Question 1

What is Logicode?

Accepted Answer

Logicode is a LeetCode-style platform for Verilog and hardware design. You solve RTL problems in SystemVerilog or VHDL in a browser editor, simulate against a reference testbench, and synthesize your design to real area and timing numbers. It is built for FPGA, ASIC and RTL design interview prep.

Question 2

Do I need to install anything?

Accepted Answer

No. You write code in the browser and we run the simulator and synthesizer for you. There is no toolchain, PDK or license to set up.

Question 3

How is my solution checked?

Accepted Answer

A testbench drives the same inputs into your design and our reference, then compares the outputs cycle by cycle. Every run comes back with a waveform, passing or failing, with the reference signals next to yours.

Question 4

How does the ranking work?

Accepted Answer

Every accepted design is synthesized, and its area and maximum frequency are compared with every other engineer's on that problem. Your best area and best timing count separately, so you can chase each one. The leaderboard score adds points per problem by difficulty, half for solving it and half for how your results rank.

Question 5

Which tools do you use?

Accepted Answer

Simulation runs on Verilator. Synthesis runs on Yosys against the open SkyWater Sky130 PDK. Waveforms open in Surfer.

Question 6

Can I use VHDL?

Accepted Answer

Yes. Pick SystemVerilog or VHDL in the editor. Both are judged and ranked the same way.

Question 7

How is this different from HDLBits?

Accepted Answer

HDLBits is great for learning the language and stops at functional correctness. Logicode takes a passing design through synthesis, so you also learn what it costs in area and timing and can compete on it.

Question 8

Is it free?

Accepted Answer

A core set of problems is free. Premium adds the full problem catalogue and optimized solutions. See the pricing page for current tiers.

Fibonacci Generator