# Seismometer ∞ vs Gyroscope ∞ Rotation Sensor

The clearest difference is in-app purchases: Seismometer ∞ at none against Gyroscope ∞ Rotation Sensor's 2. Seismometer ∞ also leads on update cadence (every 2 weeks vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Gyroscope ∞ Rotation Sensor sells 2 in-app purchases, starting at $1.99 per month. Seismometer ∞ asks for nothing beyond the download.

Seismometer ∞ ships an update every 2 weeks, Gyroscope ∞ Rotation Sensor monthly. The most recent releases landed on September 12, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Seismometer ∞ | Gyroscope ∞ Rotation Sensor |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gyroscope-rotation-sensor/id6774744125/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | — | Free with in-app purchases |
| Size | 16 MB | 16 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [辰巳家有限公司](https://appshunter.io/developer/1781943256) | [Fawkes Wei](https://appshunter.io/developer/432767536) |

## What reviewers say

### Seismometer ∞

[App page](https://appshunter.io/ios/app/seismometer/id6761700650)

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

**In-app purchases:** none


### Gyroscope ∞ Rotation Sensor

[App page](https://appshunter.io/ios/app/gyroscope-rotation-sensor/id6774744125)

Visualize your device's real-time rotation and angular velocity across three axes. Switch between degrees and radians per second for precise measurements. Offers a clean, distraction-free interface for understanding sensor data.

**Highlights:** Live 3-axis rotation chart, Degrees/second and radians/second modes, Smooth, bias-removed sensor readings, Distraction-free design, Real-time visualization

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Seismometer ∞ free?

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

### Is Gyroscope ∞ Rotation Sensor free?

Gyroscope ∞ Rotation Sensor is free to download, with in-app purchases available.

### Do Seismometer ∞ or Gyroscope ∞ Rotation Sensor have ads?

Both Seismometer ∞ and Gyroscope ∞ Rotation Sensor show ads.

### Which is updated more often, Seismometer ∞ or Gyroscope ∞ Rotation Sensor?

Seismometer ∞ ships an update every 2 weeks, and Gyroscope ∞ Rotation Sensor monthly. Most recently, Seismometer ∞ was updated on September 12, 2026 and Gyroscope ∞ Rotation Sensor on September 25, 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.*