“Should we get an ERP or build something custom?” It’s one of the most common questions we hear from growing businesses that need to replace spreadsheets and manual processes with a real system. The short answer: it depends on how standard your business actually is. The long answer deserves this guide.
What an ERP is and what it solves well
An ERP (Enterprise Resource Planning) is standard software that covers, out of the box, the processes almost every company shares: accounting, invoicing, purchasing, inventory, payroll. Tools like SAP, Odoo or Holded exist precisely because those processes look similar across most businesses.
An ERP makes sense when:
- Your administrative processes are reasonably standard (invoicing, bookkeeping, basic stock management).
- You need it up and running fast, without waiting months for development.
- The initial budget is limited and you’d rather pay a monthly licence than make a development investment.
- You don’t have highly specific operational processes that a generic ERP doesn’t cover.
What custom software is and what it solves well
Custom software is a system designed specifically around how your business works, not the other way around. Instead of adapting your operation to whatever modules an ERP happens to ship with, the system is built around your real processes.
It makes sense when:
- You have an operational process specific to your industry that no ERP covers well (production traceability, managing field teams, or a particular approval flow, for example).
- Your competitive edge is precisely in doing things differently from your competitors — and a standard ERP would force you to do it “like everyone else.”
- You need to integrate several existing systems in a way an ERP doesn’t allow without expensive add-on development.
- The cost of per-user ERP licences, over the long run and at your headcount, ends up higher than owning your own system.
Where an ERP falls short
ERPs are designed for the general case, not for yours. When your process falls outside the standard, the options are usually: pay for custom development on top of the ERP itself (expensive and slow, since you depend on the vendor), force your operation to fit the ERP’s mould (losing efficiency), or live with parallel spreadsheets for whatever the ERP doesn’t cover — which is exactly the problem you were trying to solve.
Where custom software falls short
Building from scratch means nothing comes “already done.” Accounting, e-invoicing compliant with local regulations, payroll — these are modules a mature ERP has already solved and battle-tested across thousands of companies. Rebuilding that from zero rarely makes sense: it’s reinventing a wheel that already works well.
The hybrid option: the best of both worlds
In practice, many businesses don’t pick one or the other — they combine a standard ERP for the administrative side (accounting, invoicing, payroll) with custom software for the specific operational process of their business, connected to the ERP through integrations.
This approach avoids two expensive mistakes: paying for a full custom build to reinvent accounting, or forcing a genuinely unique process into an ERP module that was never designed for it.
How to decide: the question that actually matters
Before looking at prices or feature lists, ask this question for every process in your business: is this the same as any company our size, or is it one of the things we do differently?
- If the answer is “the same as anyone” → a standard ERP probably solves it better and cheaper.
- If the answer is “we do it differently, and that’s part of what sets us apart” → that’s where custom software delivers real value.
Most businesses don’t need to pick a full side. They need to identify which part of their operation is standard (goes to the ERP) and which part is specific (deserves its own solution).
If you’re not sure which category your process falls into, tell us how you work and we’ll give you an honest assessment — including the option that a standard ERP is simply the right call for your case.