Onelia: quotes and invoices

With Onelia, you do your quotes and invoices at the client's, on your phone or tablet. Back at the office, you find everything on your computer.

You put the quote together in front of the client and they sign it on your screen. In the evening, there is nothing left to retype.

On site, you take your photos and annotate them, mark up your plans or draw a sketch. Everything stays in the project file. At the end of the job, the client signs the job report on your phone.

You send the invoice by email or via Peppol, with your logo and your colour. Since 2026, e-invoicing via Peppol has been mandatory between Belgian businesses, and Onelia sends your invoices in that format. The invoice carries a QR code that your client scans with their banking app to pay. You then see what has been paid and what is still due.

In a basement or a dead zone, the app keeps working without a connection. You do your quotes, job reports and photos, and everything goes out once you are back in coverage. You only need a connection to send an email or a Peppol invoice, and to issue an invoice.

If you work as a team, everyone has their own access and gets their appointments and jobs on their phone. You choose what each person can see and do.

In Onelia you will also find deposits, credit notes, a catalogue of materials and services, stock, purchase orders, stocktakes, the monthly dashboard and much more. Onelia is constantly evolving: new features arrive regularly, and the What's new page in the app shows them to you.

Onelia is made for tradespeople who work on their clients' premises, alone or as a team, in Belgium: plumbers, electricians, heating engineers, tilers, roofers, joiners, painters, landscape gardeners, repair technicians, installers. The app is available in English, French and Dutch.

If you have a question, the question-mark button in the app sends it to us, and the answer arrives in your notifications. Your data is stored on servers in the European Union, with a backup every night.

To use the app, you need an Onelia account. You can create one on the Onelia web portal.