SoldSync — Reseller Inventory & Oversell Tracker

About

Selling the same item on more than one marketplace? SoldSync makes sure you never sell it twice.
SoldSync is a lightweight inventory tracker for resellers who cross-list on eBay, Poshmark, and Mercari. Log each item once, mark where it's listed, and when it sells on one platform SoldSync instantly reminds you to delist it everywhere else — before a double sale wrecks your seller rating.
✅ WHAT IT DOES
• Simple inventory list — title, cost, list price, and which marketplaces each item is on.
• Oversell guard — mark an item "Sold on eBay" and SoldSync flags every other platform it's still live on, so you can delist fast.
• Add from this page — open a listing on eBay/Poshmark/Mercari and pull the title & price in one click.
• Profit calculator — instant net profit after marketplace fees (eBay, Poshmark, Mercari, Depop, Etsy).
🔒 PRIVATE BY DESIGN
Everything is stored locally in your browser. No account, no server, no data collection. SoldSync only reads a page when you click "Add from this page".
🪶 LIGHTWEIGHT
No background processes, no auto-delisting (so it can't get your marketplace accounts flagged). It just helps you keep track.
Free to use. Built for resellers, by people who hate canceling orders.