cmpl is a free online VHDL compiler and simulator for students of Digital System Design. Write VHDL in the browser, run testbenches, inspect waveforms and get clear explanations of common mistakes. Everything runs in your browser and can work offline.
Create your account by signing in with Google; an administrator approves new accounts. After that you can also set a cmpl password, so you can sign in on any computer without Google. We use your Google email, name and profile picture only to identify you and manage access, and we record basic usage (sign-ins, runs and the code you run) for coursework review.