The verdict in three sentences
Choose Odoo if your process is standard and you accept adapting to the tool; choose custom if your process is your competitive edge. Over 5 years, the TCO can cross: Odoo is cheaper upfront but licences and integration add up. The real question is not the initial price but vendor lock-in and your ability to evolve the tool.
Initial cost and 5-year TCO: the comparison
Odoo shows a lower entry ticket but recurring costs (per-user licences, maintaining customisations at each version upgrade). Custom costs more to build but has no licence. Here are the 2026 orders of magnitude.
| Item | Odoo | Custom |
|---|---|---|
| Initial build / integration | EUR 20,000 - 80,000 | EUR 40,000 - 120,000 |
| Licences (20 users) | ~EUR 7,000 - 12,000/year | EUR 0 |
| Hosting | included (Cloud) or EUR 2,000/year | EUR 1,500 - 6,000/year |
| Evolutionary maintenance | EUR 6,000 - 15,000/year | EUR 8,000 - 20,000/year |
| Major version migration | EUR 8,000 - 25,000/3 years | not applicable |
| 5-year TCO (estimate) | EUR 90,000 - 200,000 | EUR 90,000 - 220,000 |
The TCO often crosses around year 4: Odoo wins at launch, custom catches up as licences and migrations accumulate.
Decision grid: 6 criteria
The choice hinges on qualitative as much as financial criteria. Score each for your context.
| Criterion | Favours Odoo | Favours custom |
|---|---|---|
| Process standardisation | Classic process | Differentiating process |
| Time to go-live | 2-4 months | 4-8 months |
| Functional flexibility | Modular but framed | Unlimited |
| Vendor lock-in | Strong (Odoo roadmap) | None |
| Internal skills | Odoo integrator needed | Dev team/agency |
| Long-term scalability | Good if standard | Excellent if maintained |
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Mini case study
Marc, operations director of a trading SME in Bordeaux, is torn on his sales and stock management tool. His buy-resell process is 80% standard. Custom would cost EUR 85,000 to build. He picks Odoo: EUR 45,000 integration, EUR 9,000/year licences, customising the specific 20%. 5-year TCO estimated at EUR 135,000 versus EUR 165,000 custom. He accepts vendor lock-in because his competitive edge is not in the management tool but in his supplier network.
FAQ
When is custom clearly justified? When your business process is your competitive edge and no standard ERP supports it without costly contortions. If you customise Odoo beyond 40%, custom becomes competitive again.
Is Odoo really cheaper? Short term yes (2 to 4 years). Over 5 years, per-user licences and major version migrations close much of the gap, especially above 30 users.
What is vendor lock-in in practice? You follow Odoo's roadmap: forced upgrades, evolving modules, rising prices. With custom you control the calendar but bear maintenance alone.
Can you mix Odoo and custom? Yes: Odoo for accounting and purchasing (standard), a custom module connected by API for your differentiating core. Often the best TCO.
How long to go live? Odoo: 2 to 4 months for a standard integration. Custom: 4 to 8 months depending on scope. Add 1 month of change management in both cases.
Let's scope your project. Describe your key processes, user count and a target budget: we cost the 5-year TCO of both options and recommend build or buy. 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.
