# Vibration meter vs Roll Alarm

The clearest difference is price: Vibration meter at Free against Roll Alarm's $1.99. Vibration meter also leads on update cadence (monthly vs every 27 months). Roll Alarm's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Vibration meter is free to download; Roll Alarm costs $1.99 up front. Vibration meter sells 2 in-app purchases, starting at $0.99 per month. Roll Alarm asks for nothing beyond the download.

Vibration meter ships an update monthly, Roll Alarm every 27 months. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Vibration meter | Roll Alarm |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.4 (14 ratings)](https://appshunter.io/ios/app/vibration-meter-seismometer/id1373632255/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 27 months |
| Monetization | Free with in-app purchases | — |
| Size | 51 MB | 55 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [MYSTIC MOBILE APPS LLC](https://appshunter.io/developer/1481942662) | [Stevens Marketing Limited](https://appshunter.io/developer/1467103925) |

## What reviewers say

### Vibration meter

[App page](https://appshunter.io/ios/app/vibration-meter-seismometer/id1373632255)

Measure the strength of vibrations, tremors, and earthquakes using your phone's built-in seismograph. Visualize seismic movements on graphs, receive real-time Mercalli scale readings, and get instant alerts for seismic shocks. Data can be saved and shared for analysis.

**Highlights:** High-accuracy seismometer, Seismic wave detection, Detailed graphical analysis, Real-time Mercalli scale readings, Instant alerts for seismic shocks, Effortless data autosave, Apple Watch compatibility

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Vibration meter+ | $0.99 | per month |
| Annual Vibration meter+ | $5.99 | per year |


### Roll Alarm

[App page](https://appshunter.io/ios/app/roll-alarm/id1473896487)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Vibration meter free?

Vibration meter is free to download, with in-app purchases available.

### Is Roll Alarm free?

Roll Alarm costs $1.99, with no in-app purchases.

### Do Vibration meter or Roll Alarm have ads?

Vibration meter shows ads; Roll Alarm does not.

### Which is updated more often, Vibration meter or Roll Alarm?

Vibration meter ships an update monthly, and Roll Alarm every 27 months. Most recently, Vibration meter was updated on October 24, 2026 and Roll Alarm on October 20, 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.*