Comparison

VHDL Compiler vs Simplex

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

Head to head
About

VHDL Compiler

Write and test VHDL code on your mobile device. This application is designed for learning and executing VHDL snippets using the GHDL simulator. It offers a code editor with syntax highlighting and a custom keyboard for efficient input.

Highlights
  • Compile and run VHDL programs
  • View program output and errors
  • Custom keyboard for VHDL characters
  • Advanced source code editor
  • Syntax highlighting and line numbers
  • Import, open, save, and share files
Features
Read full description

Write VHDL code directly on your iPhone, iPad and iPod Touch! This app is ideal for learning and testing code snippets! VHDL (VHSIC Hardware Description Language) is a hardware description language used in electronic design automation to describe digital and mixed-signal systems such as field-programmable gate arrays and integrated circuits. VHDL can also be used as a general purpose parallel programming language. This app uses the open-source GHDL simulator (http://ghdl.free.fr). GHDL is a VHDL compiler that can execute (nearly) any VHDL program. GHDL is not a synthesis tool: you cannot create a netlist with GHDL (yet). Features: - Compile and run your program - View program output or detailed error - Custom keyboard for easy input of frequently used characters - Optimized for connecting with external physical/bluetooth keyboard - Advanced source code editor with syntax highlighting and line numbers - Open, save, import and share VHDL files. Limitations: - Internet connection is required for compilation - Maximum program running time is 20s - One file can be run at a time - All entities should be have the same name as their files.

About

Simplex

Features
Read full description

Do you spend hours solving algebraic matrices by hand, only to have a single sign error ruin your entire Linear Optimization exercise? Understanding the Simplex Algorithm in Operations Research can be frustrating. Current tools are clunky, confusing, and seem like they're from the 90s. DISCOVER SIMPLEX EDUCATIONAL The high-fidelity academic tool designed exclusively for iOS and iPadOS that transforms complex matrices into a fluid, readable, and intuitive visual experience. Perfect for students of Industrial Engineering, Economics, Business Administration, and optimization professionals. WHAT YOU CAN DO: • Dynamic Model Builder: Switch between Maximization (Max Z) and Minimization (Min Z). Enter constraints with operators (≤, ≥, =). • Intelligent Engine: Automatic conversion to Standard Form (injecting slack, surplus, and artificial variables). • Special Case Detection: Identifies unique, multiple (infinite), unbounded, or infeasible solutions without infinite loops. • Local History with SwiftData: Audit your past problems instantly, without re-entering large matrices. CHOOSE HOW TO LEARN: 1. FINAL RESULT MODE (Free): Your executive success card. Visualize the optimal vertex with specific color codes (Green for unique solution, Purple for multiple). 2. STEP-BY-STEP MODE: An interactive learning log that details each iteration and pivot in ultra-readable, single-spaced tables. Access it for free through rewarded ads or unlock it forever. PRO PASS (One-Time Payment - No Subscriptions): Completely remove ads, unlock unlimited offline Step-by-Step Guides, and export your completed exercises as LaTeX code or professional PDFs. Designed following Apple's guidelines to offer you a clean, dark, and fast interface. Pass your course without frustration!

Screenshots

VHDL Compiler4 screens
Simplex4 screens

Verdict

The call

The clearest difference is iOS requirement: VHDL Compiler at 12.0 against Simplex's 26.0. On price, ads, in-app purchases and device support 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. VHDL Compiler sells 1 one-off in-app purchase and Simplex sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Scorecard1 real difference · 9 level
VHDL Compiler versus Simplex: the parameters behind the verdict, then further details
ParameterVHDL CompilerSimplex
PriceFreeFree
Rating2.7 (7 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings7 — better—
Update frequencyEvery 2 months—
AdsYesYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better26.0
Further details — not scored
Size20 MB5 MB
Age rating4+4+
DeveloperKetan AppaFernando Castillo

In-app purchases

1 purchases

VHDL Compiler

One-time1
  • Upgrade$2.99
1 purchases

Simplex

One-time1
  • Simplex Premium$1.99

Questions

Is VHDL Compiler free?
VHDL Compiler is free to download, with in-app purchases available.
Is Simplex free?
Simplex is free to download, with in-app purchases available.
Do VHDL Compiler or Simplex have ads?
Both VHDL Compiler and Simplex show ads.

Other comparisons