Business software Custom business software

Planning, work orders, quotes and invoicing in one system. With OneOS as the base, or fully custom.

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Free first conversation
Fixed price up front
Answer within 2 working days

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In short

Custom business software brings scheduling, work orders, quotes and invoicing together in one system. Sitects builds it with OneOS, our own platform for service companies, as the foundation, or fully custom if your operations call for it.

What you get with business software

Everything in one place From enquiry and quote to scheduling, work order and invoice.
A schedule that adds up Your team sees who does what and when.
Work orders on the phone Your technician fills in the work order on site, with photos, materials and signature.
Invoicing via Peppol Ready for mandatory e-invoicing between Belgian businesses.
OneOS as the foundation Start quickly with our own platform, and expand where needed.
Connected to your website Enquiries from your website go directly into your schedule.

Who is custom business software for?

You currently work with Excel, paper and separate programs.
Your technicians call the office to report what they have done.
You still invoice from Word or Excel and need to be ready for Peppol.

Why business software from Sitects?

OneOS is our own business software for service and call-out companies with 5 to 50 employees. That means you do not start from scratch. Whatever OneOS does not do as standard, we build on as custom work, and we connect it to your website so enquiries come in by themselves.

Is this right for your business?

Tell us in a few sentences what you need. You get an honest answer within 2 working days, even if something else suits you better.

Discuss your project See our work

How we work

From first conversation to launch.

1
Free introduction
We look at how things run today and what your customers need.
2
Proposal with a fixed price
You get scope, price and planning on paper before we start.
3
Design first, then build
You see the main screens before we build, and test every step along the way.
4
Live, and we stay
After launch we take care of hosting, maintenance and extensions.

Frequently asked questions about business software

How much does custom business software cost?

That depends on whether you start with OneOS or have it built fully custom, and on the number of users. After a free first conversation you get a proposal with a clear price and a schedule.

What is OneOS?

OneOS is our own business software for service and call-out companies with 5 to 50 employees. Enquiries, quotes, scheduling, work orders and invoicing via Peppol are in one system.

Can our technicians fill in work orders on their phone?

Yes. The technician fills in the work order on their phone or tablet, with photos, materials and the customer's signature. The work order goes straight to the back office and can be invoiced.

Are we ready for the Peppol obligation?

Since 1 January 2026, electronic invoicing between Belgian businesses has been mandatory. If you invoice from Word, Excel or a package without a Peppol connection, you are not ready for it yet. Together we look at the quickest route: OneOS, an integration or something custom.

Can the software be connected to our accounting?

Yes. Invoices and customer data flow through to your accounting package, so your accountant does not have to retype anything.