# PopMath Lite vs iSeismometer

The clearest difference is rating: PopMath Lite at 5.0 against iSeismometer's 3.6. PopMath Lite also leads on iOS requirement (8.0 vs 16.0). iSeismometer's advantage is ratings volume (170 vs 5) and review sentiment (76% vs 67%). 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.

PopMath Lite 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 5, so its average is the more settled of the two. Written reviews complicate that: 67% of PopMath Lite's written reviews are positive against 76% of iSeismometer's, so the app with the better star average is not the one people write more warmly about.

PopMath Lite ships an update every 8 months, iSeismometer every 7 months. The most recent releases landed on September 21, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | PopMath Lite | iSeismometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/popmath-lite/id303258911/reviews)** | [3.6 (170 ratings)](https://appshunter.io/ios/app/iseismometer/id304190739/reviews) |
| Number of ratings | 5 | **170** |
| Positive reviews | 66.7% of reviews | **76.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 7 months** |
| Monetization | Free | Free |
| Size | 8 MB | 3 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [AppBlit LLC](https://appshunter.io/developer/295536769) | [ObjectGraph LLC](https://appshunter.io/developer/284700705) |

## What reviewers say

### PopMath Lite

[App page](https://appshunter.io/ios/app/popmath-lite/id303258911)

This educational game helps children practice basic arithmetic operations by popping matching bubbles. It offers a fun and engaging way to reinforce addition, subtraction, multiplication, and division skills with increasing difficulty.

**Highlights:** Addition, subtraction, multiplication, division practice, Bubble popping gameplay, Increasing number difficulty, Operator-specific practice, Performance feedback, Personalized messages

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is PopMath Lite free?

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

### Is iSeismometer free?

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

### Which has better reviews, PopMath Lite or iSeismometer?

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

### Do PopMath Lite or iSeismometer have ads?

Neither PopMath Lite nor iSeismometer shows ads.

### Which is updated more often, PopMath Lite or iSeismometer?

PopMath Lite ships an update every 8 months, and iSeismometer every 7 months. Most recently, PopMath Lite was updated on September 21, 2026 and iSeismometer on September 17, 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.*