Concept Explainers
Watch the flows interviewers ask about come to life. 177 animated, step-through walkthroughs — HTTPS, Kubernetes, load balancing, RAG, CAP theorem, two-pointers — with auto-play, voice narration, an interactive "what if…?" remix, and on-demand custom generation.
Seven Tracks, 177 Flows
From the request that loads a web page to the pipeline behind a RAG system — the whole technical-interview surface, animated.
Software & System Design
AI / ML
DevOps
DSA & Coding Patterns
Cloud
Networking
Web & CS Basics
Move One Step at a Time — Until It Clicks
Take the HTTPS / TLS 1.3 handshake. Auto-play it once to see the shape, then step through each exchange yourself. The diagram highlights the active stage and the narration explains exactly what's happening — so you can explain it back in the room.
Not Just Watch — Interrogate the Flow
Real understanding comes from asking "what changes if…". So you can — and the diagram answers.
"What if…?" Remix
Pose a hypothetical and the explainer re-renders to show the consequence — stack changes on top of each other to explore a whole design space.
Generate On-Demand
The library has 177 flows — but if yours isn't there yet, describe it and get a fresh animated, step-through explainer built on the spot.
Learn It the Way It Actually Works
Motion makes systems memorable. Here's everything packed into each explainer.
Auto-Play or Step Through
Watch the whole flow animate end-to-end on auto-play, or drive it yourself one step at a time. Every stage pauses on the exact node so you can sit with it until it clicks.
Voice Narration
Turn on narration and each step is explained out loud as the packets travel — perfect for learning a system design flow on a commute or while you sketch along.
"What if…?" Interactive Remix
Ask a hypothetical and watch the diagram change. "What if we add a Redis cache?" "What if this node goes down?" "What if we double the traffic?" — the flow re-renders to show the answer.
Generate Any Concept On-Demand
Need something that isn't in the 177-explainer library yet? Describe it and a brand-new animated, step-through explainer is generated for you — tuned to the exact flow you're studying.
Real Diagrams, Not Slides
Every explainer is a live node-and-edge diagram with packets moving across it — so you see how requests, data, and control actually flow, the way an interviewer wants you to draw it.
Built for the Whiteboard Round
These are the exact flows interviewers ask you to explain — HTTPS, Kubernetes, load balancing, RAG, CAP theorem, two-pointers. Learn them as motion, then reproduce them under pressure.
Stop Memorising. Start Seeing.
You can read about load balancing a dozen times and still freeze when asked to draw it. Watching the packets move — then stepping through it, then remixing it — is what makes it stick.
Choose Your Plan
Unlock your full potential with AI-powered interview preparation. Monthly credits reset with your billing cycle.
Free Plan
Get started with basic features
Starter Pack
Perfect for beginners
Professional Pack
For serious candidates
Ultimate Pack
Best value for extensive practice
What's in the Interview-Prep Suite
Every paid plan includes the full toolkit — your monthly credits decide how much you use it, and resume downloads are unlimited on Pro and Ultimate.
| Feature | Starter | Pro | Ultimate |
|---|---|---|---|
| Monthly credits | 90 | 270 | 600 |
| AI Voice Mock Interviews | Included | Included | Included |
| Live Interview Copilot | Included | Included | Included |
| Job Search | Included | Included | Included |
| Company Insights | Included | Included | Included |
| Concept Explainers | Included | Included | Included |
| Resume Builder + ATS Score | Included | Included | Included |
| Resume downloads | 10 / month | Unlimited | Unlimited |
Mock Interviews, Live Copilot, Job Search, Company Insights and Concept Explainers all draw from your monthly credit allowance — higher plans simply include more credits. Resume downloads are 10/month on Starter and unlimited on Pro & Ultimate.
Need Extra Credits?
Purchase bonus credits that never expire - perfect for intensive preparation periods
See the Flow Before You Have to Draw It
177 animated, step-through explainers of the exact concepts interviewers ask about — auto-play, voice, "what if…?", and custom generation.