# iSeismometer vs Terramoto

The clearest difference is price: iSeismometer at Free against Terramoto's $2.99. iSeismometer also leads on rating (3.6 vs 2.0) and ratings volume (172 vs 1). On update cadence, ads, in-app purchases and device support there is nothing between them.

iSeismometer is free to download; Terramoto costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iSeismometer holds the better App Store score, 3.6 against 2.0. That said, the two scores are not equally well evidenced: iSeismometer has 172 ratings behind it against 1, so its average is the more settled of the two.

iSeismometer ships an update every 7 months, Terramoto every 4 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | iSeismometer | Terramoto |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[3.6 (172 ratings)](https://appshunter.io/ios/app/iseismometer/id304190739/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/terramoto/id6759559589/reviews) |
| Number of ratings | **172** | 1 |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | **Free** | Paid |
| Size | 3 MB | 43 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [ObjectGraph LLC](https://appshunter.io/developer/284700705) | [Walter Tengler](https://appshunter.io/developer/1860699717) |

## What reviewers say

### iSeismometer

[App page](https://appshunter.io/ios/app/iseismometer/id304190739)

Transform your iPhone into a sensitive seismometer to detect and visualize vibrations. Explore its educational and data-collecting capabilities for fun or serious applications.

**Highlights:** Converts iPhone to seismometer, Detects and visualizes vibrations, Data collecting capabilities, Educational use, Adjustable frequency settings, Re-track previous data, X-Y-Z illustrated graphs

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Sensitive and accurate
- 👍 Simple and easy to use
- 💡 Useful for various applications (e.g. monitoring vibrations, detecting heartbeat)

**What reviewers complain about**

- 🐛 Crashes or freezes on newer devices
- 🔋 High battery consumption
- 🔒 Lacks security/privacy features (e.g. no option to disable data transmission)

**Reported bugs**

- Buttons/controls not working on newer iOS versions
- Keyboard not appearing in text input fields
- Inconsistent performance across device models

**Requested features**

- Add sensitivity control
- Implement zero control for reference plane
- Increase recording time
- Improve UI/UX (e.g. color coding, scrolling, chart speed control)
- Implement Richter scale or other measurement units


### Terramoto

[App page](https://appshunter.io/ios/app/terramoto/id6759559589)

Explore the science of earthquakes and tsunamis with a real-time physics simulator. Understand wave propagation, coastal flooding, and affected cities using accurate geophysical data. This app is for educational and entertainment purposes only, not for emergency warnings.

**Highlights:** Real-time physics simulation, Tsunami wave propagation, Coastal flooding visualization, Affected cities analysis, Global coverage with real data, Educational geophysics tool

**In-app purchases:** none


## Frequently asked questions

### Is iSeismometer free?

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

### Is Terramoto free?

Terramoto costs $2.99, with no in-app purchases.

### Which has better reviews, iSeismometer or Terramoto?

iSeismometer is rated higher. iSeismometer averages 3.6 out of 5 from 172 ratings, while Terramoto averages 2.0 from 1 ratings.

### Do iSeismometer or Terramoto have ads?

Neither iSeismometer nor Terramoto shows ads.

### Which is updated more often, iSeismometer or Terramoto?

iSeismometer ships an update every 7 months, and Terramoto every 4 months. Most recently, iSeismometer was updated on October 23, 2026 and Terramoto on October 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.*