Real-time collaboration
Interviewer and candidate draw at once, with live cursors and presence, like a physical whiteboard but remote.
System design interviews
Design systems. Weigh trade-offs. Pass the round.
The collaborative whiteboard for system design interviews: place load balancers, services, queues and caches on an infinite canvas, live, and share a link your candidate joins with zero signup.
No install · No signup for guests · Export to PNG, JPG, PDF
Architecture-native shapes
Service and database nodes, reactive arrows that clip to borders and a hand-drawn feel for sketching fast.
Zero friction to start
Share a link and the guest joins without signing up. Nothing to install and it runs in the browser during your call.
A recommended flow
From an empty link to a finished design
A system design round is not about running code: it is about explaining how components connect, where the bottlenecks are and which trade-offs you make.
1. Share the link
in seconds
Open a session and send the link to the candidate or your practice partner.
2. Scope the requirements
before you draw
Note assumptions, scale and goals on the canvas before drawing the architecture.
3. Design live
together
Connect components, label protocols and reason about trade-offs while you draw at once.
4. Review and export
for feedback
Use history to revisit how the design evolved and export an image or PDF.
What you can draw in the round
High-level diagrams: clients, API gateway, services and storage.
Load balancing, replicas, sharding and caching strategies.
Message queues, workers and asynchronous flows between services.
Data models, indexes and consistency decisions.
Failure points, scaling limits and the trade-offs of your solution.
Frequently asked questions
Is it free, and do I need an account?
Yes, it's free. Joining a session and drawing need no account and nothing to install, so your candidate is in with a single link. A free account is only for keeping your own diagrams, since your library and version history sync once you're signed in.
How does my candidate join?
Share the session link or its QR code. They enter a name and start drawing in seconds, with no signup and nothing to install. It runs right in the browser during your video call.
Does it run code or grade the solution?
No. Diagraw is the visual half of system design: drawing the architecture, connecting components and explaining trade-offs. It doesn't execute code or grade solutions, so it's ideal for the design conversation.
Is it really real-time, and how many people can join?
Real collaboration over a live connection: everyone sees each other's cursors, presence and edits as they happen, and the host can present a view for others to follow. A session holds far more people than an interview needs, so 1:1s and panels both work.
What can I export or reuse afterwards?
Export the board as PNG, JPG or PDF for feedback, or as a Diagraw file to reopen later. You can also export the diagram as Mermaid or Docker Compose code, and import the same formats, or a Miro board, to start from something you already have.
Does the live link expire, and could I lose my diagram?
Live session links expire automatically after a while, and the host can end the session at any time. Either way your diagram stays on your canvas, so nothing is lost. Signed-in hosts also keep it in their library with full version history.
How are my account and data handled?
Sign in with Google, GitHub or email, with optional two-factor authentication. Passwords are stored hashed with Argon2id, never in plain text, and you can export or delete your account and diagrams whenever you want.
Can I use it to practice on my own?
Yes. Rehearse design rounds solo or with a partner, save named versions as your architecture evolves, and reopen or duplicate a sketch before the real interview.
Get ready for your next system design interview
Whiteboard speed with what a remote team needs: live collaboration, history and share-by-link, free.