AI system design interview assistant
System design interviews are conversational and visual at the same time. Co-Help listens to the discussion and can render diagrams or read the ones already on screen — all from a private, invisible overlay.
How Co-Help helps with system design interviews
Co-Help transcribes the system design discussion live, so it has context as requirements, scale numbers, and trade-offs come up. When you need to reason through an architecture out loud, its 9 AI models race in parallel to suggest components, trade-offs, or missing pieces. Co-Help can also render architecture and flow diagrams and read diagrams already on your screen through screenshot Q&A — useful when a whiteboard tool or shared doc shows a system you need to reason about quickly.
Built for the format
- Diagram rendering — get an architecture or flow diagram sketched out based on the discussion.
- Screenshot Q&A on existing diagrams — capture a whiteboard or doc and get an explanation of what's shown.
- Live transcription — keeps track of requirements and constraints as the interviewer states them.
- Invisible on screen share — stays hidden even while a whiteboard tool or diagram is the shared window.
Pricing for every interview type
The same three plans cover every interview type — there's no separate add-on for coding, system design, or behavioral support:
- $20 one-time session — every feature, one full interview, no subscription.
- $150/month (40% off the regular $250) — unlimited sessions.
- $600/year (40% off the regular $1,000, about $50/month) — unlimited sessions, best value.
Every plan includes all 9 AI models, live transcription, screenshot Q&A, diagram rendering, your knowledge base, and the invisible overlay — with no API keys to manage.
Works on the platform you're interviewing on
Co-Help runs as a desktop overlay, independent of whichever video call tool your interview uses. It's invisible on screen share for Zoom, Microsoft Teams, and Google Meet alike, on both Windows and Mac.
Rules vary by employer and assessment platform. Some companies and technical-screen platforms explicitly restrict outside tools. Check the rules for your specific interview before using any AI assistant, including Co-Help.
Other interview scenarios Co-Help covers
Zoom interview assistant
Stay invisible while screen sharing on Zoom.
Microsoft Teams interview assistant
Live help on Teams calls and interviews.
Google Meet interview assistant
Works alongside Meet in the browser or app.
Coding interview assistant
Screenshot Q&A for live coding rounds.
Mac interview assistant
macOS 11+, Apple Silicon and Intel.
Frequently asked questions
Does Co-Help work for system design interviews specifically?
Yes. Co-Help includes diagram rendering and screenshot Q&A for architecture and flow diagrams, plus live transcription of the discussion — built to support system design interviews alongside coding and behavioral rounds.
Can Co-Help read a diagram I'm already looking at?
Yes, through screenshot Q&A. Capture what's on your screen — a whiteboard, a shared doc, or your own sketch — and Co-Help's AI models analyze it and respond on your private overlay.
Will Co-Help's overlay show up if I share a whiteboard tool during a system design interview?
No. The overlay uses screen-capture protection and a click-through window, so it stays invisible to whatever you share, including a whiteboard tool, diagramming app, or shared document.
Walk into your next system design interview prepared
Get Co-Help for $20 per session, or start with a free demo to see the overlay in action.
Or explore the full comparison hub.