PROTO - circuit simulator

In-app purchases
4.3
11.3K reviews
1M+
Downloads
Content rating
PEGI 3
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image
Screenshot image

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

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

πŸ‘‰ 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

πŸ‘‰ 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

πŸ‘‰ 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

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

πŸ‘‰ 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

πŸ‘‰ 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.

πŸ‘‰ Sensors pack:
+ Pressure
+ Gyroscope
+ Light
+ Magnetic field
+ Proximity
+ Temperature
+ Humidity
Updated on
9 Jun 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

4.3
10.6K reviews
Elliot Turner
28 May 2025
Fairly one-dimensional. Needs a variety of ICs to be useful, like the 4000B or 7400 series in a similar way to how apps like circuit wizard have all sorts of ICs. Could also do with a setting to switch between American and European circuit symbols. Would be more convenient. But really good for a free, mobile app!
2 people found this review helpful
Did you find this helpful?
Angelo Janrei Romualdo
26 May 2025
This app is amazing but it's missing a great feature, it's about taking a screenshot because it isn't allowed by the app. While the alternative is to screenshot it in my recent apps button but it's blurry, i hope you can fix it.
Did you find this helpful?
Zak Fortier
21 January 2025
This app has potential but it needs some work. It complains improperly about shorted capacitors (make a bridge rectifier, connect an LED, put one cap in parallel, it's fine.. put 2 in parallel, now there's a short? Nonsense, this setup is common), and the simulation time step you choose changes whether the circuit even works (certain values will blow LEDs). I do like the interface, but that doesn't matter much when the basic functionality of the app isn't right.
1 person found this review helpful
Did you find this helpful?
PROTO
19 January 2025
Hello Zak. Capacitor has no internal resistance (ideal math model) and in some cases you need add small resistance between source and capacitor. Best Regards PROTO Team

What's new

> Added support for using identical project names