🖥️ The Ultimate List of Electronic Circuit Design & Simulation Software (2026 Guide)
Hey makers! Electro here. Whether you are designing a simple LED flasher, a high-power SMPS, or coding an IoT dashboard for your ESP32, simulating your circuit before soldering is the difference between a working prototype and a magic smoke release.
In this guide, I’ve completely overhauled our classic software list for 2026. We are cutting out the outdated tools and focusing on what actually works today: from industry-standard free SPICE engines to modern cloud-based IoT simulators. Let’s dive in!
🔄 Updated for 2026: Added modern IoT simulators (Wokwi), updated ownership info (LTspice/Micro-Cap), and included a quick comparison table.
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📊 Quick Comparison Table
| Software | Best For | Price | Platform |
|---|---|---|---|
| LTspice | Power Electronics, SMPS, Analog | Free | Win, Mac |
| Micro-Cap 12 | Advanced Analog/Digital Analysis | Free (Formerly $4500!) | Windows |
| Wokwi | ESP32, Arduino, Raspberry Pi Pico | Free / Pro | Web Browser |
| KiCad (ngspice) | PCB Design + Basic Simulation | Free / Open Source | Win, Mac, Linux |
| Falstad | Visualizing Current Flow, Education | Free | Web Browser |
| Proteus | MCU Simulation + PCB Layout | Paid | Windows |
🏆 1. The Heavyweights (Free & Industry Standard)
LTspice (by Analog Devices)
Originally from Linear Technology (now Analog Devices), LTspice is arguably the most popular free SPICE simulator in the world. It is heavily optimized for switching regulators and power electronics, making simulations that take hours on other software finish in seconds. It includes a massive library of op-amps, MOSFETs, and power management ICs.
💡 Electro's Tip: If you are designing linear power supplies or audio amplifiers, check out my guide: LTSpice pour apprendre à simuler vos circuits.
Micro-Cap 12 (The Hidden Gem)
Here is the biggest secret in EDA software: Spectrum Software closed its doors in 2019 and released their flagship Micro-Cap 12 (which used to cost over $4,500) as 100% FREE freeware. It features an incredibly intuitive UI, advanced AC/DC/Transient analysis, and a massive component library. If you are on Windows, this is a must-download.
KiCad (with built-in ngspice)
KiCad is the undisputed king of open-source PCB design. In recent versions, it has deeply integrated ngspice, allowing you to simulate your schematics before pushing them to the PCB layout editor. Perfect for keeping your workflow inside a single, free ecosystem.
🤖 2. Best for Makers & IoT (ESP32 / Arduino)
Wokwi (The Modern Maker's Choice)
Standard SPICE simulators cannot simulate microcontroller code. Enter Wokwi. It is a browser-based simulator that lets you wire up an ESP32, Arduino, or Raspberry Pi Pico, write C++/MicroPython code, and simulate the exact behavior (including WiFi, I2C OLEDs, and NeoPixels) in real-time. It is an absolute game-changer for IoT projects.
Tinkercad Circuits
Owned by Autodesk, this web-based tool is fantastic for beginners. It features a 3D breadboard view where you can drag and drop components, write Arduino code, and watch the LEDs blink. Great for teaching and quick logic verification.
Proteus Design Suite
A classic in the engineering world. Proteus allows you to simulate complex microcontrollers (PIC, AVR, ARM) alongside analog components. While it is a paid enterprise tool, its VSM (Virtual System Modelling) feature remains unmatched for debugging firmware on custom hardware before manufacturing.
🌐 3. Web-Based & Visual Simulators
Falstad Circuit Simulator
If you want to see the electricity flowing, Falstad is magic. It animates current flow as moving dots and colors wires based on voltage. It runs entirely in your browser and is the best tool for intuitively understanding how capacitors charge, how inductors react, and how diodes clamp signals.
EasyEDA (Standard & Pro)
Backed by LCSC and JLCPCB, EasyEDA is a cloud-based schematic and PCB tool. While its native simulation (NGSpice) is basic, its seamless integration with component libraries and PCB manufacturing makes it the go-to for rapid prototyping.
🐧 4. Open Source & Academic Engines
- ngspice: The open-source engine that powers KiCad and many other tools. Command-line based but incredibly powerful.
- QUCS / QUCS-S: Quite Universal Circuit Simulator. Excellent for RF (Radio Frequency) and microwave circuit design, S-parameters, and Smith charts.
- GnuCap: A GNU circuit analysis package great for Linux purists who prefer batch-mode analysis.
🏢 5. Professional / Enterprise (Paid)
- PSpice (Cadence): The industry standard for complex analog and mixed-signal simulation. Expensive, but required in many corporate engineering environments.
- NI Multisim: Widely used in universities. Great for students learning circuit theory with its interactive 3D breadboard and virtual instruments (oscilloscopes, multimeters).
- SIMetrix / SIMPLIS: The absolute gold standard for switching power supply design. SIMPLIS handles the discontinuous nature of PWM switching much better than traditional SPICE.
- TINA-TI: A free, stripped-down version of TINA provided by Texas Instruments, excellent for testing TI op-amps and power ICs.
❓ Frequently Asked Questions (FAQ)
What is the best free SPICE simulator for power electronics?
LTspice is the undisputed champion for power electronics and SMPS design due to its speed and massive library of switching regulators. Micro-Cap 12 is a close second with a much better user interface.
How can I simulate an ESP32 or Arduino circuit with code?
Use Wokwi. It is free, runs in your browser, and accurately simulates ESP32 WiFi, I2C/SPI peripherals, and custom C++/MicroPython code without needing physical hardware.
Can I design a PCB and simulate it in the same software?
Yes. KiCad (free), EasyEDA (cloud), and Altium/Proteus (paid) all allow you to capture the schematic, simulate it, and route the PCB in a single workflow.
🎯 Conclusion
The days of needing a $5,000 license to simulate a circuit are over. Whether you are analyzing the thermal dissipation of a MOSFET in LTspice, debugging an I2C sensor on an ESP32 via Wokwi, or routing your first PCB in KiCad, the tools available to makers in 2026 are incredibly powerful. Pick the one that fits your workflow, fire up the simulator, and start building!
What is your go-to simulation software? Did I miss your favorite hidden gem? Drop a comment below, I read every single one!
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