# iSeismometer vs iJishin

The clearest difference is rating: iSeismometer at 3.6 against iJishin's 1.0. iSeismometer also leads on ratings volume (170 vs 1). iJishin's advantage is update cadence (every 3 months vs every 7 months). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iSeismometer holds the better App Store score, 3.6 against 1.0. That said, the two scores are not equally well evidenced: iSeismometer has 170 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 76% of iSeismometer's written reviews are positive against 70% of iJishin's.

iSeismometer ships an update every 7 months, iJishin every 3 months. The most recent releases landed on September 17, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | iSeismometer | iJishin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (170 ratings)](https://appshunter.io/ios/app/iseismometer/id304190739/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/ijishin/id386745649/reviews) |
| Number of ratings | **170** | 1 |
| Positive reviews | **76.4% of reviews** | 70.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 3 MB | 21 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ObjectGraph LLC](https://appshunter.io/developer/284700705) | [Hakusan Corporation](https://appshunter.io/developer/386745652) |

## 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


### iJishin

[App page](https://appshunter.io/ios/app/ijishin/id386745649)

This application transforms your iPhone into a seismometer, allowing you to measure and analyze seismic vibrations. You can upload your observations to share with the public and utilize various tools for wave analysis, including graphical displays of power spectrum and displacement.

**Highlights:** Transforms iPhone into a seismometer, Measures seismic vibrations, Analyzes wave data, Uploads seismic observations, Graphical display of power spectrum, Measures velocity and displacement

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is iSeismometer free?

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

### Is iJishin free?

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

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

iSeismometer is rated higher. iSeismometer averages 3.6 out of 5 from 170 ratings, while iJishin averages 1.0 from 1 ratings.

### Do iSeismometer or iJishin have ads?

Neither iSeismometer nor iJishin shows ads.

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

iSeismometer ships an update every 7 months, and iJishin every 3 months. Most recently, iSeismometer was updated on September 17, 2026 and iJishin on September 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.*