Introducing Nexsim

Welcome to Nexsim, a modern VHDL simulator built for the way you work.

What is Nexsim?

Nexsim is a VHDL simulation tool with an integrated waveform viewer. The core simulator is written in Rust for performance and compiled to WebAssembly, making it possible to run simulations directly in your browser.

Three ways to use it

Web app — Open app.nexsim.dev and start simulating immediately. No installation required.

Desktop app — Download the native app for macOS, Windows, or Linux. Works offline with native performance.

CLI — Run headless simulations and output VCD files. Perfect for CI pipelines or use with tools like GTKWave and Surfer.

What’s next?

We’re just getting started. Follow along on the blog for updates.