# Wavelength Optics Calculator vs E2M (Engineer with EM waves)

The clearest difference is review sentiment: E2M (Engineer with EM waves) at 100% against Wavelength Optics Calculator's 0%. E2M (Engineer with EM waves) also leads on update cadence (fortnightly vs monthly). Wavelength Optics Calculator's advantage is in-app purchases (none vs 3) and iOS requirement (12.0 vs 17.6). On price, 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. Wavelength Optics Calculator asks for nothing beyond the download.

Wavelength Optics Calculator ships an update monthly, E2M (Engineer with EM waves) fortnightly. The most recent releases landed on October 10, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Wavelength Optics Calculator | E2M (Engineer with EM waves) |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | **Free** | Freemium |
| Size | 30 MB | 80 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WAVELENGTH OPTO-ELECTRONIC (S) PTE. LTD.](https://appshunter.io/developer/1573390066) | [ComPhysics](https://appshunter.io/developer/1821978540) |

## What reviewers say

### Wavelength Optics Calculator

[App page](https://appshunter.io/ios/app/wavelength-optics-calculator/id1573390064)

This utility app provides a collection of pre-built calculator formulas for common optical calculations. It's designed for quick and easy access to essential optical engineering tools.

**Highlights:** Pre-built calculator formulas, Popular optical calculations, Quick access tools, Designed for engineers, Useful for students

**Features:** macOS Compatibility

**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 Wavelength Optics Calculator free?

Wavelength Optics Calculator 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 Wavelength Optics Calculator or E2M (Engineer with EM waves) have ads?

Neither Wavelength Optics Calculator nor E2M (Engineer with EM waves) shows ads.

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

Wavelength Optics Calculator ships an update monthly, and E2M (Engineer with EM waves) fortnightly. Most recently, Wavelength Optics Calculator was updated on October 10, 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.*