PROTO - circuit simulator

Powerful real time circuit simulator for learners and makers

PROTO – circuit simulator delivers a surprisingly capable electronics lab that fits in your pocket, offering real-time simulation tools that feel closer to desktop software than a typical on-the-go utility. It lets you build analog and digital circuits from a broad component library and immediately see how they behave under different conditions.

The interface is clean and intuitive, with draggable components like resistors, capacitors, inductors, diodes, transistors, op-amps, logic gates, and even a classic 555 timer. Animations show current flow and voltage levels directly on the schematic, which is especially helpful for beginners trying to visualize what is actually happening in a circuit.

One standout feature is the integrated four-channel oscilloscope. You can probe multiple nodes, watch waveforms update in real time, and fine-tune parameters such as voltage and frequency while the simulation is running. A simple play/pause control keeps simulations easy to manage, and copying components speeds up building more complex designs.

PROTO is also well suited for hobbyists working on Raspberry Pi, Arduino, or ESP32 projects, letting you prototype and debug ideas before wiring them up. Export options to PNG, JPG, and PDF make it convenient to share or document your work, and multiple themes (Dark, Light, Ocean, Solarized) help keep long sessions comfortable.

On the downside, very advanced users may eventually bump into limits compared to full-scale professional suites, especially for extremely large or highly specialized circuits. There is no deep PCB design or microcontroller code simulation yet, although Arduino support is planned.

Overall, PROTO is an impressive, accessible circuit simulator that strikes a smart balance between educational tool and serious design aid, making it a strong choice for students, makers, and electronics enthusiasts alike.