# Car Mid vs E2M (Engineer with EM waves)

The clearest difference is in-app purchases: Car Mid at none against E2M (Engineer with EM waves)'s 3. Car Mid also leads on iOS requirement (12 vs 17.6). On price, update cadence, ads 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. Car Mid asks for nothing beyond the download.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Car Mid | E2M (Engineer with EM waves) |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Monetization | — | Freemium |
| Size | 19 MB | 80 MB |
| Requires iOS | **12** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Huizhou Dongrong Haotian Electronic Technology Co., Ltd.](https://appshunter.io/developer/1584059390) | [ComPhysics](https://appshunter.io/developer/1821978540) |

## What reviewers say

### Car Mid

[App page](https://appshunter.io/ios/app/car-mid/id6745722617)

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

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Car Mid free?

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

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

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

### Do Car Mid or E2M (Engineer with EM waves) have ads?

Neither Car Mid nor E2M (Engineer with EM waves) shows ads.

### Which is updated more often, Car Mid or E2M (Engineer with EM waves)?

Car Mid ships an update fortnightly, and E2M (Engineer with EM waves) fortnightly. Most recently, Car Mid was updated on October 5, 2026 and E2M (Engineer with EM waves) on October 7, 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.*