# iSeismometer vs Stratostar

The clearest difference is rating: Stratostar at 5.0 against iSeismometer's 3.6. iSeismometer's advantage is ratings volume (170 vs 1). On price, update cadence, 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.

Stratostar holds the better App Store score, 5.0 against 3.6. 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.

iSeismometer ships an update every 7 months, Stratostar every 10 months. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | iSeismometer | Stratostar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (170 ratings)](https://appshunter.io/ios/app/iseismometer/id304190739/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stratostar/id1086485669/reviews)** |
| Number of ratings | **170** | 1 |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 7 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 3 MB | 8 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ObjectGraph LLC](https://appshunter.io/developer/284700705) | [AJ Technologies LLC](https://appshunter.io/developer/979376774) |

## 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


### Stratostar

[App page](https://appshunter.io/ios/app/stratostar/id1086485669)

Monitor and communicate with StratoStar electronics on the ground before a launch. Connect via Wi-Fi to display sensor data from the SatCom Flight Computer. Designed for use in close proximity to the device.

**Highlights:** Ground monitoring, Communication with electronics, Wi-Fi connectivity, Sensor data display, Compatible with SatCom Flight Computer

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iSeismometer free?

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

### Is Stratostar free?

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

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

Stratostar is rated higher. iSeismometer averages 3.6 out of 5 from 170 ratings, while Stratostar averages 5.0 from 1 ratings.

### Do iSeismometer or Stratostar have ads?

Neither iSeismometer nor Stratostar shows ads.

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

iSeismometer ships an update every 7 months, and Stratostar every 10 months. Most recently, iSeismometer was updated on October 17, 2026 and Stratostar on October 13, 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.*