The verdict in three sentences
Running several warehouses on spreadsheets breeds stockouts, overstock and inventory errors. In 2026, custom multi-warehouse inventory software costs USD 45,000-110,000, versus USD 35-100/user/month for a vertical SaaS. Custom is warranted as soon as your replenishment rules, inter-warehouse transfers or e-commerce integration fall outside the standard.
Vertical SaaS or custom: the right trade-off
SaaS starts fast and cheap upfront, but the bill climbs with users and hits walls on specific needs. Custom costs more initially but fits your flows.
| Criterion (2026 order of magnitude) | Vertical SaaS | Custom |
|---|---|---|
| Cost per user | USD 35-100/mo | USD 0 |
| Upfront investment | USD 0-6,000 | USD 45,000-110,000 |
| Time to go live | 2-6 weeks | 4-6 months |
| Specific replenishment rules | limited | fully free |
| Inter-warehouse transfers | often basic | tailored |
| E-commerce / ERP integration | connector-dependent | native |
| Annual maintenance | included in fee | 10-15%/yr |
What fine-grained control returns
Value shows up on three lines: avoided stockouts (saved sales), reduced overstock (freed cash) and inventory time.
| Item (3 warehouses, 4,000 SKUs) | On spreadsheets | With software |
|---|---|---|
| Stockout rate | 6-10% | -30 to -50% |
| Overstock tied up | high | -15 to -25% |
| Annual inventory time | 8-12 days/person | 2-4 days/person |
| Theoretical stock accuracy | 70-85% | 96-99% |
| Picking errors | frequent | rare (scan) |
Mini case study
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Sofiane, logistics manager in Singapore, runs 3 warehouses and 4,000 SKUs on spreadsheets. Stockouts cost roughly 4% of USD 3.4M revenue, i.e. USD 136,000/year in missed sales, half of which is recoverable. Overstock ties up USD 190,000 in cash. Custom software at USD 74,000 with USD 9,000/year maintenance recovers about USD 58,000/year in sales and frees USD 37,000 in cash in year one. Payback in just over a year, excluding inventory time savings.
FAQ
Is barcode scanning essential? Yes for accuracy: manual entry caps at 70-85% theoretical stock accuracy versus 96-99% with scanning. It is the top ROI line in order picking.
Is a vertical SaaS enough for 3 warehouses? Often yes if your flows are standard. Custom becomes relevant above 10-15 users, or if your inter-warehouse transfers and replenishment rules are specific.
Can we connect the e-commerce store? Yes, stock/order sync is a common need. In custom it is native; in SaaS it depends on the connectors available for your platform.
How long to be operational? 4 to 6 months for custom, including a data migration and initial inventory phase. Plan a full physical count at launch to start from a reliable base.
What maintenance budget? 10-15% of development cost per year, i.e. USD 7,000-14,000 for USD 74,000 software. In SaaS, maintenance is included but the subscription grows with users.
Let's scope your project. Tell us your number of warehouses, SKUs and users, plus your e-commerce platform, and we will compare SaaS and custom with figures. Detailed quote within 48 h. 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.
