I need a good circuit simulation software for a new electronics project.

Choosing the right circuit simulation software depends heavily on what kind of project you're building—whether it's heavy on analog power design, digital microcontrollers, or quick breadboard prototyping.

Here are the top-rated circuit simulators broken down by category:

1. Best for Analog, Power, & Filters: LTspice

• The Lowdown: An industry-standard, robust, and completely free SPICE-based simulator owned by Analog Devices. It is legendary for its speed and capacity to handle massive analog networks, switching regulators, and operational amplifiers.
• Best for: Power supplies, analog signal conditioning, and precise component modeling.
• Platform: Windows and macOS.

2. Best Browser-Based & Quick Testing: CircuitLab or Falstad

• The Lowdown: If you don't want to deal with heavy installations, CircuitLab offers an intuitive cloud-based schematic editor and simulator. For a more visual, real-time wave animation approach, Falstad Circuit Simulator is a beloved free web tool for instantly seeing current flow.
• Best for: Quick proof-of-concept designs, sharing schematics online, and educational use.
• Platform: Web browser (cross-platform).

3. Best for Beginners & Arduino/Makers: Tinkercad Circuits

• The Lowdown: Autodesk's Tinkercad Circuits lets you drag and drop components onto a virtual breadboard. It includes virtual multimeters, oscilloscopes, and the ability to write and simulate Arduino code directly in the browser.
• Best for: Hobbyists, students, and basic microcontroller/sensor testing.
• Platform: Web browser.

4. Best Professional All-In-One (Paid): Proteus Design Suite or Altium Designer

• The Lowdown: If you are building professional hardware that requires seamless transition from schematic capture to PCB layout and deep microcontroller co-simulation (like debugging firmware alongside hardware), Proteus or Altium are the gold standards.
• Best for: Commercial product development and advanced mixed-signal engineering.
• Platform: Windows (Paid/Enterprise).

To help narrow it down, tell me:

• What kind of project are you building (e.g., power supply, audio amplifier, Arduino/microcontroller , or RF circuit)?
• Do you prefer a free tool , or are you looking at paid professional suites?

The best circuit simulation software depends on what kind of electronics project you’re building. Here are the strongest choices:

My recommendations by project type

• Power supply, buck converter, MOSFET switching, analog amplifier: Start with LTspice. It is probably the quickest path to accurate results.
• You plan to design a PCB afterward: Use KiCad. You can keep the schematic and simulation connected to the same project, with ngspice handling simulation.
• You are learning electronics: Try Falstad first, then move to LTspice once you understand the basics.
• You are designing a complex commercial product: Look at PSpice, Cadence tools, or other professional EDA suites.

For a new personal electronics project, my default choice would be:

1. KiCad + ngspice if you expect to make a PCB.
2. LTspice if you mainly need to verify circuit behavior.

If you tell me what you’re building (audio circuit, microcontroller board, power supply, RF, motor driver, etc.), I can suggest the best simulator and workflow.

Choosing the right circuit simulation software depends heavily on your experience level, whether you're working with analog components, microcontrollers (like Arduino or ESP32), or designing a full PCB.

The top options are broken down below by category to help you pick the best match for your project:

1. Best for Analog, Power, and General SPICE Simulation

• LTspice (Free / Windows & Mac)
  • The Vibe: The gold standard for analog designers. It’s lightning-fast, robust, completely free, and heavily utilized in the industry.
  • Best for: Switching regulators, power supplies, operational amplifiers, filters, and discrete analog circuitry. It includes a massive library of models from Analog Devices and third parties.
• KiCad (Free, Open-Source / Windows, Mac, Linux)
  • The Vibe: An all-in-one powerhouse. While primarily a top-tier open-source PCB layout suite, it features integrated SPICE simulation (via Ngspice) straight from your schematic editor.
  • Best for: Projects where you plan to go from a simulated schematic all the way to a physical printed circuit board (PCB).

2. Best for Microcontrollers & IoT Projects (Arduino, ESP32, etc.)

• Wokwi (Free / Browser-based)
  • The Vibe: An incredible, modern online simulator that lets you run real microcontroller code (Arduino, ESP32, Raspberry Pi Pico) alongside sensors, LCDs, and Neopixels.
  • Best for: Rapidly testing firmware and hardware wiring in your browser without needing physical components on hand.
• Tinkercad Circuits (Free / Browser-based)
  • The Vibe: Extremely visual, beginner-friendly, and set up like a virtual breadboard.
  • Best for: Absolute beginners, educational setups, or simple Arduino logic verification using block or text coding.

3. Best for Power Electronics and Motor Drives

• Altair PSIM (Paid / Industry-grade)
  • The Vibe: Specialized strictly for power conversion and motor control simulation.
  • Best for: High-power electronics, renewable energy converters, and electric drive systems where standard SPICE takes too long to converge or compute.

4. Best for Quick, No-Install Prototyping

• CircuitLab (Freemium / Browser-based)
  • The Vibe: A clean, slick online schematic capture and DC/AC/time-domain simulation tool.
  • Best for: Quick theoretical tests, classroom work, and easily sharing interactive schematics via a web link.

To help narrow it down, tell me a bit more about your project:

• Is it mostly analog, digital, or powered by a microcontroller (like Arduino/ESP32)?
• Do you plan on manufacturing a custom PCB later on?

If you want one good general-purpose choice, I’d start with LTspice. It’s free, fast, and particularly strong for analog, power-supply, transistor, op-amp, and switching-circuit work. The current release is 26.0.2, with Windows and macOS support.

Good options depending on your project

• LTspice — Best overall for analog/power

• Free and unrestricted.

• Excellent waveform analysis and SPICE simulation.

• Large collection of Analog Devices models, plus support for third-party models.

• My default recommendation if you're designing an amplifier, power supply, filter, sensor circuit, motor driver, etc.

• KiCad — Best if you're also making a PCB

• Free and open source.

• Its schematic editor has integrated ngspice simulation.

• You can go from schematic → simulation → PCB layout without redrawing the circuit.

• Falstad CircuitJS — Best for learning and quick experiments

• Runs in a browser.

• Very visual; it makes voltage/current behavior easy to understand.

• Great for quickly experimenting with RC circuits, transistors, filters, logic, etc.

• QSPICE — Worth considering for more advanced simulations

• Free SPICE simulator with additional behavioral-modeling capabilities.

• Particularly interesting if you're doing sophisticated power electronics or mixed behavioral models.

What I'd choose

If you tell me what you're building (for example, “12 V → 5 V power supply,” “audio amplifier,” “Arduino sensor board,” “motor controller,” etc.), I can recommend the best simulator and explain exactly how I'd set it up.

Absolutely. For a new electronics project, I’d narrow it down to a few good choices:

• analog.com — Best overall for analog circuits. Free, fast, and excellent for op-amps, filters, transistor circuits, power supplies, switching converters, and other analog designs. It has a strong waveform viewer and a large collection of models.
• kicad.org — Best if you're actually building a PCB. KiCad combines schematic capture, PCB layout, and an integrated ngspice simulator, so you can simulate the same project you're designing for fabrication.
• falstad.com — Best for learning and quick experiments. It's browser-based and visually shows voltage and current flowing through a circuit, making it particularly intuitive for trying ideas quickly.
• ngspice.sourceforge.io — Best open-source SPICE engine. Powerful and flexible, though less beginner-friendly by itself. KiCad uses it as its simulation engine.

What I'd pick

If you tell me you're designing something like a microcontroller board, audio circuit, power supply, RF circuit, motor controller, or analog sensor, my recommendation changes somewhat.

For a typical hobby/prototype project, I'd go with KiCad + its built-in SPICE simulator. You get the simulation capability and the schematic/PCB workflow in one package.

If the project is primarily analog or power electronics, I'd start with LTspice instead.

If you tell me what you're building and what operating system you're on (Windows/Mac/Linux), I can recommend the best simulator and setup for it.

To give you the best recommendation, it helps to know what kind of project you're working on (analog, digital logic, microcontrollers, or power electronics).

The Industry Standard (Free & Heavy-Duty Analog)

• LTspice : Developed by Analog Devices, LTspice is arguably the most popular free, high-performance SPICE simulator used by engineers worldwide. It excels at analog circuits, power supplies, and filter design. The interface looks a bit dated, but its raw simulation performance and extensive component libraries are hard to beat.

Modern Free Alternatives

• QSPICE : A newer, ultra-fast mixed-mode simulator created by Qorvo. It addresses some of LTspice's historic shortcomings by featuring a smoother, modernized layout, native Verilog digital integration, and a very quick semiconductor model generator.

All-in-One Design & PCB Transition

• EasyEDA : If your project will eventually become a printed circuit board, EasyEDA is a fantastic browser-based tool. It lets you capture schematics, run SPICE simulations using built-in virtual instruments (oscilloscopes, multimeters), and seamlessly transition straight into PCB layout without changing software.
• KiCad : A powerful, open-source professional desktop suite. While its focus is schematic capture and PCB layout, it integrates native circuit simulation capabilities (via Ngspice) so you can test theories before routing your board.

Quick, Visual & Educational

• Falstad Circuit Simulator Applet : An amazing in-browser, real-time interactive simulator. It animates voltage levels and current flow visually right over the wires, making it incredible for quickly testing simple concepts or visualizing how a filter or oscillator behaves.
• Tinkercad Circuits : Perfect if your project involves an Arduino or basic microcontrollers combined with sensors and breadboards. It runs in your browser and lets you test code alongside virtual wiring.

To help narrow this down, tell me a bit more about your project:

• Is it primarily analog, digital, or does it use a microcontroller (like an Arduino/ESP32)?
• Do you plan to design a physical PCB later on?
• Do you prefer a browser-based tool or an installed desktop application?

For a new electronics project, I’d start with LTspice unless you have a specific reason to choose something else.

My recommendation: LTspice

It is free, fast, and unlimited, with schematic capture and a built-in waveform viewer. It is particularly strong for analog and power electronics, and Analog Devices provides a substantial library of component models and example circuits.

If you're planning to design an actual PCB, I'd lean toward KiCad instead:

KiCad combines schematic capture, PCB layout, and an integrated ngspice simulator, so you can keep the schematic and eventual board design in the same environment.

And if you're just experimenting with basic circuits and want something immediately accessible, Falstad is excellent:

It provides an animated visualization of voltage and current, which makes it particularly good for understanding what a circuit is doing.

If you tell me what you're building (e.g. Arduino/MCU board, audio circuit, power supply, RF, motor controller, sensor circuit), I can recommend the best simulator for that particular project and explain why.

Choosing the right circuit simulation software depends entirely on what you are building—whether it's an analog filter , a microcontroller-based IoT device, or a full PCB layout.

Here are the top options categorized by use case:

For Analog & Power Electronics

• LTspice (Free, Desktop): Developed by Analog Devices, this is the undisputed industry workhorse for analog simulation. It is lightning-fast, handles massive circuits, and is completely free (with robust models for passive components, transistors, and ICs). The interface feels a bit dated, but its accuracy is hard to beat.
• QSPICE (Free, Desktop): A modern alternative to LTspice built specifically for high-speed switching and power electronics, featuring better digital integration (Verilog support) and an easier semiconductor model generator.

For Microcontrollers, Arduino, & IoT

• Wokwi (Free / Freemium, Browser-based): Excellent if you are prototyping with Arduino, ESP32, or Raspberry Pi Pico. It allows you to run real firmware code, simulate Wi-Fi/sensors, and debug live right in your browser.
• Tinkercad Circuits (Free, Browser-based): The ultimate beginner-friendly tool for drag-and-drop basic circuits, simple microcontrollers, and educational electronics.

For End-to-End PCB Design & Simulation

• KiCad (Free, Open-Source Desktop): A brilliant open-source electronics design suite. It integrates schematic capture, an ngspice-based circuit simulator, and a professional PCB layout editor all in one workflow.

For Quick Conceptual Learning & Visualizing

• Falstad Circuit Simulator Applet (Free, Browser-based): A fantastic interactive online simulator where you can see current flow and voltages animated in real-time. It's lightweight and unmatched for quickly visualizing how a conceptual circuit behaves.

To help narrow down the best choice, tell me:

• What kind of project are you building (analog audio, power supply, microcontroller/IoT, digital logic)?
• Do you prefer a browser-based tool or an offline desktop application?

Absolutely. For a new electronics project, I’d narrow it down to these:

My recommendation

If your project is primarily analog electronics: go with LTspice. It's free, fast, includes schematic capture and waveform analysis, and is particularly good for testing real component models. The current version is 26.0.2 as of July 2026. www.analog.com 

If you're going to design an actual PCB: I'd choose KiCad. Its schematic editor has an integrated ngspice simulator, so your simulation schematic and eventual PCB design can live in the same ecosystem. www.kicad.org 

KiCad is especially attractive because it's open source and includes schematic capture, PCB layout, ERC checking, and 3D visualization in addition to simulation. www.kicad.io 

If you just want to experiment quickly: Falstad is excellent for seeing current and voltage behavior visually without learning much SPICE syntax.

If you tell me what you're building (e.g. Arduino/ESP32 circuit, audio amplifier, power supply, motor controller, RF circuit, analog sensor, digital logic), I can recommend the best simulator for that specific project and explain why.

Finding the right circuit simulator depends on whether you need quick schematic capture, heavy-duty analog/digital SPICE analysis, or an interactive beginner-friendly playground.

Here are the top circuit simulation software options broken down by use case:

• LTspice (Analog Devices): The industry-standard, high-performance SPICE simulator. It is completely free, incredibly robust, and heavily optimized for switching regulators and analog circuits.
• KiCad : An open-source suite that combines schematic capture with a powerful simulator (ngspice integration) and PCB layout. Great if you plan to turn your simulation into a physical board.
• Falstad Circuit Simulator : A fantastic, lightweight browser-based interactive simulator. It visualizes current, voltage, and charge flow in real-time, making it unmatched for quick testing and educational intuition.
• TINA-TI (Texas Instruments): A powerful SPICE-based circuit simulator tailored heavily toward designing and analyzing TI components and general analog/digital circuits.
• EveryCircuit : A sleek, highly visual interactive simulator available for web and mobile devices. Perfect for experimenting with waveforms and circuit behaviors on the go.

To help narrow down the best fit for your specific project, tell me:

• Are you working with mostly analog, digital, or microcontroller/mixed-signal components?
• Do you need an offline desktop app or a browser-based tool?
• Do you eventually need to design a PCB from this circuit?