BetaCompletely free during beta

Stop guessing.
See your code
execute.

LearnBug lets you run your own Python code step-by-step and watch exactly what happens — variables, memory, and logic visualised in real time. Not someone else's template. Yours.

Start Free — Sign Up Now▶  See how it works
✓ 100% free in beta
✓ Any Python code
✓ No setup needed
✦ The actual product — not a mockup
learnbug.in/debug
LearnBug visual debugger — Memory, Structure, Timeline and Learn views
📊 Memory view·🌿 Structure view·⏱ Timeline·🎓 Learn mode
Factorial → visualized
Binary Search → step by step
Merge Sort → see it split
Recursion → finally clicks
Two Sum → O(n) made clear
Tree Traversal → watch every node
Stack → LIFO visualised
DP Memoization → no more guessing
Your own code → finally makes sense
Factorial → visualized
Binary Search → step by step
Merge Sort → see it split
Recursion → finally clicks
Two Sum → O(n) made clear
Tree Traversal → watch every node
Stack → LIFO visualised
DP Memoization → no more guessing
Your own code → finally makes sense
3×
Faster debugging for new users
70%
Better concept clarity reported
95%
Learning retention improvement
100%
Free during beta — no catch
How It Works

From writing code to
truly understanding it

Three steps. No setup. No templates. Just your code, fully visible.

1
Write or paste your code

Any Python code — yours

Paste your own solution or write from scratch. No forced templates, no locked examples. LearnBug visualises any Python code you throw at it — including code with bugs.

2
Run it step by step

Watch every line execute

See variables update, the call stack grow and unwind, loops iterate, and memory change — all in real time, one step at a time. You control the pace.

3
Learn from what you see

Mistakes become lessons

When your code breaks, LearnBug shows you exactly where and why — visually. No cryptic errors. No guessing. You see the exact line, the exact state, and what went wrong.

LearnBug memory and stack visualization

Memory & Stack View

Watch data structures build in real time as your code runs

LearnBug code trace visualizer

Code Trace Visualizer

See every loop iteration and branch decision mapped visually

LearnBug problem mode with Two Sum

Problem + Learn Mode

Curated problems with AI insights, hints, and recommended resources

Languages
Python — Live now
JavaScript Coming soon
Java Coming soon
C++ Coming soon
The Real Problem

Other platforms show code.
We show execution.

Most tools give you a fixed set of problems and someone else's code to copy. LearnBug is different — you write your own code, make your own mistakes, and see exactly what happens.

🔒

Locked templates everywhere

Other platforms force you to use preset code examples. You can only visualise what they let you visualise — not your own code.

🌀

IDE debuggers hide the state

Even VS Code's debugger doesn't clearly show you what's happening to variables and memory as a visual — you have to read it, not see it.

💡

Mistakes are the best teacher

In LearnBug, broken code isn't an error — it's a lesson. See exactly where execution went wrong and learn by fixing it yourself.

Other tools
LearnBug ✦
Fixed, preset code only
✓ Any Python code you write
Errors = dead end
✓ Errors = visual lesson
Read state from text
✓ See state as a visual
Guess what broke
✓ See exactly where & why
Memorise patterns
✓ Understand deeply
Someone else's solution
✓ Your code, your learning
Features

Built for understanding,
not just solving

Every feature exists to give you complete visibility into your code.

⚡

Step-by-Step Execution

Run any Python code one line at a time. See where variables change, loops branch, and logic diverges from what you intended.

→ Never mentally simulate again
🧠

AI Error Explainer

When your code breaks, AI explains exactly why — in plain English. No cryptic stack traces. No guessing. Just a clear explanation of what went wrong.

→ Mistakes become lessons
📦

Memory Visualization

Watch variables, arrays, and data structures update in real time as execution moves through each line of your program.

→ See state, not just output
🔁

Call Stack Viewer

Recursion finally makes sense. Watch function calls stack and unwind visually — no mental gymnastics required.

→ Recursion clicks instantly
📋

DSA Problem Library

Curated library of algorithms — sorting, trees, graphs, DP — with visual breakdowns. Understand the intuition, not just the answer.

→ Learn from real patterns
🎯

Code Trace Visualizer

See the full execution trace mapped as a flow — every branch, every loop iteration, every function call — in a single visual structure.

→ Understand the full picture
Who It's For

Built for every stage
of the journey

🎓

Students & Beginners

Programming concepts finally "click" when you watch them execute. No more staring at code wondering what's actually happening.

✓ Zero experience needed
💻

Junior Developers

Debug faster and build confidence in your own code. See exactly where your logic diverges from what you intended — and fix it yourself.

✓ Your code, not templates
🏆

Interview Preparation

Understand DSA algorithms instead of memorizing them. Write your approach, watch it execute, and build real intuition that holds up in interviews.

✓ FAANG-ready understanding
📚

Educators & Bootcamps

Teach code in a way students actually grasp. Visual execution makes abstract concepts concrete — perfect for classrooms and live sessions.

✓ Institute plans available
Testimonials

The "aha" moment is real

Most users experience this in their very first session.

★★★★★

"I've been struggling with recursion for 3 months. One session with LearnBug and I finally get it. Watching the call stack build and unwind was the missing piece."

CV
Chandrasekar V.
SDE 2,Oracale
★★★★★

"I was prepping for Amazon and kept failing DSA rounds. The visual debugger made me understand binary search at a depth no tutorial ever gave me. Cracked it."

NC
Naidu C.
SDE 2, Amazon
★★★★★

"I use this in my Python bootcamp. The visualizer replaced 20 minutes of whiteboard drawing. Students understand in two minutes what used to take an entire lesson."

AA
Asra A.
MCT
"Oh. THAT'S why my code breaks."

The most common thing people say after their first LearnBug session.

Access

Free for everyone.
Tailored for institutes.

We're in beta — which means every individual gets full access, completely free. Institutes and bootcamps get something extra.

🧑‍💻

Individual Users

Students, developers, and self-learners get full access to LearnBug during beta — completely free, no card, no catch.

  • ✓ Step-by-step code execution
  • ✓ Memory & call stack visualization
  • ✓ AI error explanations
  • ✓ Full DSA problem library
  • ✓ Code trace visualizer
  • ✓ Paste any Python code — no templates
  • ✓ No credit card, no time limit
Start Free — Sign Up Now

Beta access · 100% free · No commitment

🏫

Institutes & Bootcamps

Want to use LearnBug for your classroom, bootcamp, or organisation? We offer a dedicated dashboard, progress tracking, and instructor tools — reach out to us.

  • ✓ Everything in Individual
  • ✓ Institute-wide dashboard
  • ✓ Student progress tracking
  • ✓ Instructor management tools
  • ✓ Custom problem sets for your syllabus
  • ✓ Private environments for your students
  • ✓ Dedicated support & onboarding
Contact Us → learnbug.support@gmail.com

Custom pricing · Built around your needs

FAQ

Everything you need to know

LearnBug is a visual code debugger that shows you exactly what happens when your code runs — line by line. You paste or write your own Python code, hit Step, and watch variables change, the call stack build, and logic branch in real time. AI explains errors and logic issues in plain English at every step.
You can use any Python code you write — that's the whole point. Most platforms force you to use fixed templates where you can only visualise pre-approved code. LearnBug visualises whatever you paste in, including code with bugs. Your learning, your code, your mistakes.
This is where LearnBug is most powerful. When your code breaks, LearnBug shows you exactly where execution stopped, what the state of every variable was at that moment, and explains what went wrong — visually. Mistakes aren't dead ends here, they're lessons. You fix it yourself and understand why.
During our beta period, LearnBug is completely free for all individual users — no credit card, no trial period, no hidden limits. We're focused on building the best possible product right now. When we launch paid plans in the future, we'll give plenty of notice and the core experience will remain accessible.
Absolutely — and this is one of the best use cases. Write your own approach to a problem, run it, and watch exactly what your code does at each step. You build real understanding of why an algorithm works, not just muscle memory of the pattern. That understanding is what holds up under interview pressure.
Python is fully supported right now, covering all the DSA fundamentals — arrays, recursion, trees, graphs, dynamic programming, and more. JavaScript, Java, and C++ are actively being worked on. The visualisation engine is language-agnostic, so expansion is coming faster than you'd expect.
Reach out to us directly at learnbug.support@gmail.com with your institute name and what you're looking for. We offer a dedicated dashboard, student progress tracking, instructor tools, and custom problem sets built around your syllabus. We'll get back to you within 24 hours.

Make mistakes.
Learn from every one.

LearnBug doesn't punish broken code — it visualises it. Start understanding your code, not just running it.

Start Free — Sign Up NowFor institutes →

100% free during beta · No credit card · Any Python code · Sign in to access the full playground