ChaosBench

Visualize. Design. Defend.

Design Your System Architecture
With an AI That Argues Back.

The definitive system design interview simulator for engineers at every level — Mid, Senior, and Principal.

Drag and drop your architecture onto a real interactive canvas, then stress-test it before you write a single line of code.

Try Story Mode (3 min)

Free to try the whole simulator— sign in only when you want your grade

New to system design? We explain jargon in plain language as you go.

How it works

One session, four stages — the same loop a real interview runs.

Step 1

Clarify

The board stays locked until you've asked the right questions and uncovered the requirements no one told you about.

Step 2

Architect

Drag, drop, and connect real components on an interactive canvas — no diagramming tool, no slides.

Step 3

Chaos

A live, scenario-specific incident fires mid-build. Your architecture either absorbs it or it doesn't — no partial credit.

Step 4

Defend

A Staff Engineer cross-examines your specific tradeoffs, then scores you on Scalability, Resilience, and Cost.

ChaosBench mid-incident: the AI cross-examines a specific architecture bottleneck during a live P0 chaos incident
A live incident fires mid-build, and the AI cross-examines your specific bottleneck — not a generic hint.
ChaosBench final scorecard showing per-dimension scores for Scalability, Resilience, and Cost, plus a named biggest bottleneck
Your final grade, broken down by dimension — with the single biggest bottleneck named outright.

Not another answer key to memorize

A fixed answer key you read and memorize.

An AI that pressure-tests your specific design and argues back.

Graded on whether you finished, not how you reasoned.

Scored per-dimension — Scalability, Resilience, Cost — with a named bottleneck.

A mock interview: expensive, scheduled, one shot.

Retry any scenario, any time, as many times as your plan allows.

Built to bring you back

Keep your streak alive

A visible daily streak that tracks how consistently you practice.

Watch your Career Score climb

Every graded session feeds a running score across your whole history.

Challenge a friend

Send them the same scenario and compare scores when they're done.

ChaosBench's Career Score ring and daily streak counter, shown on the dashboard
Every graded session updates this — right on your dashboard.

Pricing

Free to start. ₹499/mo to go all in.

Every plan gets the full interview loop — clarify, architect, defend. Pro adds Principal-tier scenarios, Chaos Roulette, and 15x the monthly sessions.

Free

₹0

  • 2 sessions / month
  • Mid & Senior scenarios
  • Curated tracks, Story Mode & custom prompts

Pro

Monthly₹499/mo(~$6)
Season PassBest for active prep₹1,199/3 months(~$14)
Yearly₹3,999/yr(~$48)
  • Everything in Free
  • 30 sessions / month
  • Principal-tier scenarios
  • Chaos Roulette