Every semester, millions of dollars in perfectly good furniture, textbooks, and dorm gear gets thrown in dumpsters or left on curbs when students move out. Meanwhile, incoming freshmen spend $500+ furnishing a dorm room from scratch — often buying the exact same stuff that just got tossed three blocks away.

That's the gap Quadsale is built to close: a campus-only marketplace where only verified students at your school can buy and sell with each other.

A few things we learned building this:

1. Trust is the whole game. Campus Facebook groups and Craigslist die because anyone can post. We gate every account behind school email verification — so every buyer/seller you message is confirmed to actually go to your school.

1. Logistics kill resale marketplaces. Shipping a couch makes no sense. Because everyone's on the same campus, meetups happen in person — dorm to dorm, no shipping, no scams disappearing with your money.

1. Timing is everything. The value of a mini-fridge is completely different in week 1 of fall semester vs. finals week in spring. We're building seasonal demand signals directly into the app so sellers know exactly when to list and how to price.

We're live on iOS now (Android coming soon). If you're building anything in the marketplace / resale / campus commerce space, curious to hear how you're thinking about trust and logistics — feels like the two hardest problems in any peer-to-peer marketplace.