# E2M (Engineer with EM waves) vs CreateCoolGIFs

The clearest difference is in-app purchases: CreateCoolGIFs at none against E2M (Engineer with EM waves)'s 3. CreateCoolGIFs also leads on iOS requirement (13.0 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. CreateCoolGIFs asks for nothing beyond the download.

E2M (Engineer with EM waves) ships an update fortnightly, CreateCoolGIFs every 2 weeks. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | E2M (Engineer with EM waves) | CreateCoolGIFs |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Freemium | — |
| Size | 80 MB | 12 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [ComPhysics](https://appshunter.io/developer/1821978540) | [zhengqian Tang](https://appshunter.io/developer/1661753537) |

## 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 |


### CreateCoolGIFs

[App page](https://appshunter.io/ios/app/createcoolgifs/id6757975492)

**Features:** macOS Compatibility

**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 CreateCoolGIFs free?

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

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

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

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

E2M (Engineer with EM waves) ships an update fortnightly, and CreateCoolGIFs every 2 weeks. Most recently, E2M (Engineer with EM waves) was updated on October 7, 2026 and CreateCoolGIFs on October 1, 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.*