Thriving 
JS Verilog in your browser — fully client-side. A browser-based Verilog simulator built by compiling Icarus Verilog to WebAssembly
https://senolgulgonul.github.io/verisim/ ↗ HEALTH ? 69 / Stable
Thriving JS // readme
VeriSim
Verilog in your browser — fully client-side. A browser-based Verilog simulator built by compiling Icarus Verilog to WebAssembly. No server, no install: edit, compile, simulate, view waveforms, and synthesize to a gate-level or RTL schematic — entirely in the page.
Live: https://senolgulgonul.github.io/verisim/
Ported toolchain
VeriSim runs Icarus Verilog version 14.0 (devel), built from upstream commit c7530db (master as of 2026-05-31, the development line after the 13.0 release), compiled to WebAssembly with Emscripten.
Icarus Verilog is three cooperating programs; each is shipped here as a separate WebAssembly module:
| Program | Role | Module |
|---|---|---|
ivlpp | preprocessor (macros, includes, `line directives) | ivlpp.wasm / ivlpp.js |
ivl | compiler — elaborates Verilog and emits a .vvp program | ivl.wasm / ivl.js |
vvp | runtime — executes the .vvp program, writes the VCD | vvp.wasm / vvp.js |
How it works
A normal Icarus install runs these as separate OS…