Comparison

E2M (Engineer with EM waves) vs Subscription Manager

Price, ratings, monetisation and update history for both apps, side by side β€” 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 (ΞΌm), 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

Subscription Manager

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
Read full description

Stop surprise renewals. See where your money goes. Most people underestimate their subscription spend and forget at least one renewal each year. Nexpend shows all subscriptions in one place, what's due next and what the next 12 months will cost, with smart reminders and multi-currency support β€” so you never miss a payment or pay for things you don't use. How Nexpend helps you save money? - Never miss a payment β€” smart reminders before each bill or renewals. - No surprise renewals β€” day-by-day payment calendar. - See where your money goes β€” this month's and year's total costs, due next, active subscriptions. - Multi-currency made simple β€” add in any currency, auto-converts to yours. - Stay organized β€” tags, payment methods, notes, active/paused states. - Find anything fast β€” search, sort, and filter your subscriptions. - Plan ahead β€” 12-month cost forecast by month. - Your data, your choice β€” on-device storage, data export and optional iCloud backup. Nexpend makes subscription management simple, clear, and under control β€” so you keep what matters and stop paying for what doesn’t. What's in Nexpend Plus? Nexpend Plus unlocks unlimited tracking, early renewal reminders, automatic multi-currency conversion, full insights & 12-month forecast, CSV export & iCloud backup, and priority features β€” one-time purchase, no subscription. β€” Privacy Policy https://nexpend.com/#privacy β€” Terms Of Service https://nexpend.com/#terms β€” EULA https://nexpend.com/#eula

Screenshots

E2M (Engineer with EM waves)4 screens
Subscription Manager4 screens

Verdict

The call

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.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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.

UpkeepUpdate frequency

E2M (Engineer with EM waves) ships an update fortnightly, Subscription Manager every 4 months. The most recent releases landed on September 19, 2026 and October 12, 2026 respectively.

Scorecard1 real difference Β· 7 level
E2M (Engineer with EM waves) versus Subscription Manager: the parameters behind the verdict, then further details
ParameterE2M (Engineer with EM waves)Subscription Manager
PriceFreeFree
Positive reviews100.0% of reviews100.0% of reviews
Update frequencyFortnightly β€” betterEvery 4 months
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad β€” betteriPhone
Requires iOS17.617.0 β€” better
Further details β€” not scored
Size80 MB40 MB
Age rating4+12+
DeveloperComPhysicsOverflow LTD

Customer experience

E2M (Engineer with EM waves)

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

Subscription Manager

Written reviews1 reviews
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
5 purchases

Subscription Manager

Subscriptions3
  • Weekly$4.997 Days
  • Monthly$9.991 Month
  • Yearly$29.991 Year
One-time2
  • Lifetime$9.99
  • Lifetime$29.99

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 September 19, 2026 and Subscription Manager on October 12, 2026.

Other comparisons