# iSeismometer vs Geology Toolkit

The clearest difference is review sentiment: iSeismometer at 76% against Geology Toolkit's 33%. iSeismometer also leads on in-app purchases (none vs 2) and ratings volume (172 vs 28). Geology Toolkit's advantage is rating (4.6 vs 3.6) and update cadence (every 2 weeks vs every 7 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Geology Toolkit sells 2 in-app purchases, starting at $2.99 per 7 days. iSeismometer asks for nothing beyond the download.

Geology Toolkit holds the better App Store score, 4.6 against 3.6. That said, the two scores are not equally well evidenced: iSeismometer has 172 ratings behind it against 28, so its average is the more settled of the two. Written reviews complicate that: 76% of iSeismometer's written reviews are positive against 33% of Geology Toolkit's, so the app with the better star average is not the one people write more warmly about.

iSeismometer ships an update every 7 months, Geology Toolkit every 2 weeks. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | iSeismometer | Geology Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (172 ratings)](https://appshunter.io/ios/app/iseismometer/id304190739/reviews) | **[4.6 (28 ratings)](https://appshunter.io/ios/app/geology-toolkit-field-guide/id6745966254/reviews)** |
| Number of ratings | **172** | 28 |
| Positive reviews | **76.5% of reviews** | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 87 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ObjectGraph LLC](https://appshunter.io/developer/284700705) | [Laurence Wayne](https://appshunter.io/developer/1739552943) |

## 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


### Geology Toolkit

[App page](https://appshunter.io/ios/app/geology-toolkit-field-guide/id6745966254)

Identify rocks, minerals, and crystals using your camera. Get detailed formation histories, geological data, and create labeled sketches. Build a personal field guide of your finds.

**Highlights:** Identify rocks, minerals, crystals, gems, and pebbles from photos, Detailed formation histories and geological data, Generate labeled pencil field sketches, Save specimens to a personal field guide, Daily Rock of the Day and quizzes, Explore geological layers of famous locations

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $2.99 | per 7 days |
| Geology AI Yearly Subscription | $24.99 | per year |


## Frequently asked questions

### Is iSeismometer free?

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

### Is Geology Toolkit free?

Geology Toolkit is free to download, with in-app purchases available.

### Which has better reviews, iSeismometer or Geology Toolkit?

Geology Toolkit is rated higher. iSeismometer averages 3.6 out of 5 from 172 ratings, while Geology Toolkit averages 4.6 from 28 ratings.

### Do iSeismometer or Geology Toolkit have ads?

Neither iSeismometer nor Geology Toolkit shows ads.

### Which is updated more often, iSeismometer or Geology Toolkit?

iSeismometer ships an update every 7 months, and Geology Toolkit every 2 weeks. Most recently, iSeismometer was updated on October 23, 2026 and Geology Toolkit on October 30, 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.*