What is EnggViz RTL Lab?

EnggViz RTL Lab is a free, browser-based Verilog IDE and RTL simulator. It integrates Icarus Verilog for simulation, Yosys for RTL synthesis, WaveDrom for waveform visualization, and a Monaco-based editor with live Verible linting — all without any installation.

How do I simulate Verilog online for free?

Visit lab.enggviz.online, write or load a Verilog module and testbench in the editor, then press Ctrl+Enter or click Simulate. The waveform output renders automatically in the Timing tab.

Does EnggViz RTL Lab support SystemVerilog?

Yes. The editor supports SystemVerilog syntax highlighting and linting via Verible. Icarus Verilog on the backend supports a subset of SystemVerilog constructs including logic, always_ff, always_comb, and packed arrays.

Can I generate RTL schematics online without installing any tool?

Yes. Click the RTL button after writing your design. EnggViz uses Yosys to synthesize your Verilog into a gate-level or abstract RTL netlist, rendered as an interactive schematic directly in the browser.

Online Verilog IDE & RTL Simulator

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// EnggViz RTL Lab — ready.
// Load an example or write HDL to begin.

SILICON AI COPILOT

Greetings, engineer. Describe an architectural objective, or paste your logic paths — let's shape optimized silicon together.

No waveform yet — run Simulate.

No schematic yet — run RTL.

Resource Report

Wires—

Cells—

Flip-Flops—

Click the FSM tab to extract state machines.

Board Constraint Generator

Map RTL ports → physical FPGA pins

Load a module to map pins.

READY

module.v

1 line

lint: —

Ctrl+Enter simulate Ctrl+H find Shift+Alt+F format

EnggViz RTL Lab v2.2

Resource Report

Board Constraint Generator

About EnggViz Online Verilog IDE

Features & Capabilities