# Vibration Meter, seismograph vs Key Library

The clearest difference is iOS requirement: Vibration Meter, seismograph at 12.0 against Key Library's 18.6. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Vibration Meter, seismograph sells 1 one-off in-app purchase and Key Library sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Vibration Meter, seismograph | Key Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (729 ratings)](https://appshunter.io/ios/app/vibration-meter-seismograph/id1137580201/reviews)** | — |
| Number of ratings | **729** | — |
| Positive reviews | 41.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 18 MB | 4 MB |
| Requires iOS | **12.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ExaMobile S.A.](https://appshunter.io/developer/506014841) | [JOSHUA ADAM PEARCE-GARCIA](https://appshunter.io/developer/6801278941) |

## What reviewers say

### Vibration Meter, seismograph

[App page](https://appshunter.io/ios/app/vibration-meter-seismograph/id1137580201)

This application uses your phone's accelerometer to measure and record vibrations from various sources, including earthquakes and everyday objects. It displays ground motion on a graph and uses an instrumental intensity scale for analysis. You can also monitor and share your measurement results.

**Highlights:** Measures vibration strength, Detects seismic waves, Uses accelerometer for analysis, Displays ground motion graph, Utilizes instrumental intensity scale, Monitors and shares results

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $1.99 | one-time |


### Key Library

[App page](https://appshunter.io/ios/app/key-library/id6801278939)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $4.99 | one-time |
| Unlimited | $12.99 | one-time |


## Frequently asked questions

### Is Vibration Meter, seismograph free?

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

### Is Key Library free?

Key Library is free to download, with in-app purchases available.

### Do Vibration Meter, seismograph or Key Library have ads?

Neither Vibration Meter, seismograph nor Key Library shows ads.

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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.*