Multichannel inventory management in Singapore
If you sell the same stock on Shopee, Lazada, TikTok Shop and your own store, you have one real inventory and several systems each convinced it owns all of it. This is what goes wrong, the options for fixing it, and the questions worth asking before you pay for anything.
The actual problem
You have 41 units on the shelf. You listed them on four channels, because that is where the buyers are. Each channel now shows 41 available, which means you are advertising 164 units you do not have.
Most of the time this is fine, because most of the time you are not selling fast enough for it to matter. It stops being fine during a campaign. Two buyers on two channels order the last unit within the same minute, and one of them gets a cancellation, a refund and a reason to leave you a one-star review. Marketplaces track cancellations too, so the cost outlasts the order.
The underlying issue is that no marketplace will ever tell another marketplace what it just sold. Something outside all of them has to hold the real number.
- Shopee41
- Lazada41
- TikTok Shop38−3 vs others
- Shopify41
EMMA keeps the gap, holds sync rules for this SKU, and waits for you to say which figure is right. Pushing one number over the other three is how you advertise stock you do not have.
How people solve it
A spreadsheet
What it isFree, familiar, and already open on your desktop.
Where it stopsIt is accurate at the moment you finish updating it. Every sale after that is another edit somebody has to remember to make.
Each marketplace's own tools
What it isNative to the channel, included in what you already pay, and built by the people who run it.
Where it stopsEach one only knows about its own orders. Nothing tells one channel what another just sold.
A full ERP
What it isOne system covering accounting, purchasing and warehousing alongside stock.
Where it stopsScoped for a larger operation. It pays back once you have the processes and the headcount to run it.
A dedicated sync tool
What it isOne job: hold a single stock figure and write it to every channel as sales come in.
Where it stopsIt can only sync the channels it connects to, so the channel list matters as much as the feature list.
Most sellers move down this list as they grow, and plenty run more than one at once.
Questions worth asking any sync tool
Including this one. The answers are worth having before you commit to anything.
Which channels does it actually connect to?
Start here, because everything else is academic if the tool does not cover the channels you sell on. Ask about the ones you are on now and the ones you expect to add.
What does it do when two channels disagree?
This is the question that separates tools. Pushing one number over the others can put stock on sale that is not on the shelf. EMMA keeps the gap, holds sync rules for that SKU and asks you which figure is right.
Can it handle bundles?
If you sell singles and multipacks of the same thing, a tool that only maps one SKU to one SKU will not get you there. Ask whether component quantities cascade, and whether it refuses rules that contradict each other.
What happens when a marketplace sends an order twice?
Duplicate order events are a normal part of working with marketplace APIs. Ask how they are handled, so the same sale cannot come off your stock twice.
How does it treat stock committed to a campaign?
Campaign commitments change how much stock a channel treats as available. Worth asking how the tool accounts for that before a campaign rather than during one.
Who answers when it breaks, and when?
Ask where support sits and what hours it keeps. Stock questions are time-sensitive, and the useful answer is the one that arrives the same day.
What is different about doing this in Singapore
- The channel mix is local. Shopee, Lazada and TikTok Shop carry most of the volume here, alongside local marketplaces such as FairPrice Marketplace. A tool built around Amazon and eBay may not cover the list you actually sell on.
- Campaign mechanics matter more. 11.11, 12.12 and payday sales concentrate a lot of volume into a few hours, which is when stock accuracy stops being a background concern.
- The same units sell on every channel. The other way to avoid overselling is to split stock, 40 units to Shopee and 40 to Lazada. In a market this size that mostly means going out of stock on one channel while the units sit unsold on another, so almost nobody does it. One pool of stock across every listing is the normal setup here, and it is what creates the problem in the first place.
- Buffer stock is expensive to hold. The usual workaround for unreliable sync is to keep a few units back on every channel as insurance. Singapore storage costs make that a real line item, and the sellers who can least afford idle stock are the ones who most need the number to be right.
- Delivery is quick, so mistakes surface quickly. Orders picked up the same day and delivered the next leave no quiet window to catch a bad stock figure. You find out from the buyer.
How EMMA does it
EMMA is the dedicated sync tool option. It connects to 6 sales channels, holds one stock figure, and writes it to every connected channel as soon as anything changes. Each order event is claimed once before your stock is touched, so a repeated notification cannot deduct the same sale twice and a failed job cannot lose one.
Plans are billed monthly in Singapore dollars, and the first 14 days are free without a card. See the plans, or the channels we connect to.