The verdict in three sentences
Siloed stock (one entry at the till, another online) generates double entry, errors and overselling that force you to cancel orders that are already paid. Unified real-time inventory (a single source of truth, reservation on add-to-cart) eliminates this risk. The stakes: overselling costs more in reputation than in logistics.
Siloed stock vs unified stock
The core problem: when the physical store and the website each sell against their own counter, the same item can be sold twice. The online customer pays, then learns the product is no longer available.
| Criterion | Siloed stock | Unified real-time stock |
|---|---|---|
| Source of truth | Multiple (till + site) | Single |
| Overselling rate | 5 - 12 % | < 1 % |
| Update | Manual, delayed | Automatic, < 30 s |
| Cart reservation | No | Yes |
| Data-entry errors | Frequent | Rare |
| Multi-warehouse | Difficult | Native |
The acceptable sync delay in 2026 is under 30 seconds: beyond that, two customers can buy the same last unit at the same time.
The cost of an order cancelled for stockout
Overselling is not just an annoyance: it's a refund, a frustrated customer and often a negative review. Here are the cost lines.
| Line item | Cost / impact (2026, estimate) |
|---|---|
| Momo refund to process | Fees + time (D+1 to D+3) |
| Courier cost if already dispatched | 1,500 - 3,500 FCFA lost |
| Reputation loss (negative review) | 5 - 10 potential customers lost |
| Cancellation rate without sync | 5 - 12 % of orders |
| Cancellation rate with sync | < 1 % |
| Automatic restock alert | Stockout avoided before zero |
An 8 % cancellation rate on 200 orders means 16 disappointed customers per month, some of whom will never return. Real-time sync brings this down to 1-2.
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Mini case study
Coumba owns a fashion store in Dakar with a physical point of sale and a website. She manages two separate stocks. Of 220 online orders/month, 9 % are cancelled for stockout (item already sold in-store), i.e. 20 orders. Each cancellation costs her a refund + 2,500 FCFA of a courier dispatched for nothing in half the cases = about 25,000 FCFA/month in direct cost, not counting reputation.
She switches to unified stock: every till sale instantly decrements online stock, and the cart reserves the item for 15 minutes. Cancellations drop to 1 %, i.e. 2 orders. Direct cost: about 3,000 FCFA/month. Direct savings: 22,000 FCFA/month, and above all 18 fewer disappointed customers each month, a reputation gain impossible to quantify but decisive.
FAQ
What overselling rate occurs without synchronization? As a 2026 order of magnitude, between 5 and 12 % of online orders when physical and online stock are managed separately, because the same item can be sold twice.
What sync delay should you target? Under 30 seconds. Beyond that, two customers can buy the same last unit simultaneously. A truly unified stock updates on every sale, at the till and online.
Is cart reservation useful? Yes: reserving the item for 10 to 15 minutes from add-to-cart prevents a second customer from buying it while the first is paying, further reducing overselling.
Can you manage several warehouses? Yes: unified stock natively manages several points of sale and warehouses, with automatic restock alerts before stockout, avoiding surprise zero stock.
How much does setup cost? As a 2026 order of magnitude, budget from 350,000 FCFA to unify till and site with real-time synchronization, depending on the number of points of sale and products.
Let's talk about your project. We unify your till and online stock in real time, with cart reservation and restock alerts. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
