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To download iCircuit from the Mac App Store, you need a Mac with OS X 10.6.6 or later. Learn More.


By Krueger Systems, Inc.

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iCircuit is the easiest way to design and experiment with circuits. Its advanced simulation engine can handle both analog and digital circuits and features realtime always-on analysis. It is the perfect companion to students, hobbyists, and engineers.

You use it as you would any CAD program: you add elements, connect them together, and set their properties. But iCircuit is unlike other CAD programs because it is always simulating. It's just like working with the real circuit. You do not stop to take a measurement or spend a lot of time configuring reports. Instead, you just play with the circuit as you normally would, with the power on!

There are over 30 elements you can use to build your circuits. The app has everything from simple resistors, to switches, to MOSFETS, to digital gates.

The app features a multimeter that you use to probe around the circuit to instantly read voltages and currents. If you want to see how a value changes over time, then you can add values to the built-in oscilloscope. The scope can simultaneously track many signals over time and features a variety of automatic modes that make it easy for you to grasp the behavior of your circuit.

You can even export your circuits and PNGs, PDFs, and SVG files so that they are easy to include in reports or web sites. Scope data can even be exported for offline analysis.

See a tutorial videos at:

Supported elements include:

• Signal generators, Voltage sources, and Current sources
• Resistors, Capacitors, Inductors, Potentiometers, Regulators
• SPST/SPDT Switches, Relays, and Transformers
• Diodes, BJ Transistors, and MOSFETs
• Speakers, Microphones, Buzzers, DC Motors, and LEDs
• Op-amps, ADCs, and DACs
• Logic gates: AND, OR, NAND, NOR, XOR
• JK and D Flip-flops
• Over 30 74XX series ICs

What's New in Version 1.8.1

• Fixes a critical bug that prevented OS X Mavericks users from using the app
• Fixes the Insert menu and Undo

From the previous release notes:
• Addition of in-circuit gauges to always have measurements on the screen
• Addition of 6 CMOS ICs (4000, 4001, 4002, 4011, 4017, 4051, keep requesting on the uservoice!)
• Improved wire selection
• 64-bit support
• Lots of bug fixes


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Customer Reviews

Great, but needs to be updated more frequently

I’m an electronics technician, with 38 years of experience in the industry. This app is nothing short of fantastic! This is perfect for students, techs, and engineers at all levels. For the price, you get a lot of stuff, truly a fine value. My only two complaints: 1. For an AC source, you can only adjust phase to 180 degrees. You cannot do a full 360 degrees. Reason, unknown. 2. The app is not updated frequently enough. Note to developer: More than a year between updates, gives the impression that the app has been abandoned. Try to do more frequent updates, even if it is just very minor. I have shown this to some experienced engineers, and their jaws drop.

Unreliable for real applications

Pros: No Ads!

Cons: It doesn’t work!

This app is very unstable and only works sometimes. Every time I make a change to the circuit the emulator doesn’t give a response (i.e. observed voltage change when a resistor value is changed). I have to save the file close and reopen to see the response I was looking for. Sometimes, I just get a convergence error and the circuit doesn’t work, but it worked previously. Now its not even letting me save my circuit, prompting me to write this frusturated review. A good concept, but you cant rely on this app to give you accurate results. Don’t waste your money.

It’s Awesome I love it please make it better!

The visualization of the changing current and voltages is very helpful for understanding how the circuit functions and debugging issues. Great for students especially in understanding voltage and current flow.

Bug: Sometimes the current dots disappear and I have to click pause/play simulation to get them back which disrupts my oscillator simulations.

Also please add a BJT/FET parameter analysis! I would like to see what my AC parameters are so I can calculate other values for the circuit

Thank you for your hard work! This app is amazing!

View in Mac App Store
  • $9.99
  • Category: Productivity
  • Updated:
  • Version: 1.8.1
  • Size: 3.9 MB
  • Language: English
  • Seller:

Compatibility: OS X 10.6 or later, 64-bit processor

Customer Ratings

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