Getting Started

No account required to start — sign up only when you want to save your work to the cloud.

Open the simulator

Go to sim.devoltapp.com. The editor loads immediately in your browser. No download, no install.

Your first circuit

We’ll build an LED circuit: a 5 V supply, a current-limiting resistor, and an LED.

1. Open the component palette — click the palette icon in the left toolbar, or press P.
2. Place a 5 V Supply — find it under Sources, drag it onto the breadboard, and drop it on any row.
3. Place a Resistor — find it under Passive. A 220 Ω resistor is a safe choice for a 5 V circuit with a standard LED.
4. Place an LED — find it under Output. Red, Green, Blue, White, Yellow, and Amber LEDs are available.
5. Wire the components — click any pin dot, drag to another pin, and release. The simulator draws the wire automatically.
   • Connect the + pin of the supply to one leg of the resistor.
   • Connect the other resistor leg to the anode (+) of the LED.
   • Connect the cathode (–) of the LED back to the GND symbol you dragged from Sources.
6. Run the simulation — click the ▶ button in the toolbar, or press Space. The LED glows and the live current value appears in the Inspector panel.

Inspector panel

Click any component to see its live voltages, currents, and parameters on the right-hand Inspector panel. You can edit parameter values (like resistance or capacitance) while the simulation runs and see the circuit respond in real-time.

Keyboard shortcuts

Saving your work

Click Sign in in the header, enter your email, and follow the magic link. Once signed in, Cmd/Ctrl + S saves the circuit to your cloud project list at /dashboard. Projects sync across devices automatically.