# E2M (Engineer with EM waves) vs Carpet Area Calculator

The clearest difference is in-app purchases: Carpet Area Calculator at none against E2M (Engineer with EM waves)'s 3. Carpet Area Calculator also leads on iOS requirement (15.1 vs 17.6). E2M (Engineer with EM waves)'s advantage is ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. E2M (Engineer with EM waves) sells 3 in-app purchases, starting at $7.99 per month. Carpet Area Calculator asks for nothing beyond the download.

E2M (Engineer with EM waves) ships an update fortnightly, Carpet Area Calculator every 2 weeks. Both last shipped on October 28, 2026.

## The numbers

| Metric | E2M (Engineer with EM waves) | Carpet Area Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Freemium | — |
| Size | 80 MB | 34 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ComPhysics](https://appshunter.io/developer/1821978540) | [Rajasekar Rajendran](https://appshunter.io/developer/1881299016) |

## What reviewers say

### E2M (Engineer with EM waves)

[App page](https://appshunter.io/ios/app/e2m-engineer-with-em-waves/id6747601796)

This app is a 1D electromagnetic and optics simulator for iOS devices. It allows engineers, researchers, and students to analyze layered structures, extract photonic bands, and simulate optical properties with advanced polarization control and material libraries.

**Highlights:** 1D EM solver for layered structures, Reflectance, Transmittance, Absorptance analysis, Arbitrary polarization state analysis, Photonic band structure extraction, Integrated material library (refractiveindex.info), User-defined materials, Data export (.csv, figures)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard: 1 month subscription | $7.99 | per month |
| Standard: 1 year subscription | $79.99 | per year |
| E2M Lifetime License | $239.99 | one-time |


### Carpet Area Calculator

[App page](https://appshunter.io/ios/app/carpet-area-calculator/id6764365891)

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

**In-app purchases:** none


## Frequently asked questions

### Is E2M (Engineer with EM waves) free?

E2M (Engineer with EM waves) is free to download, with in-app purchases available.

### Is Carpet Area Calculator free?

Carpet Area Calculator is free to download, with no in-app purchases.

### Do E2M (Engineer with EM waves) or Carpet Area Calculator have ads?

Carpet Area Calculator shows ads; E2M (Engineer with EM waves) does not.

### Which is updated more often, E2M (Engineer with EM waves) or Carpet Area Calculator?

E2M (Engineer with EM waves) ships an update fortnightly, and Carpet Area Calculator every 2 weeks. Most recently, E2M (Engineer with EM waves) was updated on October 28, 2026 and Carpet Area Calculator on October 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*