See inside the machine. Understand how computers really work.
Launch SimulatorEvery time you run a program, billions of operations happen inside your computer in fractions of a second. But what actually happens? How does a CPU read your code? How does a GPU process thousands of calculations in parallel?
This simulator strips away the abstraction. You'll write real assembly code and watch, step by step, as the CPU fetches instructions from memory, decodes them, executes operations, and writes results back. No magic. No mystery. Just the raw mechanics of computation.
Every instruction your computer runs goes through this fundamental cycle. Our simulator visualizes each phase so you can see exactly what's happening inside the processor.
CPUs and GPUs are both processors, but they're designed for very different workloads. Our simulator includes both so you can see and feel the difference.
Write real assembly instructions and see them execute in real-time.
Understand fetch, decode, execute, and writeback cycles.
See how GPUs process multiple data points simultaneously.
Watch data flow between registers, memory, and VRAM.
Visualize the ALU, control unit, and data buses.
Step through code line by line or micro-operation by micro-operation.
Whether you're a student learning computer architecture, a developer curious about what happens beneath your high-level code, or just someone who wants to understand how computers work, this simulator makes the invisible visible.
Start with the built-in examples, modify them, break them, and learn by doing. There's no better way to understand a system than to watch it run.