Think Like an Architect.
ArchitectOS scores your system design against a public, versioned rulebook — no LLM decides your grade. Build in the Sandbox, break it in Chaos, and see exactly which rule earned or cost you every point.
Scored, not just simulated
Not another documentation site. Not another AI opinion. A deterministic score, with the rule that earned every point.
Deterministic Scoring
Every score traces to a public, versioned rule — not a model's opinion.
AI Architect
Work with an AI mentor that challenges every design decision.
Real Failure Injection
Kill services, drop regions, and watch exactly what breaks — before production does.
Ten real systems to design and break
Every simulation drops you into a real engineering scenario, with a live system reacting to your decisions.
Design Twitter Timeline
Build a feed that scales to millions of fan-outs without melting your write path.
Scale PostgreSQL
Take a single-node database from first index to a sharded, replicated cluster.
Database Query Planner
A visual EXPLAIN ANALYZE simulator for reading query plans like an expert.
Distributed Cache Simulator
Tune eviction policies and TTLs while watching hit ratio move in real time.
Load Balancer Playground
Compare routing algorithms under bursty, uneven traffic in real time.
API Gateway Simulator
Wire up auth, rate limits, routing and caching in front of live traffic.
Microservice Failure Lab
Kill services on purpose and design retries, circuit breakers and fallbacks.
Message Queue Explorer
Kafka vs RabbitMQ — ordering guarantees, consumer groups and DLQs, side by side.
System Design Interview
An AI interviewer, a live whiteboard, and real-time feedback on your tradeoffs.
Cloud Cost Simulator
Scale from 100 to 10M users and watch your infrastructure bill react.
It never gives you the answer
The AI Architect asks the questions a staff engineer would ask in review — until your design can defend itself. No answers handed over. Only pressure, applied in the right places.
- Challenges every tradeoff before you ship it
- Pushes on scale, cost, and failure modes
- Adapts follow-ups to the design you actually drew
Postgres primary
Single writer, 3 read replicas added
The score, not just an opinion
Every architecture gets scored on Cost, Simplicity, and Availability — by a rule engine, not a language model. Every point traces to one versioned rule you can read yourself.
- Zero LLM calls decide your score — same design, same result, always
- Every point cites the exact rule that earned or cost it
- The whole ruleset is public — read it yourself
Availability
2 risks found across 2 components.
Toggle a service. Watch the path light up.
A fixed reference topology, not the canvas — switch pieces on and off to see which paths survive. Building your own, with real properties and a scored design, happens in the Architecture Sandbox.
Tap a service above to add it to the canvas.
One path, fundamentals to interviews
Seven stages. Each one unlocks the simulations and labs that build on it.
Foundations
Data structures, algorithms, and how computers actually work.
Databases
Indexes, transactions, replication, and query performance.
Networking
HTTP, TCP/IP, DNS, and how services actually talk to each other.
Distributed Systems
Consensus, partitioning, and treating failure as a first-class citizen.
Cloud
Compute, storage, and managed infrastructure at real-world scale.
System Design
Turn ambiguous requirements into architecture that holds up.
Architecture Interviews
Whiteboard practice against an interviewer that pushes back.
Compete for free. Pay for the co-pilot.
Scoring, challenges, leaderboards and Battle are unlimited on every plan — that's the part of ArchitectOS you never have to pay for, and capping it would starve the corpus the whole rulebook is calibrated against. The AI Architect is the paid part, because it's the one thing with a real bill behind every use.
Free
The whole competitive product, uncapped — you can compete, get scored and climb leaderboards forever without paying. What you get a taste of, rather than a working allowance, is the AI.
- Unlimited deterministic scoring, fully traced
- Unlimited Weekly Challenge entries and leaderboards
- Unlimited Battle, Chaos experiments and Labs
- Unlimited Sandbox designs and saved versions
- 3 AI Architect requests per month — enough to see what it does
- Trust Layer API in preview — no key required
Pro
The AI Architect as an everyday tool instead of a demo. Everything deterministic is already unlimited on Free and stays that way — the upgrade is the assistant, not the scoreboard.
- 500 AI Architect requests per month
- AI review on every design, not just your first few
- Chaos blast-radius explained in plain language, every run
- Everything in Free, unchanged
- Portfolio export of your scored designsplanned
- Priority when the API gains quotasplanned
$29/mo is the intended price, not a live one — there's no billing yet, so every account is on Free today. This card will grow a button when it can actually take payment.
Teams & review boards
Priced with the first design partners rather than guessed at now. A number we can't accept payment for is a stronger claim than a vague feature list.
- Shared team workspaces and pooled AI budgetplanned
- Architecture Review Board integrationplanned
- Gating in CI, once the rules have earned itplanned
- SSO and an audit trailplanned
Nothing to click yet — there's no way to buy this, and pretending otherwise is the thing this page stopped doing.
There is no billing yet, so every account is on Free today and no button on this page will try to charge you. The AI limit is enforced server-side per calendar month; a request that fails never counts against it. The deterministic Trust Layer API (POST /api/score) stays open and keyless in preview on every plan — selling that to companies, not metering your practice, is where this is meant to make money.