Comparison

E2M (Engineer with EM waves) vs Cyber21

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

E2M (Engineer with EM waves)

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
Read full description

Engineer with EM waves (E2M) is a powerful and fast 1D electromagnetic solver designed for engineers, researchers, and students. Analyze complex layered structures, extract photonic bands, and simulate optical properties directly on your iOS device. Key Features: - Advanced 1D EM Solver: Simulate 1D stacked (layered) structures with high-speed performance. - Comprehensive Analysis: Calculate Reflectance, Transmittance, and Absorptance (RTA) as functions of incident angle, thickness, and frequency. - Polarization Control: Analyze arbitrary polarization states. Define complex TE and TM inputs to simulate Linear, Circular, or Elliptical polarization interactions. - Photonic Band Structures: Extract band structures for both TE and TM modes to analyze periodic systems. - Material Library: 1. Built-in integration with the refractiveindex.info database for immediate access to practical material parameters (converts complex refractive index to complex permittivity/permeability assuming non-magnetic media). 2. User-Defined Materials: Create custom materials, including general LHI (Linear, Homogeneous, Isotropic) and Metamaterials (Double Negative/DNG). - Flexible Domain Settings: Switch simulation parameters between Frequency (THz), Wavelength (μm), or Energy (eV). - Data Export: Easily export raw data (.csv) and figures via Email or the iOS Files app for post-processing. Freeware Mode: E2M offers a generous free mode allowing designs of up to 3 layers. It supports infinite periodic repetition of these layers, enabling a wide range of academic calculations and case studies without a subscription. In-App Subscriptions: Unlock the full potential of E2M to design structures with unlimited layers. - Options: One Month, One Year, Lifetime. - Benefit: Removes the 3-layer limitation during the subscription period. - Terms: Subscriptions (excluding Lifetime) automatically renew unless canceled at least 24 hours before the end of the current period. You can manage or cancel your subscription anytime in your Apple Account settings. Legal - Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ - Privacy Policy: https://comphysics.com/index.php/privacy-policy-2/

About

Cyber21

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
Read full description

Cyber21 is a personal cybersecurity and privacy protection platform designed to help you understand and reduce your digital risk. Features: • Threat Score Dashboard • Data Breach Monitoring • Dark Web Exposure Detection • Privacy Risk Analysis • Network Security Checks • AI-Powered Security Assistant • Identity Protection Tools • Security Reports and Recommendations • Spam Call Protection • Exposure Timeline Tracking • Real-Time Security Alerts Cyber21 helps users identify potential security risks, understand exposure indicators, and take recommended actions to improve digital safety. Important: Cyber21 provides security insights and risk indicators. It does not guarantee prevention of all threats, attacks, scams, or unauthorized access. Subscription: Some advanced features require a Cyber21 Pro subscription. Subscription renews automatically unless canceled through Apple ID settings. Privacy First: Cyber21 is designed to minimize data collection and protect user privacy. cybersecurity,privacy,dark web,data breach,identity protection,security,cyber,spam blocker,privacy scan,threat monitoring. http://cyber21ai.com/privacy https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

E2M (Engineer with EM waves)4 screens
Cyber214 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard1 real difference · 9 level
E2M (Engineer with EM waves) versus Cyber21: the parameters behind the verdict, then further details
ParameterE2M (Engineer with EM waves)Cyber21
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings—2 — better
Update frequencyFortnightly — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPad — betteriPhone
Requires iOS17.616.0 — better
Further details — not scored
Size80 MB45 MB
Age rating4+4+
DeveloperComPhysicsnile dynamics llc

Customer experience

E2M (Engineer with EM waves)

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Cyber21

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

E2M (Engineer with EM waves)

Subscriptions2
  • Standard: 1 month subscription7 Days trial$7.991 Month
  • Standard: 1 year subscription7 Days trial$79.991 Year
One-time1
  • E2M Lifetime License$239.99
1 purchases

Cyber21

Subscriptions1
  • cyber21 pro$7.991 Month

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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