Excel & VBA applications
Bespoke work for calculations, quotes, planning and reporting, with careful attention to a robust design and clear input validation.
More about Excel & VBA developmentAn Excel file your process depends on, but nobody dares to change any more?
We work out how it runs, write it down and carry on building with care. We have been doing this for more than thirty years. We also build new Excel and VBA applications from scratch.
Discuss your project
How we work
A first conversation costs nothing · reply within one working day
30
years of Excel and VBA experience
600
clients helped, from SME to corporate
1
single point of contact, from intake to handover
Services
What we build
From a single workbook that keeps breaking to an application your whole department relies on.
Google Sheets solutions
The same precision as in Excel, but in the browser and instantly shareable with your team.
More about Google SheetsCustom web applications
If Excel no longer fits: the same logic, but as a web application with a database underneath.
More about web applicationsProject takeover
The person who built your Excel or VBA application has moved on, and no one dares touch the file? We take over existing applications, get to grips with them, and build on from there.
More about project takeoverAI-assisted development
Where AI demonstrably solves an Excel or VBA problem faster or better, we use it deliberately.
More about AI-assisted development
How we work
Four steps, clear agreements
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Intake
We look at your existing file or process together. We'll tell you straight away what's possible and give you a rough idea of the cost.
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Analysis and proposal
A concrete proposal with scope, a target timeline and a cost estimate. If the work departs from that proposal — for example through additional work — you hear about it in advance, not afterwards.
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Building and testing
You see working versions along the way, so we can adjust course before it's finished.
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Handover and maintenance
Documentation, a walkthrough for your team, and a point of contact for when something changes.
How we build
Thirty years of ExcelSpecialist, with today's tools
We build with AI assistance, within our own development standards: fixed rules for generation, validation and delivery. That can save lead time, especially when taking over existing applications; how much depends on the file. Control, validation and responsibility stay with people, and where you prescribe your own systems or approvals, we develop within them. The data in your application is and remains yours.
How we work →
Trust
Worked for organisations you know
A handful of the organisations we've worked with; the full list is on the references page.
- ABN-Amro
- Randstad
- Malmberg
- ASR Vastgoed
- DSM
- KPN
Continuity
The same craftsmanship, now continued by Dennis
ExcelSpecialist was built up by Ruud Coopmans. Dennis Spoelder has known Ruud since 2008, has worked closely with him ever since, and carries ExcelSpecialist forward with the same practical, approachable way of working existing clients know. Ruud remains involved in the background.
Read the story of Ruud and Dennis
Contact
Go to the contact form
Get in touch about your project
Looking for Excel help? Briefly describe what you're dealing with, and Dennis will reply within one working day.
A first conversation costs nothing · reply within one working day