Custom software vs off-the-shelf: how to choose

Every growing business reaches the same question: do we add another subscription, or build something of our own? The answer isn't the same for every process in the business. Below is how to separate them, how to compare costs over a few years, and what the contract needs to say. What a custom app costs is in our guide to web app development cost.

The difference at a glance

Neither is better in general. It depends on the process you're trying to fix.

When off-the-shelf is the right choice

Buy, don't build, when:

• the process is the same as everyone's: email, documents, invoicing, accounting, a CRM for a small sales team;
• the legal rules change often: leave accounting, payroll and sales tax to specialised vendors, who track the rules for thousands of customers;
• you need it tomorrow;
• the team is small, so per-user pricing stays small.

When custom software pays off

Build when at least one of these is true:

• The way you work is your advantage. Quotes calculated your way, a production flow your competitors don't have, a client portal that sets you apart.
• Your tools don't talk to each other. The same data gets retyped from one system to another, with mistakes and lost hours.
• Per-user fees grow with the team. At 20 to 50 users the per-seat price adds up, and vendors change their prices: Microsoft 365 Business Standard, for example, went from $12.50 to $14 per user per month on 1 July 2026.
• Nothing on the market does what you need, and the team has started working in spreadsheets around the tool.
• Clients or partners need access too: orders, reports, documents, job status.

Concrete examples of internal tools, from time tracking to a CRM, are in their own guides.

The middle path

Often the right answer isn't "build everything" but off-the-shelf tools, connected:

• an automation that moves data between tools: store orders into invoicing, website enquiries into the CRM; see n8n vs Make vs Zapier;
• a small app on top of your existing tools that does only the missing part: a quote calculator, a reporting dashboard, a client portal;
• off-the-shelf now, with a plan to replace it once you know exactly what you need.

The middle path keeps specialised software where it's strong (accounting, payroll) and builds only what's yours.

How to compare costs over three years

Compared on the first month, a subscription always looks cheaper. Compare over three years instead. An example with round numbers, for a team of 15:

Count what doesn't appear on the invoice too: hours spent copying data between systems, the mistakes that follow, extra tools paid for one feature. With a team of three, the subscription almost always wins. With thirty, run the numbers.

Who owns the code and the data

With off-the-shelf software, your data lives with the vendor. Check whether you can export all of it, in what format, and what happens to it if you cancel.

With custom software, the contract has to say who owns the code. Under the US Copyright Act, software written by an independent contractor usually isn't a "work made for hire", so the contractor owns the copyright, and a transfer of ownership is valid only in writing, signed. Other countries have similar rules. Ask for:

• a written assignment of copyright in everything built for you, on full payment;
• the code in a repository (GitHub, for example) owned by your business, or handed over;
• servers and accounts (hosting, domain, third-party services) in your name;
• enough documentation for someone else to carry on the work.

More on what to ask an agency is in questions to ask a web designer.

Questions to answer before you decide

1. Is this process the same as most businesses', or is it yours?
2. How many hours a week go into copying data between tools?
3. How many users will you have in two or three years?
4. What do your current subscriptions cost over three years, with increases?
5. What could an automation fix without any new software?
6. If you build: who owns the code, and where does the data live?

We build custom web apps for the processes that set you apart, and connect the tools you already use where a new one isn't needed. After the first call you get in writing what it would include, what it costs and how long it takes. Details are on our web development page.