Custom software development in Flanders
Custom software pays off for a Flemish SME where no package covers the process without workarounds, often in the link between Odoo, Teamleader and Exact Online. Crux Digits builds it at fixed prices, and you own the code.
Crux Digits builds the software a standard package leaves out: the link between your ERP and your CRM, the portal your customers use, the step Peppol did not remove. Fixed prices, delivered from the Utrecht region, and you own every line of code.
Last updated: 29 October 2026
Custom software pays when the process is what sets you apart and no package fits it without workarounds. For most Flemish organisations the value is in connecting what already runs, such as Odoo, Teamleader, Exact Online, WinBooks or Octopus, and in automating what Peppol did not: since 1 January 2026 Belgian B2B invoices arrive as structured data, but matching, exceptions and approval are still manual in most companies. Crux Digits works in three fixed steps: an audit at €2,500, a Production-ready MVP at €20,000 and production from €50,000, excl. VAT, with all source code handed over.
From workaround to software
What a custom build replaces
Five steps from the manual workaround to software you own.
The manual workaround
Data typed from one system into another, every day, by someone whose time is worth more.
Systems that talk to each other
Odoo, Teamleader, Exact Online or WinBooks connected through their APIs.
Invoices matched, not typed
Structured Peppol invoices matched to orders and receipts; only exceptions reach a person.
Customers serve themselves
Orders, status and documents in a web portal with the right roles and an audit trail.
Your code, documented
Production handed over with documentation, access and all source code. No licence fee.
Software around the systems you already run
| What runs today | What custom software adds | What you measure |
|---|---|---|
| Odoo or Exact Online as ERP | Order intake from email and PDF, stock and pricing rules the standard modules do not cover | Minutes per order, order errors |
| Teamleader or another CRM | Quotes from standard components, follow-up and project handover to planning | Quote turnaround, quote-to-order rate |
| WinBooks, Octopus or Exact for accounting | Peppol invoices matched to orders and receipts, exceptions routed for approval | Share of invoices booked without touching |
| CODA bank statements | Payments reconciled against open items, differences flagged | Hours of reconciliation per month |
| Spreadsheets and email | A web application with the right roles, audit trail and AI where it saves real time | Time per task, errors, handovers |
Custom applications: portal, planning or integration
A custom application in Flanders is usually one of three things: a web portal where customers or dealers see orders, status and documents; a planning application for engineers, crews or deliveries that your ERP handles badly; or an integration that lets Odoo, Teamleader, Exact Online, WinBooks or Octopus talk to each other. We build them as web applications with the right roles and an audit trail, on the data already in your systems. More on portals: customer portal development; on integrations: API integration.
Custom software next to Odoo, Teamleader and Exact Online
Custom software does not replace your package. Odoo, Teamleader or Exact Online stays the source of your customers, orders and bookings; the custom software reads and writes through their APIs and does the part the standard modules do not cover. Package updates stay possible without breaking the custom work. When extending beats replacing: custom ERP extensions. If the data from those packages first has to come together for reporting or a model, that is work for our data engineering services.
Crux DigitsWhen not to build
If a package does 90% of the job and the rest is a habit rather than a competitive edge, buy the package and change the habit. Custom software is right when the workaround costs more each year than the build, when the process is how you win work, or when the data has to stay under your control. The audit answers that question on your own figures, and it is allowed to conclude that you should not build.
A custom software developer for Flanders
Crux Digits is a Dutch software company from the Utrecht region that builds custom software for organisations in Flanders and Brussels, from SMEs to larger companies. Service area: Flanders and Brussels, delivered from the Utrecht region. Discovery and go-live happen on site; the build runs remotely on a fixed weekly rhythm. We work alongside your IT partner and do not take over your network, workplaces or helpdesk. What we built before is in our published case studies.
Fixed price, your code, delivered from Utrecht
Audit, €2,500: the process mapped, systems and data checked, a scope with a fixed price. Production-ready MVP, €20,000: the core working in your systems, tested with your team. Production, from €50,000: integrated, secured, monitored and handed over with documentation and all source code. Prices excl. VAT; for Belgian businesses the VAT is normally reverse-charged. Discovery and go-live on site in Flanders, the build remotely. Where AI is part of the software, the EU AI Act risk checker shows the duties that come with it. For the AI side see AI consultancy in Flanders; for our full software service see custom software development.
What is included, and what is not
So you can price the gap before a call rather than after one.
In scope
- Integration with the systems Flemish firms run. Odoo, Teamleader, Exact Online or WinBooks through their own APIs, and CODA statements where the bookkeeping needs them.
- Structured e-invoicing that works after the mandate. Peppol invoices arrive as data since 1 January 2026, so the remaining work is matching, exceptions and approval.
- Something working every week. A visible increment you can click, built remotely with discovery and go-live on site.
- The code, models and prompts. In your repository, under your licence, with the documentation. You can hand the whole thing to another supplier and have them continue.
Not in scope
- A Peppol access point. You buy that from an access point provider. We connect your software to it and handle what happens to the invoice afterwards.
- Infrastructure, service desk and systems management. We are an AI partner, not an ICT partner. Your existing supplier or internal team keeps the estate, the workplace and the helpdesk, and we build inside their standards.
Frequently asked questions
Can you connect to Odoo, Teamleader or Exact Online?
Does Peppol make invoice automation unnecessary?
Who owns the software?
Is custom software subsidised in Flanders?
How long does a first version take?
What does custom software cost?
Tell us which workaround costs you most
Book a free consultation. We tell you whether it is worth building, or which package will do.
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