A gamified fault simulation lab for VLSI students. Stuck-at, transition, IDDQ — inject them, detect them, race up the coverage leaderboard. No install, no license server.
The same fault models you'll use in industry, with a UI that turns dry simulations into something you'll actually want to run.
Stuck-at, transition delay, IDDQ, and bridge faults — all implemented in a fast in-browser engine. No toy simulator, no hand-waving.
Watch the simulation tick. Pin-level waveforms update as the simulator runs, so you can see which transition detected which fault.
Weekly challenges, monthly tournaments, and an always-on leaderboard. The fastest path to high coverage is your name at the top of the chart.
Drop in a synthesized Verilog netlist, pick a design from the library, or start from one of the curated challenges. Either way, you're simulating in 60 seconds.
The simulator compacts your test set as you go — dropping redundant patterns, marking untestable faults, and reporting the minimal pattern count.
Each Monday, a new design with a hidden fault set drops. The fastest solver with the highest coverage takes the weekly rank. Real designs, real patterns.
module add4(input [3:0] a, b, output [3:0] sum, output cout);
assign {cout, sum} = a + b;
endmodule
// inject: stuck-at-0 on add4.b[2]A toy example — the real engine runs against your uploaded netlist with thousands of faults, transition delay, IDDQ, and bridge models. Try it free with your own design.
No per-sim fees, no premium challenges, no "buy credits to enter this contest."
Yes. The fault models (stuck-at, transition, IDDQ, bridge) match the textbook definitions. Coverage numbers are real and reproducible. We round-trip patterns with commercial tools for verification — if our numbers don't match, we want to know.
Up to ~5,000 gates on the free Student plan, up to 50,000 gates on Pro. Larger designs work but performance varies by browser and machine. We are honest about these limits; we don't fake larger numbers.
Yes. Drop in a synthesized Verilog netlist (.v) and the simulator parses it. The free plan supports up to 1,000-gate designs; Pro supports up to 50,000 gates.
Yes — every row is a real student who completed the challenge. We use anonymous IDs (student-7af2) by default; nobody's real name is shown unless they opt in. There are no seed accounts and no fake ranks to fill the chart.
Through our education partner — a one-time check using your school email or enrollment document. The free plan renews automatically as long as you're a student.
Honest prizes, honestly listed. Mostly swag (lab notebooks, a textbook stipend, an oscilloscope sponsorship for the top-three's school). The point is the rank, not the merch — and we never inflate the prize list to make a banner look bigger.
Free for students. Free to try for everyone else. No install, no license server, no fake numbers.