CircuitLab

Schematic editor and circuit simulator.Build and test circuits right in your browser!

* Design with our easy-to-use schematic editor.
* Accurate analysis (DC, AC & more) in seconds.
* Beautiful schematic printouts (PDF) and images (PNG).
* Share a live circuit URL so others can simulate and edit your circuit.

Easy-wire mode lets you connect elements with fewer clicks and less frustration.

Cross-window copy/paste lets you easily explore and re-mix parts of public circuits from the CircuitLab community.

Mixed-mode circuit simulation lets you simulate analog and digital components side-by-side.

SPICE-like component models give you accurate results for nonlinear circuit effects.

Human-friendly formats let you enter and display values concisely, just like you would on a paper schematic.

Unit-aware expression evaluation lets you plot arbitrary signals of interest, such as differential signals or power dissipation.

In-browser simulation and plotting lets you design and analyze faster, making sure your circuit works before ever picking up a soldering iron.

Unique circuit URLs let you easily share your work or ask for help online.

Advanced simulation capabilities include frequency-domain (small signal) simulation, stepping circuit parameters through a range, arbitrary Laplace transfer function blocks, and more.

Common sense schematics let you name a node "+5V" and know that the simulator will do the right thing automatically, keeping your schematics compact and elegant.

Quick-access build box lets you draw basic circuit primitives quickly, while allowing access to a wide assortment of non-linear elements, feedback elements, digital / mixed-mode components, and custom drawing tools.

For more information, visit https://www.circuitlab.com/