iCircuit 4+

Experiment with circuits

Krueger Systems, Inc.

    • 4.7 • 190 Ratings
    • $12.99
    • Offers In-App Purchases



iCircuit is the easiest way to design and experiment with circuits. Its advanced simulation engine can handle both analog and digital circuits, Arduino microcontrollers, 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 300 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.

Supported elements include:

• Programmable Arduino using a subset of the C programming language
• Programmable PIC controllers using assembly language or hex files
• Signal generators, Voltage sources, Current sources, and Dependent sources
• Resistors, Capacitors, and Inductors
• Manual SPST/SPDT and DPST/DPDT Switches, Push buttons, and Relays
• LEDs, Diodes, BJ Transistors, and MOSFETs, Thermistors
• Triodes and tetrodes
• Audio simulation with Speakers, Microphones, Buzzers, and LEDs
• DC Motors and Servos
• ADCs, and DACs
• Logic gates: AND, OR, NAND, NOR, XOR
• JK and D Flip-flops
• 180 digital ICs from the 4000 and 7400 series
• 78xx and LM317 voltage regulators
• 7-segment and matrix displays
• Antenna with simulated AM and FM signals

I hope you love the ease of simulating circuits with iCircuit!

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

What’s New

Version 1.12.2

Version 1.12.2 improves subcircuits and contains all the new features and bug fixes from the big 1.12 release:

New elements:
* Diac and Triac
* Varactor and Memristor
* 7401, 7403, 7409, 7411, 7412, 7413, 7415, 7418, 7419, 7420, 7421, 7422, 7424, 7425, 7426, 7427, 7428, 7433, 7434, 7435, 7436, 7439, 7442, 7443, 7444, 7447, 7449, 7450, 7451, 74L51, 7453, 74H53, 7454, 74H54, 74L54, 7455, 7456, 7457, 7458, 7460, 7464, 7465, 7470, 7471, 74H71, 7472, 7473, 7475, 7476, 7477, 7478, 74LS78, 7480, 7481, 7482, 7483, 7484, 7487, 7489, 7491, 7492, 74100, 74101, 74104, 74105, 74107A, 74108, 74109, 74110, 74112, 74113, 74114, 74116, 74118, 74125, 74126, 74128, 74131, 74132, 74133, 74134, 74135, 74136, 74138, 74139, 74140, 74170, 74224, 74244, 74245, 74540, 74541, 744067, 4006, 4008, 4009, 4010, 4012, 4013, 4014, 4015, 4016, 4018, 4019, 4020, 4021, 4022, 4023, 4024, 4025, 4026, 4027, 4028, 4030, 4031, 4032, 4038, 4040, 4041, 4042, 4043, 4044, 4049
* Servo motor
* LED Matrix
* Spark gap and tunneling diodes
* H-Bridge (L293)
* LM358 VCO
* Triode and Tetrode
* Internal Ports
* Buffer and tristate buffer
* Ten segment LED bar graph
* Internal ports

New capabilities:
* Wire colors with controllable thickness
* Over-voltage warning on ICs
* Over-power ratings on resistors
* Rotate command to quickly re-orient elements
* Support for expressions on Resistor
* Improved support for Arduino structs and arrays
* Added the Arduino Servo library
* Resistance, Frequency, RMS, PP, Min and Max Voltage measurement mode on Gauge

* Better contrast in the element popup editor
* Dark mode and light mode can now be automatic or manual
* Fix low Ohmic potentiometers
* Official symbol for MOSFETs

Ratings and Reviews

4.7 out of 5
190 Ratings

190 Ratings

BB From Waltham ,

Best circuit simulator available.

I’m an electronics technician, with 41 years of experience in the industry. This app is nothing short of fantastic! This is perfect for students, techs, and engineers at all levels. The basic program is fine for most techs and hobbyists. Engineers and more advanced people would be interested in the pro version.

The latest version, 1.12, includes many requested updates to the interface, and more components. This is a very large update to this application. Thanks to the developer.

As other reviewers have noted, I have tried other simulators, but I keep coming back to iCircuit.

Oxilumin ,

This is extremely basic tool with fancy UI and almost nonexistent real life application

Got fooled by the nice UI and thought I could use it instead of free ltspice (or other similar open tool).
Apparently this tool doesn't go beyond sleek UI even in the most basic and trivial capabilities.
You have to use equivalent schematic for every single passive because it doesn't have a concept of even such trivial things as parasitic resistance/capacitance/inductance (which seems so trivial to implement - I wouldn't think it is not available here). Let alone - parametrized models for semiconductors, not even reverse breakdown for diodes. Now modelling passives is annoying but reasonably feasible, modelling semiconductors is something is something you wouldn't even consider doing, especially when they have proper spice models and can be simply plugged in into any proper software.

Giving it 2 stars instead of one just because it is a nice visual tool for school students to explain basics of how elements work and give ability to create some "ideal world" schematics in a nice UI.

atheken ,

UI Needs work

I have bought this app for ipad and mac. The basic functionality is there, and I really like the visualization of current flow when a circuit is completed, but all of the UI interactions feel really hard to use, a few examples:

The marquee (selection) mechanism should have the option of a bounding box, the "draw a selection" behavior goes against decades of muscle memory (not to mention the polygon "winds", making a selection action that much worse).

The fields for modifying a component's properties don't appear to be linked in a focus ring, and therefore I can't tab between them.

Selecting a bunch of components and then dragging causes wiring to get messed up. Most of the time, I'm just trying to clean things up, but this results in the digram junctions changing.

The forward-delete (on a fullsized keyboard) doesn't work to delete, only the delete key.

On ipad, the toggling between draw and delete modes is extremely frustrating, for example, adding a component, but then, tapping on it causes it to be deleted if you've left the delete mode enabled.

These apps aren't cheap, and I bought the Mac version because I hoped the keyboard/mouse interactions would make things easier, but honestly, the UI is almost more frustrating than on iPad.

App Privacy

The developer, Krueger Systems, Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

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