ERP for small business: how to choose between Odoo, NetSuite, Business Central and a custom ERP

What is an ERP?

ERP stands for enterprise resource planning. In plain words, it is one system that runs the core of your business. Each part shares the same data, so a sale updates stock, the invoice and the books at once.

A typical ERP covers:

• Finance: General ledger, bills you owe, money owed to you, and bank reconciliation.
• Inventory: Stock levels, locations and reorder points.
• Orders: From quote to delivery to invoice.
• Purchasing: Orders to suppliers and tracking what has arrived.
• Manufacturing: Bills of materials and production planning, if you make things.
• Reports: Live numbers across the whole business.

Does a small business need an ERP?

Many small businesses do not need one yet. If accounting software and one or two other tools cover your work, and they connect well, an ERP may add cost and training without much gain.

The signs that you are ready for an ERP look like this:

• Double entry: Staff type the same order into two or three systems.
• Late numbers: You wait until month end to know your real margin or stock value.
• Stock surprises: You sell items you do not have, or find stock you forgot you had.
• Growth strain: A new location, warehouse or sales channel breaks your current setup.

If inventory is the main problem, start with my guide to an inventory management system. It may solve the issue at a lower cost.

Which ERP systems suit small businesses?

Three products come up most for small and mid-size firms. Prices come from each vendor's own pages, as of October 2026.

Odoo

Odoo is a set of business apps that share one database. You can start with one app, such as Inventory or Invoicing, and add more later.

• One App Free: One app for unlimited users, at no cost.
• Standard: All apps on Odoo's cloud for $38.90 a user a month. Odoo shows a lower price of $31.10 for the first 12 months on the first users you order.
• Custom: $58.40 a user a month, with a first-year price of $46.70. It adds Odoo Studio for changes, multi-company support and access to the external API, which lets other software read and write Odoo data.

Odoo says the plans include hosting, support and upgrades. Implementation and expert services cost extra.

Oracle NetSuite

NetSuite is a cloud ERP that covers accounting, financial planning, inventory, order processing, supply chain, warehouse work and purchasing. It also handles many currencies and many companies under one roof.

NetSuite does not list prices on its site. Its ERP page says customers pay an annual license fee with three parts: the core platform, optional modules and the number of users. There is also a one-time fee for setup. You need a quote from NetSuite or a partner to know your cost.

Microsoft Dynamics 365 Business Central

Business Central is Microsoft's ERP for small and mid-size businesses. It works closely with Microsoft 365 apps such as Outlook and Excel.

• Essentials: $80 a user a month, paid yearly. Covers finance, sales and operations, with Microsoft Copilot included.
• Premium: $110 a user a month, paid yearly. Adds service management and manufacturing.
• Team Members: $8 a user a month, paid yearly, for staff who only read data, approve steps or update some records.

Microsoft notes that prices can vary by country and region.

How they compare

ERP	Price as of Oct 2026	Billing	Good fit for
Odoo	Free for one app, then $38.90 a user a month	Per user, with a first-year discount	Owners who want to start small and add apps
NetSuite	Quote only	Annual license plus setup fee	Growing firms with many entities or currencies
Business Central	From $80 a user a month	Paid yearly	Teams that already run on Microsoft 365

Remember that the license is only part of the cost. Setup, data moves, training and partner fees can add a lot, so ask each vendor or partner for a full first-year estimate.

ERP vs custom software: which is right?

A ready-made ERP gives you tested accounting, a large set of features and a vendor that keeps it updated. The trade-off is that your business has to follow the ERP's way of working, or pay for changes.

A custom ERP is built around your own process. It usually covers fewer areas, but each one fits exactly. Many custom ERPs keep accounting in a tool such as QuickBooks or Xero and build the operations side around it.

Choose a ready-made ERP if

• Your process is common: You buy, stock and sell in a standard way.
• Finance is complex: You need many companies, currencies or strict audit trails.
• You want a vendor to own updates: You would rather not manage software yourself.

Consider a custom ERP if

• Your operations are unusual: You run rentals, made-to-order jobs, field service or mixed models that standard ERPs handle poorly.
• You only need a few modules: You need orders, stock and scheduling tied together, and you do not need a full ERP suite.
• Seat fees add up: Many staff need light access, and full user licenses for each one get costly.
• Deep links matter: The system must talk to your own website, machines, job software or partner systems.
• You must own the data: Contracts or rules require you to control where data lives.

My build vs buy software guide explains how to weigh the costs over three to five years. For a sense of what custom software costs to build, see my guide on custom software development cost.

How can AI help in an ERP?

AI is useful in an ERP when it handles routine reading and checking. Examples that work today:

• Bill entry: AI reads supplier bills, matches them to purchase orders and flags any that do not match.
• Demand planning: AI studies past orders by season and suggests what to buy and when.
• Plain questions: A manager asks "which customers are late on payment this month?" and gets a direct answer.

Keep staff in charge of payments and posting to the books. AI should prepare the work, and a person should approve it.

Is a custom ERP actually the right call for a business your size?

Be honest with yourself before you spend six figures. Independent analysis of custom versus ready-made ERP projects consistently finds that most small and medium businesses are better served by a standard package precisely because their processes are not actually unique enough to justify the cost, even though it rarely feels that way from the inside. Ready-made is faster and cheaper to deploy, and for a business with fairly ordinary workflows, it carries less risk. The real cost most owners miss with a custom build is not the first build, it is that a highly customized system needs its customizations redone every time you want to take a platform upgrade, since vendors change their underlying systems on their own schedule. Custom only earns its cost back when your processes or your compliance needs are genuinely unusual, not just inconvenient.

How would Blur Studio approach a custom ERP?

I start with one question: where does your business lose the most time or money today? I map each step from order to cash and every tool that touches it. Then I build the modules that fix the biggest gaps first, and connect them to the tools you keep, such as your accounting software. I build in stages, so your staff can use each part before the next one starts. When the work is done, your company holds the code and every account behind it. After launch, I take care of the system and keep it up to date. If Odoo or Business Central fits your business well, I will tell you to use it.