PROTO - circuit simulator

In-app purchases
4.2
11.5K reviews
1M+
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!

ā„¹ļø You can report an issue or make component request at Github

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

šŸ‘‰ 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

šŸ‘‰ 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

šŸ‘‰ 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

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

šŸ‘‰ 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

šŸ‘‰ 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.

šŸ‘‰ Sensors pack:
+ Pressure
+ Gyroscope
+ Light
+ Magnetic field
+ Proximity
+ Temperature
+ Humidity
Updated on
Jun 9, 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
10.8K reviews
RikxianELE 309
July 18, 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
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Michael Stern
July 21, 2025
Excellent circuit simulation. Interface could be a little more intuitive. Other apps auto-route conductors so they're not a mess. If this has that, I can't find it. The best part about the app is the model circuits. Not only can you simulate them, but you can add and remove components, take measurements - just like you built it from scratch. This app is also superior when it comes to available parts (paid option). That was the deciding factor for me. Definitely a tool worth the money.
1 person found this review helpful
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PROTO
July 21, 2025
Thank you for fair review! We have autorouting feature on our TODO list. Best Regards PROTO Team
Richard Walker
July 19, 2025
This is a very uniquely useful and approachable analog circuit simulator, with some flaws. Not being able to copy circuit patterns makes working any moderately complex circuit extremely slow. Placing wire nodes that cannot be moved is a hindrance. I thought that despite this, it was worth paying for the add-on package to support the development and gain access to the IC systems that would be most useful to me. After paying for the add-on package, however, none of it shows up.
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PROTO
July 19, 2025
Hello, could you write to us via email: [email protected] We will try to help with addons. Best Regards PROTO Team

What’s new

> New component [CMOS ADDON]: 4026 - decade counter and 7-segment display driver
> Optimized rendering by 30% with visible labels
> Try to fix JavaScript crash on Huawei MatePad T 10