When a company asks us about custom software, the first thing we do is try to convince them they don't need it. It sounds odd coming from a development company, but it's the most honest way to start: if an off-the-shelf product or a well-configured open-source ERP solves your problem, it's cheaper, faster and safer. Custom software pays off in specific cases, and when it does, it pays off handsomely.
In this guide we explain what it is, when it makes sense, what it costs and what you should demand from any development company, including ours.
What is custom software?
Custom software (also called bespoke software or custom development) is an application designed and built specifically for one company, based on how it works, the data it handles and what it needs to achieve. The alternative is off-the-shelf software (or packaged software): a ready-made program you buy or rent and adapt your processes to.
Examples of custom software we've built for SMEs: a construction project management platform for a builder, with real-time costs and profitability per project; a customer portal for an insurance brokerage with 9,000 policyholders; an AI agent that reads customer orders, validates them and records them in the ERP; and dashboards that bring together sales and cash flow for the four companies in a group.
Custom software vs off-the-shelf software: an honest comparison
| Off-the-shelf software | Custom software | |
|---|---|---|
| Fit with your process | The company adapts to the software | The software adapts to the company |
| Time to get started | Days or weeks | Weeks or months, in phases |
| Upfront cost | Low or none | Upfront investment |
| Recurring cost | Per-user licenses, forever | Maintenance; no licenses |
| Integration with other systems | Whatever the vendor allows | Whatever you need |
| Ownership and dependency | The vendor's | You own the code |
| Evolution | Follows the vendor's roadmap | Follows your needs |
When does custom software pay off?
- The way you work is your advantage. If what sets you apart is how you handle orders, quotes or service, an off-the-shelf product forces you to work like everyone else.
- No off-the-shelf product covers the process without workarounds. You'll recognize it because you use three programs, four Excel spreadsheets and a lot of copy and paste.
- You need to connect systems. ERP, online store, carriers, banks, marketplaces, suppliers. Integrations and APIs are almost always custom development.
- You pay licenses for things you don't use. If 40 users pay for a program they only use two screens of, custom software pays for itself quickly.
- You want to serve your customers with a portal, an app or a tool that off-the-shelf software doesn't offer.
- Automating something repetitive and specific, as in these 12 administrative tasks, usually requires in-house development, even if it's small.
When it does NOT pay off
- For standard processes where you don't stand out: accounting, payroll, email, office tools.
- When an open-source ERP such as Dolibarr or Odoo, properly configured, already covers 90% of what you need. The smart move then is to implement it and build only the remaining 10% as custom development.
- When the process isn't clear yet. Custom-coding a process that changes every week is throwing money away: sort it out first, then build it.
- When the budget isn't enough to do it properly or to maintain it. Better an off-the-shelf product that works than a half-finished custom one.
For most SMEs the best answer isn't "off-the-shelf or custom" but "off-the-shelf where you don't stand out, custom where you do."
The hybrid model: an open-source ERP plus development where it adds value
It's what we do in most projects. We start from an open-source ERP (Dolibarr, Odoo, ERPNext) that handles customers, invoicing, inventory and accounting, and we custom-build the modules, integrations or portals the company really needs: a product configurator, a portal where subcontractors upload work reports, a connection to the carrier, a dashboard for management. The result costs as much as a well-scoped development project and is as solid as a system used by thousands of companies.
How much does custom software cost?
It depends on the scope, but you can narrow it down using Spanish market benchmarks for professional work:
- Simple internal tool: define the form, dashboard or automation you need.
- Business web application: specify the user profiles, permissions, dashboards and ERP integration.
- Full platform: split the portal, SaaS or marketplace into phases and define its integrations and operating requirements.
Maintenance should cover incidents, updates and ongoing evolution. Ask for the proposal to spell out what it covers and the terms for adding new features.
What to demand from a custom software development company
- Upfront analysis with your team, not a blind quote.
- A fixed proposal: scope, price and timelines in writing.
- Phased delivery with demos, so you see real progress and can correct course in time.
- You own the code and the data, with repository access from day one. No hidden licenses.
- An in-house team you talk to directly, no middlemen.
- Support and maintenance from the same team that built it, with defined response times.
- Enough documentation for another team to take over tomorrow.
How we approach custom software at Interconecta
We look at how your team works and where time or money is being lost. Then we propose the simplest solution that fixes it: sometimes that's configuring an ERP, sometimes it's a custom web application, and almost always it's a mix. We develop in phases, with demos every one or two weeks, a fixed-price proposal and 100% of the code owned by you. If you'd like to know what we'd do in your case, tell us: the analysis is free and with no obligation.
Does your company adapt to the software, or the software to your company?
We'll analyze how your team works, free of charge, and tell you whether your needs are best met with off-the-shelf software, an open-source ERP or custom development, and what it would cost.
Talk to Interconecta