We're now System Overflow (+ Black Friday EXTRA 20% off)
We’re Now System Overflow
If you have been following along, you know us as Preploop. Today, we’re excited to announce our rebrand to System Overflow.
Why the Change?
The old name suggested we were just another interview prep tool. But that’s never been what we’re about.
We build tools for engineers who want to actually understand system design - not just memorize templates for interviews. Engineers who want depth over breadth. Trade-offs over talking points.
System Overflow better reflects what the platform does: help you systematically master the fundamentals and advanced concepts that make distributed systems work.
Same platform. Same 3000+ cards curated by FAANG+ staff-level experts. Your account, progress, streaks, and entire learning journey remain exactly as they were. Just a better name.
Black Friday: EXTRA 20% Off All Plans
To celebrate the rebrand (and because it’s Black Friday), we’re offering 20% off all pro plans through the end of the week.
Early Adopter Pricing + Black Friday Discount:
6 Months Pro: $59 → $47 (20% off)
1 Year Pro: $99 → $79 (20% off)
The discount applies automatically at checkout using code BLACKFRIDAY20.
This stacks with our early adopter pricing, which won’t last forever. Once we hit our growth targets, prices go back to regular rates.
What You Get with Pro
Unlimited learning cards (3000+ cards across System Design aspects ML Systems, and Software Engineering)
Unlimited design practice problems with AI evaluation
Company-specific tagging (Google, Meta, Amazon, Netflix, etc.)
Full access to trade-offs, edge cases, and failure modes
Free tier stays at 6 cards per day if you want to try it first.
What’s Next
The rebrand is just the beginning. We’re shipping:
Audio explanations for every card (already live for 100+ concepts)
YouTube videos breaking down complex system design problems
AI Mock Interviews (not just another AI gimmick - substantive practice that tests your understanding)
Company-specific learning paths
If you’ve bookmarked preploop.io, update your links to http://www.systemoverflow.com. All old links redirect automatically, so nothing breaks.
Thanks for being part of this journey.
P.S. Black Friday discount ends November 30th at midnight UTC. Honestly, this is our biggest sale.