KAVROUSTECHNOLOGIES

OpenChippy

Design digital circuits.
See how they work.

Draw CMOS schematics, build reusable circuit blocks, inspect digital waveforms, and explore generated layouts in 3D.

OpenChippy is an open-source desktop workspace for learning and experimenting with chip design.

Download the alphaWatch the circuit demo

v0.1.0-alpha.1 · Apple Silicon macOS · GPL v3

OpenChippy's desktop 3D view showing colored process layers, routing, and vias in a generated circuit layout.
A four-bit adder in OpenChippy’s 3D workspace. View full-size screenshot

Build with transistors and reusable blocks.

Start with NMOS and PMOS devices, connect inputs and output probes, and turn a working circuit into a block you can use again. Nest those blocks to build larger designs without redrawing every transistor.

An XOR circuit assembled from four reusable NAND2 blocks in the real OpenChippy schematic editor. The design rules panel reports no basic connectivity issues.
An XOR circuit assembled from four NAND blocks. View full-size screenshot

From a small circuit to a physical layout.

Complete an XOR circuit built from NAND blocks, then switch to a four-bit adder with nested full-adder blocks and 144 transistors. Watch its physical layout generate and inspect the result in 3D.

Recorded in the real desktop app; project changes and pauses are edited. Accelerated sections are labeled. Read the descriptive transcript

Follow the signals over time.

Run a timed input sequence and compare it with the circuit’s output. Move the cursor to inspect signal values, zoom into transitions, and group related inputs into a binary or hexadecimal bus.

The same XOR circuit in waveform view. Silent recording with descriptive captions. View screenshot · Read the descriptive transcript

Try OpenChippy.

The alpha is available on GitHub, along with the source, release notes, and example projects. Feedback and bug reports are welcome.

Download alpha on GitHubBrowse the source