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PrepGrind
Learn system design, DSA & AI by building, not memorizing
PrepGrind is a interactive playground to learn system design and data structures, algorithms (DSA) & AI. Build architecture diagrams on a drag-and-drop canvas, run live traffic simulations, study 33 real system design case studies (URL shortener, Instagram, chat, video streaming, payments), and master DSA patterns with step-by-step algorithm visualizations and interview guides.
Hey Product Hunt 👋
I'm the solo maker behind PrepGrind.
I built it out of frustration. When I was prepping for system design interviews, everything was passive - reading articles, staring at static diagrams, memorizing answers I couldn't actually defend. I could say "add a cache to reduce database load," but I had no feel for how much it helped or what would break first under load. You just can't get that from a blog post.
So I made PrepGrind - a place where you actually build the system instead of reading about it:
🧩 Drag real components onto a canvas - load balancers, caches, queues, databases, even LLMs and vector DBs
⚙️ Configure each one (cache hit-rate, capacity, rate limits, load-balancer strategy)
📊 Push live traffic through it and watch real-time throughput, latency and error rates on every node
🔴 Crank the load until something turns red - it flags exactly what fails under pressure (bottlenecks, single points of failure)
🟢 Add capacity and watch it recover in real time
You learn the trade-off by seeing it, not memorizing it.
It's more than system design too - there are 35+ real case studies (URL shortener, chat, video streaming, RAG, recommendation engines…), a DSA pattern tracker with a personalized prep plan, and an interactive AI module that visually unpacks how things like attention, embeddings and RAG actually work.
It runs right in your browser - free to start, no signup needed.
I'm building this solo and would genuinely love your feedback:
👉 Does the simulation help your intuition, or does the approximation bug you?
👉 What case study or feature should I add next?
Thanks so much for checking it out 🙏
About PrepGrind on Product Hunt
“Learn system design, DSA & AI by building, not memorizing”
PrepGrind was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #95 on the daily leaderboard. PrepGrind is a interactive playground to learn system design and data structures, algorithms (DSA) & AI. Build architecture diagrams on a drag-and-drop canvas, run live traffic simulations, study 33 real system design case studies (URL shortener, Instagram, chat, video streaming, payments), and master DSA patterns with step-by-step algorithm visualizations and interview guides.
On the analytics side, PrepGrind competes within Education, Developer Tools and Artificial Intelligence — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how PrepGrind performed against the three products that launched closest to it on the same day.
Who hunted PrepGrind?
PrepGrind was hunted by Socialixer. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of PrepGrind including community comment highlights and product details, visit the product overview.
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