The verdict in three sentences
Connecting ERP + TMS + WMS costs 60,000 to 140,000 EUR for a logistics group, but the real stake is removing double entry and stock reliability rising from 92% to 99%. The choice sits between native APIs (fast but rigid), iPaaS middleware (flexible, 500-2,000 EUR/month) and custom (total, but heavy). Decide on the number of connectors and sync frequency, not the headline price alone.
The three integration scenarios
The goal: an order created in the ERP triggers transport assignment (TMS) and warehouse picking (WMS) with no re-keying. Three architectures exist.
| Scenario | Project cost | Recurring | Timeline | Flexibility |
|---|---|---|---|---|
| Native APIs (point-to-point) | 15,000-40,000 EUR/connector | Maintenance 8-15%/year | 2-4 months | Low |
| iPaaS middleware | 30,000-70,000 EUR | 500-2,000 EUR/month | 3-5 months | High |
| Custom (application bus) | 80,000-140,000 EUR | Hosting 300-800 EUR/month | 5-7 months | Total |
For three systems (ERP, TMS, WMS), point-to-point requires up to 6 connectors — hence the appeal of an iPaaS or a bus that centralizes flows. A full three-system project usually lands between 60,000 and 140,000 EUR, over a 4-to-7-month timeline.
What integration delivers
Value shows up in reliable data and reclaimed admin time.
| Metric | Before | After integration |
|---|---|---|
| Order double entry | 100% manual | Removed 100% |
| Stock reliability | 92% | 99% |
| Order → picking delay | 3-6 h | Real-time |
| Re-keying errors | 2-4% | < 0.3% |
| Admin time/day (team) | 5-8 h | 1-2 h |
Moving stock reliability from 92% to 99% cuts both stockouts and overstock: it is often the single line item that justifies the investment.
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Mini case study
Yann, CIO of a logistics group (unconnected ERP, TMS and WMS, 12 people in order administration), sees 6 h/day of double entry and 2.5% re-keying errors. He picks an iPaaS middleware: 55,000 EUR project plus 1,200 EUR/month. Double entry disappears, freeing the equivalent of 1.5 FTE (≈ 66,000 EUR/year loaded) and stock reliability rises from 92% to 99%, cutting stockouts and credits by ≈ 40,000 EUR/year. Combined gain ≈ 106,000 EUR/year for a recurring cost of 14,400 EUR/year: ROI reached in year one.
FAQ
How much does an ERP + TMS + WMS integration cost in 2026? A full three-system project lands between 60,000 and 140,000 EUR. Point-to-point runs 15,000-40,000 EUR per connector; iPaaS runs 30,000-70,000 EUR plus 500-2,000 EUR/month subscription.
Native APIs or middleware? Native APIs are faster to connect but rigid and costly to multiply. iPaaS middleware centralizes flows, absorbs changes and avoids piling up point-to-point connectors.
Does integration really remove double entry? Yes: well designed, it removes 100% of re-keying between order, transport and warehouse. It is the top saving, in admin time and errors avoided.
What stock-reliability gain to expect? Moving from ~92% to ~99% is a realistic 2026 order of magnitude once flows sync in real time. It cuts stockouts and overstock at the same time.
What timeline to plan? 2-4 months for limited point-to-point, 3-5 months for an iPaaS, 5-7 months for a custom application bus including testing and cutover.
Let's scope your project. List your systems (ERP, TMS, WMS), the number of connectors and the sync frequency you need: we'll quantify the iPaaS vs custom scenario. 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.
