Comparison

4 vs PID Controller Simulation

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

Head to head
About

4

This utility app converts between 4-20 mA current signals and temperature readings. It's designed for engineers and technicians to quickly check transmitter scaling, verify loop values, and troubleshoot signal issues in various industrial applications.

Highlights
  • Two-way current to temperature conversion
  • Custom min/max process range
  • Support for negative temperatures
  • Celsius and Fahrenheit support
  • Fast and clean interface
Features
Read full description

4-20 Temperature Calculator is a practical tool for engineers, technicians, and field service professionals working with 4-20 mA transmitters. Use it to quickly convert: • 4-20 mA to temperature • Temperature to 4-20 mA The app helps you work faster in the field by giving you a simple and accurate way to check transmitter scaling, verify loop values, and troubleshoot signal readings. Key features: • Two-way conversion between current and temperature • Custom min/max process range • Support for negative temperature ranges • Celsius and Fahrenheit input/output • Fast, clean interface for everyday use • Useful for HVAC, process control, maintenance, and commissioning work Whether you are calibrating a transmitter, checking a loop, or validating process values, 4-20 Temperature Calculator gives you the numbers you need in seconds.

About

PID Controller Simulation

Master PID control theory and practice with this comprehensive simulation platform. Learn fundamental concepts, tune parameters, and simulate real-world applications like temperature and motor speed control. Export PID parameters as production-ready code in multiple languages.

Highlights
  • Comprehensive tutorial system
  • Interactive scenario simulations
  • Performance analysis tools
  • Code generator for multiple languages
  • Real-time curve visualization
  • Advanced PID algorithm explanations
Features
Read full description

PID Controller Assistant - Master the Core of Automatic Control Your comprehensive learning and simulation platform for PID control! Whether you're an engineering student, automation enthusiast, or professional engineer, this app provides everything you need to master PID control theory and practice. Core Features Comprehensive Tutorial System * Structured learning path from basics to advanced topics * Four major categories: Basic Concepts, Parameter Tuning, Scenario Applications, Advanced Techniques * Interactive examples with step-by-step guidance * Difficulty levels: Beginner, Intermediate, Advanced   Interactive Scenario Simulations * Temperature Control: Simulate incubator/oven temperature systems * Motor Speed Control: Practice DC motor speed regulation * Water Level Control: Master tank level maintenance systems * Cruise Control: Experience automotive cruise control systems * Pressure Control: Work with pneumatic/hydraulic control systems * Real-time curve visualization with adjustable parameters * Disturbance testing (door opening, temperature fluctuations, load changes, etc.) Performance Analysis Tools * Real-time performance metrics calculation * Overshoot, rise time, settling time, steady-state error analysis * Intelligent tuning suggestions based on system performance * Visual comparison of different parameter sets * History tracking and comparison features Code Generator * Export PID parameters as production-ready code * Multiple language support: C, C++, Python, Arduino, JavaScript * Copy and share generated code instantly * Perfect for rapid prototyping and deployment Advanced Visualization * Real-time response curve display * Ideal PID response examples * Multi-curve comparison view * Performance metrics charts Learning Content Fundamental Concepts * What is PID control and how it works * Relationships between setpoint, process variable, and control output * Proportional (P), Integral (I), and Derivative (D) components explained * Control system stability basics Real-World Applications * Temperature control systems * Motor speed control * Water level control * Cruise control systems * Pressure control applications Advanced Techniques * Integral windup prevention * Derivative noise filtering * Adaptive PID control * Cascade PID control strategies * Feedforward control optimization Supported PID Algorithms 1. Positional PID Control - Standard position-based control 2. Incremental PID Control - Velocity-based algorithm 3. Integral Separation PID - Prevents integral windup during large errors 4. Anti-Windup PID - Advanced integral saturation handling 5. Variable-Speed Integral PID - Adaptive integral gain 6. PID with Filter - Noise reduction for derivative term 7. Incomplete Derivative PID - Smoother derivative action 8. Derivative Ahead PID - Advanced derivative control 9. PID with Dead Zone - For systems with friction or backlash Why Choose This App?  From Theory to Practice: Seamlessly connect learning with hands-on simulation  Visual Learning: Understand abstract concepts through interactive charts and animations  Production-Ready: Export parameters as code for immediate deployment  Comprehensive: All PID algorithms and techniques in one place  Performance Focused: Real-time metrics help optimize your control systems  Professional Grade: Trusted by students, hobbyists, and engineers worldwide Perfect For * Students: Master PID control for coursework and exams * Engineers: Quick tuning reference and parameter testing * Makers: Arduino and embedded system projects * Educators: Teaching tool with visual demonstrations * Researchers: Algorithm comparison and performance analysis  Get Started Today! Download now and transform the way you learn and apply PID control. Whether you're preparing for exams, working on a project, or optimizing industrial systems, PID Controller Assistant is your essential companion.

Screenshots

43 screens
PID Controller Simulation4 screens

Verdict

The call

The clearest difference is price: 4 at Free against PID Controller Simulation's $3.99. PID Controller Simulation's advantage is update cadence (every 3 months vs every 11 months) and iOS requirement (13.0 vs 15.6). On rating, ratings volume, ads and in-app purchases 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

4 is free to download; PID Controller Simulation costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 3.0 for 4 against 3.0 for PID Controller Simulation. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

UpkeepUpdate frequency

4 ships an update every 11 months, PID Controller Simulation every 3 months. The most recent releases landed on September 29, 2026 and October 9, 2026 respectively.

Scorecard4 real differences · 6 level
4 versus PID Controller Simulation: the parameters behind the verdict, then further details
Parameter4PID Controller Simulation
PriceFree — better$3.99
Rating3.0 (2 ratings)3.0 (2 ratings)
Positive reviews—33.3% of reviews
Number of ratings22
Update frequencyEvery 11 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size30 MB6 MB
Age rating4+4+
DeveloperMantas Kamarauskas立娜 王

Customer experience

4

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%

PID Controller Simulation

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews3 reviews
Positive33.3%
Neutral33.3%
Negative33.3%

In-app purchases

None

4

No in-app purchases

None

PID Controller Simulation

No in-app purchases

Questions

Is 4 free?
4 is free to download, with no in-app purchases.
Is PID Controller Simulation free?
PID Controller Simulation costs $3.99, with no in-app purchases.
Which has better reviews, 4 or PID Controller Simulation?
4 and PID Controller Simulation are both rated 3.0 out of 5 on the App Store, from 2 and 2 ratings respectively.
Do 4 or PID Controller Simulation have ads?
Neither 4 nor PID Controller Simulation shows ads.
Which is updated more often, 4 or PID Controller Simulation?
4 ships an update every 11 months, and PID Controller Simulation every 3 months. Most recently, 4 was updated on September 29, 2026 and PID Controller Simulation on October 9, 2026.

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