System design · AI pipelines · Security

Watch it break. Fix it by voice.

Build it. Push traffic. See what fails. Fix it and prove it with the same traffic.

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0components
0problems
Freeruns, findings and fixes
0welcome credits
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Requests/s0
p99 latency–
User experience–
Credits1,000
You
Jarvis

Every number measured.
Every fix proven.

Same traffic, same seed, before and after.

01 / 06

Assemble

Drop in components. Set response time, rate and capacity.

02 / 06

Push traffic

2,000 requests a second. Every dot is a simulated request.

03 / 06

Break it

Database at 9 s: slower than the timeout, retries triple the load, it crashes.

04 / 06

Fix it by voice

"Jarvis, fix it." Preview, price, apply, rerun.

05 / 06

Defend it

A 50,000 req/s flood. The edge stops it, layer by layer.

06 / 06

Price it

Monthly cost per component, from public price lists.

What's inside

A flight simulator for architecture

Components mimic real systems from the numbers you set. Any design, any scale, in your browser.

ENGINE

Per-request simulation

Queues fill, CPU climbs, retries amplify, nodes crash.

p50 / p99 · CPU · memory · queue · Apdex
JARVIS · COMING NEXT

Voice co-pilot

"Add a cache with a 90% hit rate." Every change previews first.

build · configure · fix · undo
INTERVIEW

AI interviewer

Asks about what just broke, from the numbers only.

correctness · performance · resilience · security · cost
AI PIPELINES

RAG and agents

Vector DB, embeddings, LLM quotas, time to first token.

TTFT · tokens/min · vector memory
SECURITY

OSI-aware defence

WAF, DDoS, mTLS, SIEM. Trust zones and blast radius.

block rate · MTTD · blast radius
COST

Real-world pricing

Monthly cost per component from cloud list prices.

per node · per 1,000 requests · dated
Component catalog

119 components, 162 problems, one price list

Traffic and compute 28

Load balancerAPI gatewayCDNApp serviceServerlessService meshCircuit breakerGraphQLgRPCAutoscaling

Data and messaging 23

CacheSQL databaseKey-value storeMessage queueEvent streamObject storageSearch indexOutbox / CDCStream processorWarehouse

AI pipeline 32

Semantic cacheEmbedding modelVector DBLLM endpointAI gatewayGuardrailsModel routerHybrid searchPrefill / decode poolsKV cache tierSpeculative decodingMulti-LoRAGraphRAG

Agents 22

Agent orchestratorMCP toolsCode sandboxHuman approvalAgent memoryA2A agentsSpend governorAgent harnessSubagentsComputer useCheckpoints

Security 14

DDoS protectionWAFBot managementmTLS proxyZero-trust proxySIEMFraud detection

Problems 162

Product catalogSlow database rescuePayment webhooksURL shortenerEvent pipelineRAG assistantEdge defenceAgent runawayYouTube end to endLLM gateway + fallbackMCP agentsDocument Q&A
Credits

No plans. Pay for what you place.

Every component has a price in credits. Commands and AI do too, and a run costs more as its traffic grows. Findings and fixes are free, and the price shows before every action.

START
$0
  • All 119 components
  • All 162 problems
  • 25 guest credits a day
  • 100 credits with sign-in
1,000 CREDITS
$10
  • About 150 components placed
  • Or 50 AI reviews
2,750 CREDITS
$25
  • 10% bonus credits
  • Credits never expire
6,000 CREDITS
$50
  • 20% bonus credits
  • Credits never expire
Place a component 3–12Copilot command 1Run to 5,000 req/s 0Each 5,000 req/s more 1Stress test 5AI answer 3AI review 20Findings and fixes 0
Start in one click

Break your first design today

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