PROTO - circuit simulator

In-app purchases
4.2
11.9K reviews
10L+
Downloads
Content rating
PEGI 3
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About this app

Are you looking for tools like Multisim, SPICE, LTspice, Proteus, Altium or PhET simulations? That's great! PROTO is an real time electronic circuit simulator which means you are able to setup a circuit with various components and simulate behaviour of the electronic circuit ⚡
During simulation you can check voltages, currents and many other variables. Check signals on multichannel oscilioscope and tune your circuit in real time! Our app can greatly help with your Raspberry Pi, Arduino or ESP32 project. You can also use PROTO as logic circuit simulator and perform digital electronic analysis!

ℹ️ You can report an issue or make component request at Github

👉 Features:
✅ Animations of voltage values and current flows
✅ Adjusts circuit parameters (like voltage, current and other)
✅ Four-channel oscilloscope
✅ Single play/pause button to control simulation
✅ Copy electronic components
✅ Learn about electronic circuits by examples in app
✅ Share circuit with friends
✅ Themes (Dark, Light, Ocean, Solarized)
✅ PNG, JPG, PDF circuit export
✅ Export workspace
✅ Video tutorials about electronics
🔥 Arduino support in future

👉 Components:
+ DC, AC, Square, Trinagle, Sawtooth, Pulse, Noise voltage source
+ Current source
+ Resistor
+ Potentiometer
+ Capacitor
+ Polarized capacitor
+ Inductor
+ Transformer
+ Diode (rectifying diode, LED, Zener, Schottky)
+ Transistor (NPN, PNP, N and P channel Mosfet)
+ Switches (SPST, Relay)
+ Bulb
+ Operational amplifier
+ Timer 555 (NE555)
+ Digital Gates (AND, NAND, OR, XOR, NOR, NXOR, Inverter)
+ Voltmeter
+ Ammeter
+ Fuse
+ Photoresistor (uses phone light sensor)
+ Analog-to-digital converter (ADC)
+ Accelerometer (uses phone accelerometer sensor)
+ FM source
+ Logic Input
+ Memristor
+ Logic output
+ Probe
+ Voltage rail

👉 Analog Pack:
+ Tunnel diode
+ Varactor
+ NTC Thermistor
+ Center tapped transformer
+ Schmitt trigger
+ Schmitt trigger (inverting)
+ Solar cell
+ TRIAC
+ DIAC
+ Thyristor
+ Triode
+ Darlington NPN
+ Darlington PNP
+ Analog SPST
+ Analog SPDT
Digital Pack:
+ Adder
+ Counter
+ Latch
+ PISO Register
+ SIPO Register
+ Seven segment decoder
+ Sequence generator
+ D Flip-flop
+ T Flip-flop
+ JK Flip-flop
+ Multiplexer
+ Demultiplexer
+ Voltage controlled current source (VCCS)
+ Voltage controlled voltage source (VCVS)
+ Current controlled current source (CCCS)
+ Current controlled voltage source (CCVS)
+ Optocoupler

👉 Misc Pack:
+ Wobbulator
+ AM Source
+ SPDT Switch
+ Digital to analog converter (DAC)
+ Antenna
+ Spark gap
+ LED Bar
+ 7 segment LED
+ RGB LED
+ Ohmmeter
+ Audio input
+ Microphone
+ Device battery
+ DC Motor
+ 14 segment LED
+ Diode bridge
+ Crystal
+ Voltage regulators (78xx family)
+ TL431
+ Buzzer
+ Frequency meter

👉 JavaScrip Pack:
+ Write code
+ JavaScript interpreter (ES2020 class)
+ Access to IC inputs in code
+ Access to IC outputs in code
+ Four custom ICs

👉 7400 TTL Pack:
+ 7404 - hex inverter
+ 7410 - triple 3-input NAND Gate
+ 7414 - hex Schmitt-trigger inverter
+ 7432 - quadruple 2-input OR gate
+ 7440 - dual 4-input NAND buffer
+ 7485 - 4-bit magnitude comparator
+ 7493 - binary counter
+ 744075 - triple 3-input OR gate
+ 741G32 - single 2-input OR gate
+ 741G86 - single 2-input XOR gate

👉 4000 CMOS Pack:
+ 4000 - dual 3-input NOR gate and inverter.
+ 4001 - quad 2-input NOR gate.
+ 4002 - dual 4-input NOR gate.
+ 4011 - quad 2-input NAND gate.
+ 4016 - quad bilateral switch.
+ 4017 - 5-stage Johnson decade counter.
+ 4023 - triple 3-input NAND gate.
+ 4025 - triple 3-input NOR gate.
+ 4081 - quad 2-input AND gate.
+ 4511 - BCD to 7-segment decoder.

👉 Sensors pack:
+ Pressure
+ Gyroscope
+ Light
+ Magnetic field
+ Proximity
+ Temperature
+ Humidity
Updated on
20 Sept 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Financial info, App activity and 2 others
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

4.2
11.2K reviews
RikxianELE 309
18 July 2025
Good enough i guess... It is full of stupid bugs though! 1 is where it wont properly calculate values. 2 When i had an accidental short circuit which blew a fuse and after i removed the short, the fuse still keeps blowing. same goes for when i accidentally shorted a capacitor and it wont stop complaining 'shorted capacitor X' 'fuse blew, click edit to fix' 'cant solve circuit' so such stupid nonesense bugs and not much other components in the extension packs so its not the best
1 person found this review helpful
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Leopy Periz
7 September 2025
A bit more stable than EveryCircuit, but not by much. Uninstalling because after a circuit reported "unable to solve", no matter what I did I could never revert back to when it worked. A lot of time wasted. Also, the lack of wire autorouting and the precision with which you need to select wires and components is extremely frustrating. Also, why can't I connect a wire to another one, unless there is already a junction?!
3 people found this review helpful
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Brendon Steenkamp
28 September 2025
Would give it a 5, but there is minimal support and a community page with shared circuits would be a great addition to the app for users who have bought some add-ons. And for some or other reason when I select to change a parameter of a component, it zooms quite deep into the circuit, which annoys me because when I zoom out again I move the selected component. It would be fine if it does not do the zooming at all
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What's new

> [DIGITAL PACK] Add RESET and SET terminals in DFlipFlop component
> Add ability to change voltage threshold (Vth or Vgs) in Mosfet component
> [TTL PACK] New components:
> 7424 - quad 2-input Schmitt-trigger NAND gate
> 7451 - dual AND-OR-Invert (AOI) gates
> [CMOS PACK] New components:
> 4013 - dual D-type flip-flop
> 4043 - quad 3-state R/S latch