Comparison

Car Mid vs E2M (Engineer with EM waves)

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

Head to head
About

Car Mid

Features
Read full description

Bluetooth Upgrade Car Mid Product

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 (ฮผm), 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/

Screenshots

Car Mid3 screens
E2M (Engineer with EM waves)4 screens

Verdict

The call

The clearest difference is in-app purchases: Car Mid at none against E2M (Engineer with EM waves)'s 3. Car Mid also leads on iOS requirement (12 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. E2M (Engineer with EM waves) sells 3 in-app purchases, starting at $7.99 per month. Car Mid asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

Scorecard2 real differences ยท 6 level
Car Mid versus E2M (Engineer with EM waves): the parameters behind the verdict, then further details
ParameterCar MidE2M (Engineer with EM waves)
PriceFreeFree
Positive reviewsโ€”100.0% of reviews
Update frequencyFortnightlyFortnightly
AdsNoNo
In-app purchasesNo โ€” betterYes
Monetizationโ€”Freemium
DevicesiPhone, iPad, iPod โ€” betteriPhone, iPad
Requires iOS12 โ€” better17.6
Further details โ€” not scored
Size19 MB80 MB
Age rating4+4+
DeveloperHuizhou Dongrong Haotian Electronic Technology Co., Ltd.ComPhysics

In-app purchases

None

Car Mid

No 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

Questions

Is Car Mid free?
Car Mid 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 Car Mid or E2M (Engineer with EM waves) have ads?
Neither Car Mid nor E2M (Engineer with EM waves) shows ads.
Which is updated more often, Car Mid or E2M (Engineer with EM waves)?
Car Mid ships an update fortnightly, and E2M (Engineer with EM waves) fortnightly. Most recently, Car Mid was updated on October 5, 2026 and E2M (Engineer with EM waves) on October 7, 2026.

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