ERP comparison

Custom ERP or Odoo?

Odoo is a modular business suite, with an open-source edition, a large partner network and apps for most of what a small business needs. It’s a serious option. Here is when a custom ERP makes more sense, and when you should simply buy Odoo.

Get a quote The short answer

The short answer

If your business fits standard accounting, inventory, sales and HR flows, Odoo is a good buy and you should use it with a reputable partner. A custom ERP makes sense when your operation has its own rules, such as how you quote, schedule a crew or bill storage, and you would otherwise spend the project fighting the configuration. Plenty of businesses are best served by Odoo for the standard parts and a custom piece for the rest.

Side by side

Custom vs Odoo, factor by factor.

Factor	A custom system	Odoo
Cost model	A build cost in phases, then hosting and optional support. No licence per user.	An open-source Community edition, and a licensed Enterprise edition priced per user per month. Implementation by a partner is usually a separate cost.
Fit to your process	Built around your quotes, jobs, stock and billing rules, with nothing you don’t use.	A modular suite of apps (sales, inventory, accounting and more). Strong for standard flows, with customisation for the rest.
Time to start	Weeks for a first phase, then more phases.	Quick for a standard setup. A tailored implementation with data migration is a project in its own right.
Customisation	Anything can be built. You are paying for the work, not for a configuration tool.	Configuration tools, custom modules and a store of third-party apps. Which customisation tools and API access you get depends on the plan.
Hosting options	Hosted where you choose, with the hosting accounts in your own name.	Vendor-hosted, a platform for custom modules, or self-hosted on your own servers, depending on edition and plan.
Integrations	Built for your tools, including WhatsApp and your website.	A third-party app store, an API and partners for the usual connections. Check each one for your exact need.
Data ownership and export	Your data in its own database, in a documented structure you can export. Agree what you receive at handover in writing.	With self-hosting or the open-source edition, you hold the database. In the hosted editions, confirm the export options.
Scaling with team size	Cost follows effort and hosting, not seats.	Enterprise cost follows users. Multi-company setups are part of its plans.
Support and partners	One person who knows your system.	A wide partner network across Europe, including in Malta, plus vendor support. You get choice and depth of experience.

Choose Odoo if

Your flows are close to standard: accounting, sales, purchasing, inventory.
You want accounting, stock and HR in one widely used suite.
You expect to grow to multiple companies, warehouses or countries.
You want to be able to choose between several partners who can support it.
You prefer open source and the option of self-hosting.

Choose custom if

Your process is the edge: how you quote, schedule crews, bill storage or run admissions.
You want the team in the field, the office and the customer on one set of data without installing and tuning many modules.
An implementation project would be bigger than the problem.
You don’t want a licence per user as the team grows.

What it really costs over three years

For Odoo, the sum depends on edition. With Community, there is no licence, but you pay for hosting, implementation and ongoing support. With Enterprise: price per user per month, times users, times months, plus the implementation project, plus any third-party apps or custom modules, plus a partner for support. Odoo’s own pricing page is useful for the structure, and the real figure comes from a partner’s quote.

For a custom ERP the sum is the build, driven by modules and integrations, plus hosting and support. Using the quote builder’s hours, a system takes 30 to 50 hours of shared groundwork plus each module, delivered at about 30 build hours a week. That is why I build in phases, core first.

The honest comparison is rarely licences against build. It is the implementation and configuration project for the product against the build for custom. If your process fits the product, the product’s project is smaller. If it doesn’t, much of that project is spent bending the product.

Where each one breaks

Odoo breaks where a standard module meets a non-standard process. You can customise, and a partner will, but each customisation becomes something to maintain across upgrades. It can also feel heavy to a ten-person business using a small slice of a very large suite.

A custom ERP breaks on scope and on continuity. It doesn’t have a partner network or a certified pool of consultants. It also doesn’t come with finished accounting, payroll or manufacturing: for those I would connect an accounting package rather than rebuild one.

The hybrid: Odoo for the standard parts, custom for the rest

Odoo has an API and a customisation layer, so a custom piece can sit next to it. A reasonable split: Odoo for accounting and inventory, and a custom portal, quoting engine or crew app for the parts that are yours. Or the reverse: a custom ERP for operations, connected to your accounting package.

Read the custom ERP service page for the modules I build, and the integrations page for the connecting work. If one off-the-shelf product covers most of what you do, connecting it is the better job and I will say so.

A real example of a custom ERP, and how a switch works

Storex is a storage and logistics company whose whole operation now runs on a custom system: quotes, clients, invoicing, the warehouse map, the crew app and a customer portal. It grew in phases from a simple tracker. The Storex case study goes through each part. I haven’t built a replacement for an Odoo installation for a named client yet; these are the same building blocks running live elsewhere.

A switch from Odoo starts with an export from the modules you use, then mapping, cleaning, loading and checking against the source. With self-hosting or Community you can also read the database directly. The two run side by side until the numbers agree.

FAQ

Questions, answered.

Is Odoo free?

There is an open-source Community edition, and a licensed Enterprise edition priced per user per month. Hosting, implementation and support cost money either way, so compare the whole project, not just the licence.

Can Odoo handle our specific process?

Often, with configuration and custom modules, usually through a partner. The question is how much customisation you need, because each piece has to be maintained through upgrades.

Can you work alongside Odoo?

Yes. Odoo has an API and a customisation layer, so I can build the missing piece, such as a customer portal or field app, that works with its data. Whether that beats a full custom ERP depends on how much of Odoo you would really use.

What about accounting?

I wouldn’t rebuild accounting. Whether it is Odoo’s accounting app or another package, I connect it so invoices and payments flow across and your accountant keeps working in the tool they know.

Is a custom ERP realistic for a small business?

Yes, in phases. The first phase covers what costs you the most time, usually quotes, clients and invoicing, and the rest follows while you are already using it.

Go deeper

Get a fixed quote.

Not sure which way to go? Scope it in the quote builder and I’ll tell you honestly whether custom is worth it for you.

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