# E2M (Engineer with EM waves) vs Emergency Action Plan

E2M (Engineer with EM waves) and Emergency Action Plan are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. E2M (Engineer with EM waves) sells 3 in-app purchases, starting at $7.99 per month and Emergency Action Plan sells 4 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

E2M (Engineer with EM waves) ships an update fortnightly, Emergency Action Plan every 11 days. The most recent releases landed on October 7, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | E2M (Engineer with EM waves) | Emergency Action Plan |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 11 days** |
| Monetization | Freemium | — |
| Size | 80 MB | 9 MB |
| Requires iOS | 17.6 | **17** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ComPhysics](https://appshunter.io/developer/1821978540) | [DZMITRY ADZIARYKHA](https://appshunter.io/developer/1840716468) |

## 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 |


### Emergency Action Plan

[App page](https://appshunter.io/ios/app/emergency-action-plan-sheltr/id6760353585)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Version | $2.99 | per 7 days |
| Limited Offer | $14.99 | per year |
| Premium Version | $29.99 | per year |
| Lifetime Access | $39.99 | one-time |


## 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 Emergency Action Plan free?

Emergency Action Plan is free to download, with in-app purchases available.

### Do E2M (Engineer with EM waves) or Emergency Action Plan have ads?

Neither E2M (Engineer with EM waves) nor Emergency Action Plan shows ads.

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

E2M (Engineer with EM waves) ships an update fortnightly, and Emergency Action Plan every 11 days. Most recently, E2M (Engineer with EM waves) was updated on October 7, 2026 and Emergency Action Plan on October 15, 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.*