Comparison

Simplex Nodal vs Calculus

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

Head to head
About

Simplex Nodal

Explore electricity markets by building and solving your own models. This app visually demonstrates complex concepts like locational marginal pricing, line losses, and the simplex algorithm. Learn through interactive examples and detailed step-by-step operations.

Highlights
  • Build and solve electricity market models
  • Visualize simplex algorithm workings
  • Explore locational marginal pricing
  • Understand line losses and binding constraints
  • Step-by-step simplex iteration details
  • Export simplex tableaux as CSV
  • Includes sample market models
Read full description

In conjunction with the tutorial document, available at www.simplexnodal.com, use the app to learn about electricity markets by graphically building and solving your own electricity market models. The tutorial also describes the simplex algorithm that solves the model and the app lets you see the internal workings of the algorithm. Demonstrates nodal electricity markets features such as: locational marginal pricing, line losses, parallel flows, binding constraints, price separation, the spring washer effect, negative prices, risk and reserves, ramp-rates, congestion charges, transmission rentals, multiple electrical islands, HVDC branches, HVDC risk, HVDC risk subtractor, HVDC reserve sharing, and more. See www.simplexnodal.com for more screenshots and the tutorial document. Highlights: • The tutorial explains nodal electricity markets and the simplex algorithm via worked examples using the app • Start with small models to learn the basic concepts of the electricity market model the simplex algorithm • Learn how to explain prices by relaxing constraints to determine shadow prices • Enable/disable electricity market features to focus on individual effects, e.g., risk and reserve is easier to explain with line losses disabled • View full details of the simplex modelling including basic and non-basic variables, constraints, shadow prices, and details of the simplex iterations • Learn how the simplex algorithm works by viewing the step by step simplex operations that solve the electricity market model. View iteration details in the app and/or export the simplex tableaux as a csv file • The app implements its own simplex algorithm but you can also export the model in GAMS format to solve externally if you have access to the GAMS solver • Includes sample models that represent sections of an actual electricity market iPhone and iPad functionality is the same. Zoom and scroll allow the iPhone to access iPad sized models.

About

Calculus

This AI-powered math companion provides instant, step-by-step solutions to calculus problems. Easily input questions via photo or typing to understand derivatives, integrals, and limits.

Highlights
  • Photo solver for instant problem capture
  • Manual input for equation entry
  • Detailed step-by-step explanations
  • Instant and accurate solutions
  • Covers derivatives, integrals, limits, and more
Features
Read full description

Master calculus effortlessly with Calculus AI, your intelligent math companion designed to solve complex problems in seconds. Whether you’re working on derivatives, integrals, or limits, this AI-powered tool provides instant, step-by-step explanations to help you learn faster and study smarter. Snap a photo or type your question — Calculus AI transforms any calculus problem into a clear, detailed solution. Key Features Photo Solver: Capture any calculus problem with your camera and get instant results. Manual Input: Type equations directly for fast, accurate solutions. Step-by-Step Explanations: Understand every step with detailed breakdowns. Instant Answers: Get reliable, precise solutions in seconds. Comprehensive Coverage: Supports all major calculus topics, including: - Derivatives & Integration - Limits & Continuity - Differential Equations - Series & Sequences - Multivariable Calculus Perfect For - Students mastering calculus - Homework and assignment help - Exam and test preparation - Self-study and concept review Subscription Options: Pro Weekly – $4.99 per week (auto-renews every week) Pro Yearly – $29.99 per year (auto-renews every year) Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Payment will be charged to your Apple ID account at confirmation of purchase. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and turn off auto-renewal in your Apple ID account settings. Any unused portion of a free trial period will be forfeited when purchasing a subscription. Conquer Geometry Today Download Geometry Scanner and solve any geometry problem with visual clarity and step-by-step guidance. Terms of Use: https://sites.google.com/view/alicsystems/general/term-of-use?authuser=0 Privacy Policy: https://sites.google.com/view/alicsystems/general/privacy-policy?authuser=0 Support: https://sites.google.com/view/alicsystems/general/support?authuser=0

Screenshots

Simplex Nodal4 screens
Calculus3 screens

Verdict

The call

The clearest difference is review sentiment: Simplex Nodal at 100% against Calculus's 0%. Simplex Nodal also leads on in-app purchases (none vs 2) and device support (4 vs 2). Calculus's advantage is update cadence (every 2 weeks vs every 4 months). On price and ads 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. Calculus sells 2 in-app purchases, starting at $4.99 per 7 days. Simplex Nodal asks for nothing beyond the download.

UpkeepUpdate frequency

Simplex Nodal ships an update every 4 months, Calculus every 2 weeks. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

Scorecard6 real differences · 4 level
Simplex Nodal versus Calculus: the parameters behind the verdict, then further details
ParameterSimplex NodalCalculus
PriceFreeFree
Rating—2.0 (4 ratings) — better
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings—4 — better
Update frequencyEvery 4 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPod
Requires iOS9.0 — better15.1
Further details — not scored
Size14 MB36 MB
Age rating4+4+
DeveloperSimplex Nodal LimitedAlicSystems

Customer experience

Simplex Nodal

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

Calculus

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Simplex Nodal

No in-app purchases

2 purchases

Calculus

Subscriptions2
  • Pro Weekly3 Days trial$4.997 Days
  • Pro Yearly$19.991 Year

Questions

Is Simplex Nodal free?
Simplex Nodal is free to download, with no in-app purchases.
Is Calculus free?
Calculus is free to download, with in-app purchases available.
Do Simplex Nodal or Calculus have ads?
Neither Simplex Nodal nor Calculus shows ads.
Which is updated more often, Simplex Nodal or Calculus?
Simplex Nodal ships an update every 4 months, and Calculus every 2 weeks. Most recently, Simplex Nodal was updated on November 1, 2026 and Calculus on October 24, 2026.

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