July 27, 2026 · Lubomír Nedbal

How to Replace Excel with a Custom Business App

Excel is a great tool — up to a point. Almost every company I talk to has at least one “important spreadsheet” that part of the business runs on: order records, shift planning, inventory, commissions. And almost always with the same problems.

Signs Excel is no longer enough

• ›Several people edit the spreadsheet at once and overwrite each other's data.
• ›Five versions of the file exist and nobody knows which one is current.
• ›Only one person understands the formulas — and they're on holiday.
• ›Data is manually retyped between the spreadsheet, email and accounting.
• ›No change history: you don't know who changed what and when.
• ›Sensitive data (prices, salaries, contacts) is visible to anyone with the file.

If you nodded at two or more points, the spreadsheet no longer solves a problem — it is the problem. The time your team spends maintaining it and fixing errors usually far exceeds the cost of a proper solution.

What replacing Excel looks like

This isn't about building a “big system”. A custom business app is typically a simple web application everyone signs into from their computer or phone, seeing exactly what they should see. One version of the truth, role-based permissions, change history, and automation of the routine — automatic invoicing, deadline tracking, or an accounting integration.

Typical real-world examples

• ›Order tracking for a construction or trades company — status, deadlines, site photos, who's working on what.
• ›A simple CRM — customers, enquiries and communication in one place instead of in inboxes.
• ›Shift and capacity planning — instead of a spreadsheet someone assembles by hand every Monday.
• ›Inventory and materials — stock in, stock out and current levels in real time.

What it costs and how long it takes

A first working version that replaces the most painful spreadsheet usually fits within CZK 150,000–400,000 and 4–8 weeks of development. There's no big bang: the app first runs alongside Excel, the team gets used to it, and only then is the spreadsheet retired. Your Excel data gets imported — no history is lost.

How to proceed

• ›Pick the one spreadsheet that hurts the most — not all of them at once.
• ›Write down who works with it and what each person does in it (bullet points are fine).
• ›Get a first-version proposal and a fixed price — with me, this consultation is free.
• ›After 4–8 weeks you have an app your team actually uses, and clarity on what to build next.