# 4D Motion vs GPS Twin Odometers

The clearest difference is price: 4D Motion at Free against GPS Twin Odometers's $12.99. 4D Motion also leads on rating (3.8 vs 3.0) and update cadence (monthly vs every 7 months). GPS Twin Odometers's advantage is in-app purchases (none vs 6). On review sentiment, ads, device support and iOS requirement there is nothing between them.

4D Motion is free to download; GPS Twin Odometers costs $12.99 up front. 4D Motion sells 6 one-off in-app purchases. GPS Twin Odometers asks for nothing beyond the download.

4D Motion holds the better App Store score, 3.8 against 3.0. That said, the two scores are not equally well evidenced: 4D Motion has 27 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 50% and 50% positive.

4D Motion ships an update monthly, GPS Twin Odometers every 7 months. Both last shipped on November 2, 2026.

## The numbers

| Metric | 4D Motion | GPS Twin Odometers |
| --- | --- | --- |
| Price | **Free** | $12.99 |
| Rating | **[3.8 (27 ratings)](https://appshunter.io/ios/app/4d-motion/id1144926430/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/gps-twin-odometers/id1366967175/reviews) |
| Number of ratings | **27** | 2 |
| Positive reviews | 50.0% of reviews | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Monthly** | Every 7 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 420 MB | 1 MB |
| Requires iOS | 14.0 | **13.6** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Ssam Sports, Inc.](https://appshunter.io/developer/1144926429) | [MSYapps](https://appshunter.io/developer/458482419) |

## What reviewers say

### 4D Motion

[App page](https://appshunter.io/ios/app/4d-motion/id1144926430)

Learn, analyze, and train human motion for sports, conditioning, and physical therapy. Features interactive 3D tutorials, swing analysis by comparing your recordings to pro models, and motion capture for detailed performance training and rehabilitation.

**Highlights:** Interactive 3D golf tutorials, Compare your motion to pro models, Record and overlay your video with 3D models, 3D motion capture for analysis, Performance training and physical therapy tools, Analyze golf, baseball, and conditioning movements

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock 3D video comparison | $0.99 | one-time |
| 10 swing pack | $2.99 | one-time |
| Unlock more swings | $4.99 | one-time |
| 30 swing pack | $6.99 | one-time |
| 80 swing pack | $15.99 | one-time |
| 750 swing pack | $99.99 | one-time |


### GPS Twin Odometers

[App page](https://appshunter.io/ios/app/gps-twin-odometers/id1366967175)

This app provides dual odometers, clocks, and stopwatches for historic, classic, and vintage road rallies. It uses device GPS for accurate distance measurement and offers multiple modes for timing and tracking stages. Log your data with geographic coordinates for detailed record-keeping.

**Highlights:** Dual odometers with two decimal place accuracy, Integrated stopwatch and clock functions, GPS-based distance measurement, Three operational modes: Regularity, Jogularity, Lap, Distance logging with geographic coordinates, Option to subtract distance when off-course, Choice between miles or kilometers

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

**In-app purchases:** none


## Frequently asked questions

### Is 4D Motion free?

4D Motion is free to download, with in-app purchases available.

### Is GPS Twin Odometers free?

GPS Twin Odometers costs $12.99, with no in-app purchases.

### Which has better reviews, 4D Motion or GPS Twin Odometers?

4D Motion is rated higher. 4D Motion averages 3.8 out of 5 from 27 ratings, while GPS Twin Odometers averages 3.0 from 2 ratings.

### Do 4D Motion or GPS Twin Odometers have ads?

Neither 4D Motion nor GPS Twin Odometers shows ads.

### Which is updated more often, 4D Motion or GPS Twin Odometers?

4D Motion ships an update monthly, and GPS Twin Odometers every 7 months. Most recently, 4D Motion was updated on November 2, 2026 and GPS Twin Odometers on November 2, 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.*