# E2M (Engineer with EM waves) vs Subscription Manager

The clearest difference is update cadence: E2M (Engineer with EM waves) at fortnightly against Subscription Manager's every 4 months. On price, review sentiment, ads and in-app purchases 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 Subscription Manager sells 5 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

E2M (Engineer with EM waves) ships an update fortnightly, Subscription Manager every 4 months. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | E2M (Engineer with EM waves) | Subscription Manager |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | Freemium | Free with in-app purchases |
| Size | 80 MB | 40 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [ComPhysics](https://appshunter.io/developer/1821978540) | [Overflow LTD](https://appshunter.io/developer/1664238457) |

## 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 |


### Subscription Manager

[App page](https://appshunter.io/ios/app/subscription-manager-nexpend/id6752123162)

Track all your recurring expenses in one place. Get smart reminders for upcoming payments and see your total subscription costs for the month and year ahead. Manage subscriptions with tags, payment methods, and notes for better financial control.

**Highlights:** Track all subscriptions, Smart payment reminders, 12-month cost forecast, Multi-currency support, On-device data storage, Data export

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| Monthly | $9.99 | per month |
| Yearly | $29.99 | per year |
| Lifetime | $9.99 | one-time |
| Lifetime | $29.99 | 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 Subscription Manager free?

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

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

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

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

E2M (Engineer with EM waves) ships an update fortnightly, and Subscription Manager every 4 months. Most recently, E2M (Engineer with EM waves) was updated on October 7, 2026 and Subscription Manager on October 12, 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.*