Describe it.Watch it run.
An AI architecture diagram generator: describe a system or import a GitHub repo. Archreactor draws the system, then plays each request through it, step by step.
Free, no card. Share as a link, PNG, MP4, slides or a sequence diagram.
From a sentence to a running architecture diagram.
Follow one request through Archreactor itself. Scroll, and each part does its job when the request reaches it.
Decision
Prompt or repo?
External service, optional
Or connect a GitHub repo.
Gateway intake waiting
Say what you're building, in plain words.
What happens here
- Your description is read, or the repo's file list and key config files.
- Prompts that contain secrets (API keys, private keys, database passwords) are turned away before anything is stored.
- Private repos are read through your own GitHub connection.
Queue and worker diagram engine waiting
A clean, layered diagram in about a minute.
Grouped by layer, every connection labelled with what travels on it. Edit it on the canvas, or ask for changes in plain words.
A real diagram from the library: URL shortener, 22 components. Drag it, zoom it, fold a layer.
Service player waiting
Press play. Each step lights the part doing the work.
With the reason next to it, so anyone can follow, not only the person who built it.
Replicas exports waiting
One diagram, four ways to share it.
56 real system design examples. Pick one, watch it run.
Every one is a full diagram you can play, fold and open, from URL shorteners to payments and video streaming. Browse the library
Registry 56 systems
components · connections · steps
How a chat system holds millions of persistent connections, routes end-to-end encrypted messages, and falls back to push when users are offline.
This is a learning explainer based on public engineering writing and general design practice. It is simplified, it is not the actual architecture of any company, and it may be inaccurate.
Levels one diagram, three altitudes waiting
40 parts fold into 14.
Business, Solution and Technical are views of the same diagram, so they never drift apart. Scroll to zoom out; edit one part and every level changes with it.
Everything an engineer needs: every part and every connection.
Legend how every diagram is drawn waiting
Drawn the way an architect would.
Databases are cylinders
Caches, stores and buckets too, filled so data stands out at a glance.
Queues are pipes
Streams and topics read as what they are, with the line into them marked as async.
Third parties are dashed
Stripe, Twilio, an LLM provider: outside your system, so outside the solid line. Brand logos for 120+ products.
Lines say what travels
Solid request, dashed event, dotted data flow. Routed around boxes, never through them, and merged when they mean the same thing.
Layers fold
Platforms and layers become containers. Collapse what doesn't matter yet, open it in place when it does.
Edit by chatting
“Add a Redis cache in front of the database.” The diagram changes and the layout keeps up. Or edit it by hand.
Worker repo sync Coming
Diagrams that keep up with your repo.
When the code changes, the diagram follows, so the walkthrough you shared last month still describes the system you run today.
Rate card pricing waiting
Diagrams are free. AI is fair.
Draw and edit as many diagrams as you like on every plan. AI generation uses credits.
| Plan | Price | AI credits | For |
|---|---|---|---|
| Free | $0 forever | 25 AI credits / month | Try it for real, no card. |
| Starter | $10 / month | 100 AI credits / month | For one person who's outgrown the free credits. |
| Pro | $19 / month per editor | 300 AI credits / month | For presales, onboarding and real decisions. |
| Team | $49 / user / month, 3 seats min. | Pooled credits | For a whole team working on one set of diagrams. |
Now describe your own system.
Free to start, no card. Your first diagram takes about a minute.
Questions about architecture diagrams
What is an AI architecture diagram generator?
It turns a plain description of a system, or a codebase, into a software architecture diagram, so you edit a draft instead of drawing from nothing. Archreactor also plays each request through the diagram step by step.
How do I turn a GitHub repository into an architecture diagram?
Connect the repo, pick it, and Archreactor reads the code and draws the components and how they connect. You can then edit the diagram like any other, and re-import when the repo changes.
Can I create an architecture diagram from a text description?
Yes. Say what you are building in plain words, for example a ride-hailing app with payments and notifications, and you get a layered diagram in about a minute.
Is it free?
Yes, you can start free with no card. Diagrams are free to make and edit; AI generation has fair-use limits, and the pricing page lists what each plan includes.
What can I export?
Share a link, or export PNG, MP4 or PowerPoint slides. The animated walkthrough exports as video, and as a UML sequence diagram you can download as PNG or SVG or copy as Mermaid or PlantUML.
Can I get a sequence diagram from my architecture diagram?
Yes. Every walkthrough becomes a UML sequence diagram: one lane per component or per layer, one numbered arrow per step, with each step's explanation as an optional note. Download it as PNG or SVG, or copy it as Mermaid or PlantUML. Every System Design Library page shows one.
What are the Business, Solution and Technical views?
They are three levels of the same diagram. Business shows the big blocks for stakeholders, Technical shows every service and store for engineers, and editing one level updates the others.
Where can I see examples of system design diagrams?
The System Design Library has full diagrams of well-known systems, such as a URL shortener, WhatsApp and a ride-hailing app. Each one plays and opens in the editor.