Stack frames
Peel call frames open.
See saved registers, local slots, and return addresses stack into a frame — not a list of mystery offsets.
Free for Georgia Tech students
Interactive RISC-V Simulator
built for
understanding
StudyRISC-V gives you step-by-step execution, register inspection, and visual learning in one calm workspace. Trace assembly, watch the stack grow, and finally see what the CPU is actually doing.
342
Regression tests
20
Lessons
15
Problems
RV32IM
Core ISA
Georgia Tech friendly
Runs in your browser
RV32IM step execution
20 lessons + checkpoints
15 coding problems
Architecture learning should feel like inspecting a live system.
StudyRISC-V keeps code, machine state, and conceptual visuals in one calm workspace. Every stack adjustment, memory access, and control-flow change has a visible place on screen.
What is a RISC-V simulator?
A RISC-V simulator shows how code changes registers, memory, and control flow.
A RISC-V simulator emulates the machine so you can assemble a program, execute one instruction at a time, and inspect state without needing physical hardware. The best simulators do more than run code. They expose the stack, registers, memory, and branches so you can see why the machine behaves the way it does.
StudyRISC-V is an interactive RISC-V simulator built for visual learning. It combines step-by-step execution, register inspection, opcode explanations, and architecture visuals so the machine stays visible while you learn.
Three places where the machine stops feeling abstract.
Pipeline flow
Trace an instruction through the datapath.
IF, ID, EX, MEM, WB stop being five letters on a slide and start reading like concrete machine stages.
Branch prediction
Watch one path win.
A prediction tree is easier to trust once you can see it fan out, commit to a branch, and retract on a miss.
01
Understand the stack before you debug it.
Saved registers, local variables, and return addresses become readable when you can see the frame grow from the top of memory. Offsets stop being arbitrary.
Open the simulator →
sp → 0x7fffffec
0x7ffffffc
saved ra
0x00000148
0x7ffffff8
saved s0
0x10000020
0x7ffffff4
local temp
12
0x7ffffff0
arg spill
x11
02
Step through execution, not just outputs.
The goal is not to reach final register values faster. It is to see every machine transition and catch the moment your mental model diverges from reality.
Try step execution →
PC 0x20
addi x5, x0, 5
Seed loop counter
PC 0x24
lw x6, 0(x2)
Load next element
PC 0x28
add x10, x10, x6
Accumulate sum
PC 0x2c
bne x5, x0, loop
Branch or continue
03
Practice on real problems, in the same workflow.
Lessons, checkpoints, and LeetCode-style problems are part of one product surface. Practice feels like a continuation of the simulator, not a separate tool.
Browse problems →Sum an array into x10.
- Read each word with
lw - Loop with a counter, stop at the provided length
- Return the total in
x10
Visible test 1
Passed
Visible test 2
Passed
Hidden edge cases
3 queued
04
See branching and pipeline rhythm together.
Branches are hard because control flow is invisible in most tools. StudyRISC-V keeps the active stage, the prediction, and the winning path legible at the same time.
Explore the simulator →IF
ID
EX
MEM
WB
Fallthrough
Loop target
Return path
bne x5, x0, loop
→ branch taken
One workspace. Several ways to learn.
Simulator, lessons, problems, quizzes, and architecture visuals stay connected so learning feels progressive, not fragmented.
Step. Inspect. Understand.
Execute one instruction at a time. Watch every register change, every memory write, every PC jump.
Assembly in plain English.
Every instruction translates to a C-like expression. addi x1, x2, 10 becomes x1 = x2 + 10.
Live stack visualization.
Watch the call stack build frame by frame. See ra saved, sp move, calling conventions made concrete.
20 structured lessons.
From binary arithmetic to function calls. Checkpoints gate progression so you build real understanding.
15 coding problems.
LeetCode-style, RISC-V edition. Write real assembly, run it against test cases from Easy to Hard.
Try a problem →No install. Open a tab.
The simulator core is compiled to WebAssembly. Browser-native, near-native speed. Start in seconds.
342
Regression tests across the simulator and learning flow
20
Lessons moving from machine basics to function calls
15
Coding problems, Easy through Hard
RV32IM
Browser-based core with registers, memory, and step execution
Explore the RV32IM instruction set.
Hover any opcode to see what it does, what it changes, and why it matters.
ADDI
Add an immediate constant to a register.
addi x5, x0, 10
Immediate setup for constants and loop counters
Use addi for quick register updates without touching memory. It shows up everywhere: loop indexes, stack pointer movement, and small constant setup.
x5 ← x0 + 10
RV32IM
Ready to actually understand RISC-V?
No install. No account required. Open the simulator and start executing assembly in seconds.