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BUILD SYSTEMS THAT HANDLES SCALE AT ANY LEVEL

Test your System Architecture.
Design. Simulate. Fix. Repeat.

See how your design behaves under real load. Find bottlenecks, latency spikes, and breaking points before interviews.

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No setup. Run your first simulation in seconds.

prism, system design simulator LIVE
THE PRISM FRAMEWORK

How senior engineers
evaluate system design.

PRISM scores your design across 5 dimensions, the same rubric used in real FAANG interview loops.

P
Problem UnderstandingDid you clarify scope, scale, and constraints before drawing anything?
R
Requirement AnalysisDid you capture functional and non functional requirements?
I
Identification of ComponentsDid you identify the right services, boundaries, and data flows?
S
System ArchitectureIs the design coherent, scalable, and resilient under realistic load?
M
Mitigations & TradeoffsCan you defend your decisions and reason through alternatives?
WHAT PRISM DETECTS

Systems will never fail in theory.
They will fail under load

PRISM simulates real consequences. Every design decision has a cost, PRISM shows you exactly what it is.

Single Point of Failure

No redundancy. One node goes down, the whole system does.

100% downtime risk

Database Saturation

Write throughput exceeded. Queries queue faster than they drain.

P99 > 2,000ms

Queue Overload

Consumers can't keep up. Backpressure cascades upstream.

Depth: unbounded

Latency Spike

One slow dependency drags down your entire response time distribution.

Tail latency +800ms

Replica Lag

Primary/replica gap grows under write load. Reads return stale data.

Lag: 4.2s behind

Throughput Collapse

Circuit breaker trips. Requests rejected at the edge. System unavailable.

0 rps accepted
WHAT PROCESS PRISM FOLLOWS

Design. Simulate. Score.
Stop Guessing. Start simulating.

01

Design your system

Drag real components onto the blank canvas. Connect them together. Build what you'd design in the interview.

02

Run live simulation

Let components interact with each other. Watch traffic flow. Analyze performance. See bottlenecks emerge. Find where it fails. Fix issues in real time.

03

Get your score

Receive a detailed evaluation of your system design. Work on the feedback on design quality. Find if your system is Interview ready or not.

Start Free Evaluation
STRUCTURED LEARNING

Follow a proven path.
5 phases to mastery.

Skip the random YouTube tutorials. Our System Design Roadmap takes you from fundamentals to production-ready systems in a structured 5-phase learning journey.

Each phase builds on the last: understand the building blocks, learn how systems work, handle scale, manage distributed data, and master production concerns.

Learn Concepts

Read clear explanations paired with interactive diagrams.

Apply Immediately

Build architectures using each concept while learning.

Test Your Design

Simulate traffic and find what breaks under load.

Start the Roadmap

20+ concepts. 40+ interview questions. ~25 hours to mastery.

HOW IS PRISM BETTER

PRISM offers.
What actually matters.

Feature Others PRISM
Learn concepts Passive videos Build while learning
Test your design No validation Live design validation
Simulate traffic Not possible Real load simulation
Show failures Theoretical only Actual bottlenecks
Feedback Delayed, subjective Instant, data backed
Confidence Guesswork Measurable readiness
WHAT IS PRISM IDEOLOGY

Tradeoffs matters.
PRISM tells you why

Every design decision has a consequence at scale. PRISM doesn't just score your system, it shows which decisions hurt you and exactly what they cost.

  • Scalability vs. simplicity
  • Consistency vs. availability
  • Latency vs. throughput
  • Cost vs. reliability
  • Sync vs. async processing
See your tradeoff score →
Tradeoff Analysis AI Evaluation
Decision under review
"You chose synchronous DB writes without a write through cache."
Consequence at 50k RPS
Write latency
1,240ms
DB queue depth
12,400
Error rate
4.2%
Consider async writes via write behind cache to decouple DB pressure.
Engineers from these companies train with PRISM
START NOW

Your system is only as strong
as its weakest node.

Find it. Fix it. Think in systems.

Run your first simulation Take the full evaluation

Free to start. 5 simulations/month on the free plan.