4 ratings.

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

Neither Device Motion Detective nor Chronographer shows ads.

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

Device Motion Detective ships an update every 13 months, and Chronographer every 2 months. Most recently, Device Motion Detective was updated on September 20, 2026 and Chronographer on August 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.*