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ERP & CRM3 min

Custom ERP or off-the-shelf (Odoo, Sage…): how to choose

Custom or standard ERP? Processes, total cost, integrations, scalability: how to choose between Odoo, Sage, another package or custom development.

FL
By [ First Last ]Software architect · Paris
PublishedOctober 12, 2026
[ Cover image — 2400×1200 ]

Custom or standard ERP? Odoo, Sage, Dynamics and others promise to cover everything from day one. Many SMEs then adapt them for years and pay twice: licence, then workarounds. Custom is not always justified either.

What a market ERP brings

Ready modules, fast start for standard processes, an ecosystem of integrators. Odoo appeals for its modularity, Sage for its accounting roots in France.

The real cost of a standard ERP

Per-user licences, integrator configuration, extra modules, processes bent to the vendor, upgrades that break customisations.

When custom pays off

  1. Specific business processes
  2. More than about twenty users
  3. Strong integration needs — e.g. construction, transport, multi-entity groups
Go custom when your tools cost more in workarounds than in licences.

Hybrid approach

Keep a package for accounting and payroll, build the core business custom — see build or buy software and custom ERP cost.

Custom or standard ERP: FAQ

Is Odoo a custom ERP?

No — it is a highly modular standard ERP that can be customised.

Is a custom ERP riskier?

Only if poorly scoped. Phased delivery and code ownership keep risk under control.

Get advice

Our custom ERP development agency tells you honestly if a market ERP is enough. Talk to an expert.

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