# E2M (Engineer with EM waves) vs Cyber21

The clearest difference is update cadence: E2M (Engineer with EM waves) at fortnightly against Cyber21's every 5 weeks. On price, ads, in-app purchases and monetization model 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 and Cyber21 sells 1 in-app purchase, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

E2M (Engineer with EM waves) ships an update fortnightly, Cyber21 every 5 weeks. The most recent releases landed on October 7, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | E2M (Engineer with EM waves) | Cyber21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/cyber21/id6772867234/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | Freemium | Freemium |
| Size | 80 MB | 45 MB |
| Requires iOS | 17.6 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ComPhysics](https://appshunter.io/developer/1821978540) | [nile dynamics llc](https://appshunter.io/developer/1873838089) |

## 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 |


### Cyber21

[App page](https://appshunter.io/ios/app/cyber21/id6772867234)

This platform helps you understand and reduce your digital risk with AI-powered insights. It monitors for data breaches, dark web exposure, and privacy risks, offering actionable recommendations for improved digital safety.

**Highlights:** Threat Score Dashboard, Data Breach Monitoring, Dark Web Exposure Detection, Privacy Risk Analysis, AI-Powered Security Assistant, Identity Protection Tools, Real-Time Security Alerts

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| cyber21 pro | $7.99 | per month |


## 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 Cyber21 free?

Cyber21 is free to download, with in-app purchases available.

### Do E2M (Engineer with EM waves) or Cyber21 have ads?

Neither E2M (Engineer with EM waves) nor Cyber21 shows ads.

### Which is updated more often, E2M (Engineer with EM waves) or Cyber21?

E2M (Engineer with EM waves) ships an update fortnightly, and Cyber21 every 5 weeks. Most recently, E2M (Engineer with EM waves) was updated on October 7, 2026 and Cyber21 on October 20, 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.*