*Disclosure: I'm on the SellingPilot team.*
**What's the app?**
SellingPilot is a multi-channel e-commerce app for Shopify sellers who also sell on other marketplaces. This post focuses on one feature that matters a lot right now with Black Friday about five weeks out: **inventory sync**. All your channels draw from one shared inventory source, and rules decide how much stock each channel gets.
**Where can I find it?**
- Shopify App Store: https://apps.shopify.com/sellingpilot
- Website: https://www.sellingpilot.com
**What problem are you solving?**
Overselling during BFCM. When the same stock is counted separately in each channel's backend, it's manageable on a normal day. But when orders spike on several channels at once, and especially when a bestseller is down to its last few units, two or three channels can sell the same unit.
Then you're cancelling orders, which hurts your seller metrics on marketplaces like Amazon and Walmart, during the highest-traffic days of the year. The opposite happens too: your main channel runs out while a test channel sits on stock it won't sell until after Christmas.
**How does the app work?**
**Shared inventory source.** One inventory source feeds all connected channels, so you manage stock in one place instead of in every backend.
**Automatic sync.** Stock levels are pushed to each channel automatically based on your rules.
**Sync ratio + max stock.** For each channel, set what percentage of available stock it gets and an optional cap. For example, give your main channel priority and limit how much a test channel can hold.
**Sell-out threshold.** When stock drops below a number you set, that channel's listed stock is set to zero. This keeps a safety buffer.
One thing to be upfront about: the shared inventory source is read roughly **once an hour**, so this isn't real-time sync. That's exactly why the sell-out threshold matters. For fast-moving SKUs during BFCM, set a buffer that covers about an hour of sales.
**Who's your target merchant?**
Shopify sellers who also sell on other marketplaces, have more SKUs or channels than they can update by hand, and are worried about overselling or uneven stock allocation going into peak season.
Supported channels: Shopify, Amazon, Walmart, TikTok Shop, eBay, Temu, SHEIN, Newegg, Best Buy, WooCommerce.
**How is it different / better than other existing solutions?**
- **Rule-based allocation, not just mirroring.** Many sync setups copy the same number to every channel. Ratios, caps, and sell-out thresholds let you decide where stock goes.
- **10 channels in one place,** including marketplaces like Newegg, Best Buy, Temu, and SHEIN alongside the usual ones.
- **Part of a broader toolkit.** The same app also handles AI listing optimization, review analysis, competitor comparison, product research, and AI product images, so you're not stitching together several tools.
**How much does it cost?**
[Free plan / Inventory sync availability and limits per plan — please confirm]
**What are you looking for?**
Multi-channel merchants who want to get their inventory rules set up before BFCM and are willing to give honest feedback. If you've dealt with BFCM overselling before, I'd like to hear what went wrong and whether this setup would have prevented it.
I'll be around in the comments to answer questions.