# iSeismometer vs Planedex

The clearest difference is rating: Planedex at 5.0 against iSeismometer's 3.6. Planedex also leads on update cadence (every 2 weeks vs every 7 months) and review sentiment (100% vs 76%). iSeismometer's advantage is in-app purchases (none vs 2) and ratings volume (172 vs 6). On price, ads, device support and iOS requirement there is nothing between them.

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

Planedex holds the better App Store score, 5.0 against 3.6. That said, the two scores are not equally well evidenced: iSeismometer has 172 ratings behind it against 6, 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 100% of Planedex's.

iSeismometer ships an update every 7 months, Planedex every 2 weeks. Both last shipped on October 31, 2026.

## The numbers

| Metric | iSeismometer | Planedex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (172 ratings)](https://appshunter.io/ios/app/iseismometer/id304190739/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/planedex-plane-spotting/id6793767950/reviews)** |
| Number of ratings | **172** | 6 |
| Positive reviews | 76.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Size | 3 MB | 5 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ObjectGraph LLC](https://appshunter.io/developer/284700705) | [Revvin Schown LLC](https://appshunter.io/developer/6793767952) |

## 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


### Planedex

[App page](https://appshunter.io/ios/app/planedex-plane-spotting/id6793767950)

Discover and collect real aircraft flying overhead with a live radar map and augmented reality camera. Turn plane spotting into a fun game with quizzes, badges, and shareable trading cards. Designed for kids but enjoyable for all ages.

**Highlights:** Live radar map of aircraft, Augmented reality camera identification, Aircraft collection log, Earnable badges and ranks, Plane spotting quiz, Rare plane alerts, Family sharing subscription

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $2.99 | per month |
| Plus Yearly | $19.99 | per year |


## Frequently asked questions

### Is iSeismometer free?

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

### Is Planedex free?

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

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

Planedex is rated higher. iSeismometer averages 3.6 out of 5 from 172 ratings, while Planedex averages 5.0 from 6 ratings.

### Do iSeismometer or Planedex have ads?

Neither iSeismometer nor Planedex shows ads.

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

iSeismometer ships an update every 7 months, and Planedex every 2 weeks. Most recently, iSeismometer was updated on October 31, 2026 and Planedex on October 31, 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.*