The verdict in three sentences
A SaaS WMS (EUR 500-4,000/month) is the right call while your warehouse processes stay standard and your volume predictable. A custom WMS (EUR 60,000-150,000 + 15-20%/year maintenance) pays off when your slotting rules, multi-channel picking or EDI flows exceed the catalog's reach. Either way, the real value is a picking error rate cut by 50-80% and a sharp rise in picking productivity.
SaaS or custom: the underlying math
The logistics manager chooses between two logics: renting a proven solution that imposes its processes, or funding a tool that fits yours. SaaS wins on go-live speed and entry cost; custom wins on business fit and no perpetual license lock-in.
| Criterion | SaaS WMS | Custom WMS |
|---|---|---|
| 2026 cost | EUR 500-4,000/month | EUR 60,000-150,000 |
| Maintenance | Included | 15-20%/year |
| Go-live | 6-12 weeks | 4-8 months |
| Scan terminals | Extra (EUR 200-600/unit) | Extra |
| Business fit | 70-85% | 95-100% |
| Break-even vs SaaS | — | 3-5 years |
A 3,000 sqm warehouse with 12 pickers often pays EUR 1,800-2,500/month on SaaS, i.e. EUR 21,000-30,000/year. Over five years that is EUR 105,000-150,000: within that range, a well-scoped custom build becomes a serious alternative.
The features that protect your margin
Fine slotting and optimized picking are the two most profitable productivity levers. TMS/ERP/e-commerce integration and EDI prevent the information breaks that cause errors and disputes.
| Feature | Expected 2026 gain | Standard SaaS | Custom |
|---|---|---|---|
| Slotting management | +15-30% density | Yes | Advanced rules |
| Optimized picking/packing | -50 to -80% errors | Yes | Fine multi-channel |
| TMS/ERP/e-commerce integration | Zero double entry | Limited connectors | Full |
| Supplier/customer EDI | -3 to -5 days cycle | Often optional | Native |
| Cycle counting | -70% inventory stops | Yes | Yes |
| Productivity analytics | Data decisions | Basic | Custom |
A seasonal e-tailer prioritizes multi-order picking and waves; a B2B distributor bets on EDI and cross-docking.
Mini case study
Sonia is logistics manager at a Lyon e-tailer: 3,500 SKUs, 12 pickers, 1,900 orders/day at peak. Her SaaS WMS costs EUR 2,300/month (EUR 27,600/year) but her picking error rate stalls at 1.8%, i.e. about 34 wrong orders/day and EUR 90,000/year in returns and goodwill. A custom WMS at EUR 110,000 + EUR 19,000/year maintenance, with wave picking and scan verification at pack, brings errors to 0.4%. Error savings alone top EUR 65,000/year; added to the EUR 27,600 of removed SaaS, break-even lands around 30 months.
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FAQ
Is a SaaS WMS enough for a growing warehouse?
Often yes up to a certain volume and multi-channel complexity. Beyond that, configuration fees and connector limits end up matching the cost of a custom build.
What do scan terminals cost?
Expect EUR 200-600 per rugged terminal, plus Wi-Fi coverage. It is a line item separate from the software, to budget whether you pick SaaS or custom.
What realistic gain on the error rate?
Systematic scan verification at pick and pack cuts errors by 50-80%. At high volume it is the fastest savings line to pay back.
How long to deploy a custom WMS?
Between 4 and 8 months by scope and integrations. A receiving/slotting/picking core ships in 4 months; EDI and e-commerce connectors follow.
Does the WMS connect to my ERP and TMS?
Yes. In SaaS, connectors exist but are limited to certain brands; in custom, we integrate exactly your ERP, TMS and stores.
Let's scope your project. Give us your floor area, SKU count, peak volumes and target integrations, and we will price a managed SaaS or custom WMS. 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.
