Free tool · runs in your browser
Oversell Guard
Split one stock pool across every sales channel so you never sell the same last unit twice.
Quick summary: When you list one pile of stock on several channels (Amazon, eBay, Shopify, your own site), a slow-to-sync channel can keep selling after you're out — that's how overselling happens. Oversell Guard works out how many units to safely show on each channel, holds a sync-lag safety buffer on the laggy ones, and scores each channel's oversell risk — all from your own numbers, in your browser.
Your stock
Rules
Channels
| Channel | Priority | Sync lag (min) | Sales/day | |
|---|---|---|---|---|
Safe to promise —
| Channel | List | Buffer | Oversell risk |
|---|
This is the maths. In a live system, OpsMavix wires it to your channels so the buffers apply automatically and stock stays in sync — no more oversells, no refunds, no marketplace strikes.
Book a free Operations Leak Audit →Open source
Oversell Guard is a free, zero-dependency JavaScript library — the same code that powers this page. Use it in your own app.