Arduino
Uno, Nano, Mega, ESP8266, and ESP32 boards run your C++ sketches, with the libraries you already use: Servo, NeoPixel, SPI, EEPROM, DHT, Keypad, and Adafruit’s SSD1306 and GFX.
New in 1.16
Raspberry Pi Pico, SPICE, Verilog, and VHDL
The circuit simulator that’s always on.
Design analog and digital circuits from more than 300 components, measure them with a built-in multimeter and oscilloscope, and program the microcontrollers that run them. Everything simulates live while you work.
Always simulating. Just like the real thing.
Use iCircuit like a CAD tool: add components, wire them up, and set their values. But it never stops simulating. There’s no run button and no report to configure. You play with the circuit with the power on.
- Wires glow with their voltage and moving dots show the current, so you can watch a circuit work.
- Drag a slider, flip a switch, or change a value and see the result instantly.
- Push a part too hard and iCircuit warns you about over-voltage and over-power, instead of letting the smoke out.
A bench full of test equipment.
Every circuit comes with the instruments to understand it. Nothing extra to buy, nothing to wire up.
- Oscilloscope Track many signals at once, scroll back in time, read RMS, peak‑to‑peak, and frequency, and switch to FFT, Bode, or XY views.
- Multimeter Tap any wire or part to read its voltage, current, and power.
- Gauges Put live readouts of voltage, current, frequency, and resistance right in the schematic.
- Sources and generators Signal generators, sweeps, and DC, AC, and dependent sources to drive it all.
More than 300 components.
From resistors to vacuum tubes to NeoPixels, with 60 4000‑ and 7400‑series logic ICs built in and 180+ with iCircuit Pro.
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Passives
Resistors, potentiometers, capacitors, inductors, transformers, crystals, and memristors.
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Semiconductors and tubes
Diodes, varactors, BJTs, MOSFETs, op‑amps, SCRs, diacs, triacs, optocouplers, triodes, and tetrodes.
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Power
DC and AC sources, 78xx and LM317 regulators, power and barrel jacks, and H‑bridges.
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Digital logic
Gates, flip-flops, counters, 555 timers, EEPROMs, ADCs and DACs, and 4000‑ and 7400‑series ICs.
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Displays and lights
LEDs, RGB LEDs, lamps, 7‑segment displays, bar graphs, LED matrices, NeoPixels, and OLEDs.
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Sensors
Light, temperature, humidity, pressure, strain, and motion sensors, including the DHT22 and MPU6050.
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Electromechanical
DC, AC, and servo motors, relays, switches, push buttons, and keypads.
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Radio and audio
AM and FM antennas, transmission lines, speakers, buzzers, microphones, and audio jacks. Audio isn’t available on Windows yet.
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Program the chips that run your circuit.
Microcontrollers in iCircuit aren’t a separate simulator bolted on. Their pins are part of the same solver as every resistor and capacitor, so a PWM pin really drives your RC filter and a potentiometer really sets what the ADC reads.
New in 1.16
Raspberry Pi Pico and Pico 2
iCircuit emulates the RP2040 and RP2350 chips themselves and boots the stock MicroPython or CircuitPython firmware. Your code runs on the real interpreter, with GPIO, PWM, ADC, I2C, SPI, UART, and even PIO, right down to the tracebacks.
PIC
Program PIC microcontrollers, including the PIC16F877A with SPI and I2C, in assembly or with HEX files.
Custom elements
Write your own chips in an Arduino-like language, draw their faces, and share them in the iCircuit Gallery.
Real models. Real logic.
Go beyond the built-in parts with the same formats engineers use every day.
New in 1.16
SPICE subcircuits
Paste a manufacturer’s .SUBCKT with its .MODEL cards and it becomes a part you wire up like any other. BJTs, MOSFETs, diodes, dependent sources, coupled inductors, nested and parameterized subcircuits, and .INCLUDE are all supported.
New in 1.16
Verilog and VHDL
Write synthesizable Verilog or VHDL in the HDL element. Its ports become pins you can wire to LEDs, switches, clocks, and microcontrollers, and combinational loops are caught at compile time.
Subcircuits
Turn any circuit into a reusable part with its own pins, and build big designs out of small ones.
Expressions
Plot math on the scope, like the difference between two signals, and set a resistor’s value with an expression.
The only native mobile app with SPICE, Verilog, VHDL, and MicroPython simulation.
Made for learning, making, and engineering.
Students and educators
Ohm’s law, transients, transistors, logic, and microcontrollers in one app, with nothing to burn out. Schools get Apple’s education discount when they buy in volume.
Makers
Try your Arduino or Pico project before you solder: the circuit, the code, and the parts, all together and all live.
Engineers
Sanity-check an idea with vendor SPICE models, HDL glue logic, and live measurements, wherever you are.
Buy it once. It’s yours.
Buy iCircuit once and it’s yours, with free updates. iCircuit Pro is an optional subscription on iPhone, iPad, and Mac for power users and anyone who wants to support development.
Questions
Which devices does iCircuit run on?
iPhone, iPad, Mac, Windows, and Android. The new 1.16 features (Raspberry Pi Pico, SPICE subcircuits, and Verilog and VHDL) are available now on iPhone, iPad, and Mac. Audio isn’t available on Windows yet.
How much does it cost?
iCircuit is a one-time purchase with free updates. Prices vary by store and country, and each store page shows the current price. iCircuit Pro is an optional subscription on iPhone, iPad, and Mac.
What does iCircuit Pro add?
iCircuit Pro is an optional subscription on iPhone, iPad, and Mac for power users and anyone who wants to support development. It adds extra components, including more PIC microcontrollers and a library of 180+ 4000‑ and 7400‑series ICs. Everything else in iCircuit works without it.
Can I try it first?
The Windows version has a free trial in the Microsoft Store. The App Store and Google Play don’t offer trials for paid apps. If you’d like a second opinion first, the Mac version is rated 4.7 stars on the Mac App Store.
Does it support SPICE, Verilog, and VHDL?
Yes. Import SPICE subcircuits with their .MODEL cards and use them as components, or write synthesizable Verilog or VHDL in the HDL element and wire it to the rest of your circuit.
Can it run my Arduino or Raspberry Pi Pico code?
Yes. Arduino Uno, Nano, Mega, ESP8266, and ESP32 boards run C++ sketches. Raspberry Pi Pico and Pico 2 boards boot the real MicroPython or CircuitPython firmware and run your Python as is. PIC microcontrollers run assembly and HEX files.
Can schools buy it in volume?
Yes. Schools get Apple’s education discount when they buy iCircuit in volume through Apple School Manager. See how to buy apps in Apple School Manager.
Do my circuit files work on other devices?
Yes. iCircuit files open on every platform, and you can share circuits through the iCircuit Gallery or by email.
Does it need an internet connection?
No. Everything simulates on your device, and you don’t need an account to use the app.