SyncGuard: Real-Time Inventory Sync & Conflict Guard for Etsy & Square Sellers

Anyone else still dealing with Etsy-Square sync issues before shows?

The spinning and resetting is not a bug you can fix, it is what the connection actually is. Etsy and Square do not talk to each other. Whatever is bridging them is a third party app polling both platforms on an interval, usually somewhere between 15 minutes and an hour, and pushing whatever it read the last time it checked. During that gap both channels think they have the full count, which is exactly how you oversell, and "spinning forever" is usually that poll failing silently and retrying. Manual deactivation works precisely because it removes the gap, not because it is more careful. You are just doing by hand what the sync app is supposed to do continuously and does not. Two ways people actually make this reliable. One is to stop sharing one count at all: give the show a small fixed buffer of units (say 3 of your top sellers) that live under a separate SKU or variant only used in person, so the shared online count never has to move in real time and nothing needs deactivating. The other, if you want the real number, is to skip the syncing middleman and read both platforms directly at the moment that matters: Etsy's inventory API and Square's inventory API each return actual current counts on request, no polling delay. A short script that pulls both right before doors open and flags any listing where the numbers disagree takes under a minute to run and tells you exactly what to fix before you sell a single thing twice, instead of trusting a sync that has already let you down. Which one fits depends on how many SKUs you are juggling. Under 20ish, the buffer approach is genuinely less work. Past that, checking two numbers by hand stops being reliable and the direct pull is worth the setup once.