# Mount Kelvin vs Motion Sensor Analyzer Tool

The clearest difference is in-app purchases: Mount Kelvin at none against Motion Sensor Analyzer Tool's 3. Mount Kelvin also leads on iOS requirement (9.0 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Motion Sensor Analyzer Tool sells 3 in-app purchases, starting at $2.99 per month. Mount Kelvin asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 11, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Mount Kelvin | Motion Sensor Analyzer Tool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/motion-sensor-analyzer-tool/id6499396038/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | — | Free |
| Size | 11 MB | 12 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mired Hill](https://appshunter.io/developer/1783816229) | [Thiem Nguyen](https://appshunter.io/developer/1658699065) |

## What reviewers say

### Mount Kelvin

[App page](https://appshunter.io/ios/app/mount-kelvin/id1055012111)

**Features:** macOS Compatibility

**In-app purchases:** none


### Motion Sensor Analyzer Tool

[App page](https://appshunter.io/ios/app/motion-sensor-analyzer-tool/id6499396038)

This app transforms your iPhone into a professional motion data logger. Record accelerometer, gyroscope, and magnetometer data simultaneously, visualize it with interactive charts, and export it in CSV or JSON format for detailed analysis. Organize and compare recordings to gain insights into motion patterns.

**Highlights:** Record accelerometer, gyroscope, magnetometer, Up to 200Hz sampling rate, Interactive real-time charts, Export data as CSV and JSON, Organize recordings with sessions and collections, Compare multiple recordings, Background recording (Pro feature)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Motion Sensor Pro – Monthly | $2.99 | per month |
| Motion Sensor Pro – Yearly | $19.99 | per year |
| Motion Sensor Pro – Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Mount Kelvin free?

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

### Is Motion Sensor Analyzer Tool free?

Motion Sensor Analyzer Tool is free to download, with in-app purchases available.

### Do Mount Kelvin or Motion Sensor Analyzer Tool have ads?

Neither Mount Kelvin nor Motion Sensor Analyzer Tool shows ads.

### Which is updated more often, Mount Kelvin or Motion Sensor Analyzer Tool?

Mount Kelvin ships an update every 2 weeks, and Motion Sensor Analyzer Tool every 2 weeks. Most recently, Mount Kelvin was updated on September 11, 2026 and Motion Sensor Analyzer Tool on September 21, 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.*