Design your system.
Simulate it.
See where it breaks.

Like a flight simulator for system design. Build visually, run real traffic through it, and find the bottlenecks before they find you.

Try a live simulation

Free to use. Desktop only (for now!).

Add a component. Rewire the flow. See what changes.

Design decisions have consequences. Watch them play out in real time.

Design anything

7 universal blocks that model any domain. Backends, kitchens, hospitals, factories. No infrastructure jargon required.

✓Drag, drop, and wire components
✓12 behavior modes (queues, retry, circuit breakers...)
✓Start from 16 templates or a blank canvas

See it break

Deterministic simulation runs traffic through your design. Watch queues fill, requests drop, and bottlenecks form.

✓Animated request flow with live stats
✓Scrub the timeline to inspect any moment
✓Stress test with traffic spikes and outages

Your AI design partner

Chinilla AI teaches you while you build. It reads your simulation, explains what went wrong, and walks you through the fix. It proposes, you decide.

✓Paste code, papers, or specs and get a visual diagram
✓AI-generated PRD spec sheets from your design
✓Explains the why, not just the what

Paste your code. Get a living diagram.

Drop in a Python script, a YAML config, or any source file. Chinilla AI reads your code, extracts the architecture, and builds an interactive diagram you can simulate right away.

✓ Paste, drag and drop, or upload any code file (up to 100KB)

✓ Supports 15+ languages plus YAML, JSON, TOML, and XML configs

✓ Auto-detects services, queues, databases, and connections

✓ Edit the generated design, then simulate it to find the gaps

Best with single files or focused modules. For large codebases, paste the core file.

Have a research paper or spec instead? Upload it to Chinilla AI and describe what you want to design.

Export anything. Use it anywhere.

Your designs aren't trapped in a tab. Export a PNG for your GitHub README, an SVG for crisp docs, an animated GIF that shows your system running, or grab the Python code to keep building outside Chinilla.

✓ PNG, SVG, and GIF for docs, READMEs, and presentations

✓ Python and Mermaid for code-level integration

✓ Full project backup to pick up where you left off

✓ Publish a live link anyone can explore

Free tier covers the core experience. See what Pro adds →

Built for system design interviews.

Load a real interview problem, run the simulation, and see if your design holds. Each template is fully wired with realistic metrics, behaviors, and costs.

✓ URL shortener, chat app, rate limiter, CDN, and more

✓ Step-by-step lessons that teach by building

✓ AI critiques your design and teaches you patterns

✓ Stress test with traffic spikes and outages

✓ Earn badges and completion certificates

✓ 8 classic problems, 16 templates total

Design it. Simulate it. Understand it.

Free to start. No credit card required.