Custom Software or Off-the-Shelf SaaS? A Decision Guide for Growing Businesses

Most growing businesses reach a point where the spreadsheets, WhatsApp groups and three or four subscriptions that got them here start costing more time than they save. The question is whether to buy another off-the-shelf product or have software built around the way the business works. The honest answer is that SaaS is right for most things, and custom software is right for a few specific ones.

When is off-the-shelf SaaS the better choice?

Buy rather than build when the process is standard and does not set you apart. Accounting, payroll, email, video calls, generic project management and most HR tasks work the same way in thousands of companies, and mature products already do them well.

• You need it working this month. A subscription can be live in days.
• Your process matches the product. If you would not change the way the tool works, there is nothing to customise.
• Few users. Per-seat pricing is cheap when the team is small.
• Compliance is the vendor’s job. Products such as tax and payroll software keep up with regulation changes for you.

When does custom software pay off?

Build when the software is part of how you compete, or when stitching products together has become the bottleneck.

• Your workflow is your edge. A boutique that handles alterations, tailoring and multi-outlet stock, or a café that runs QR ordering, kitchen display and inventory as one flow, often finds generic tools force it into someone else’s process.
• Too many tools that do not talk to each other. When staff re-key the same data into three systems, errors and delays compound. One system with one database removes the hand-offs.
• Per-seat costs keep climbing. Subscriptions grow with every user, every year. Software you own costs you hosting and maintenance, not a fee per person.
• You need to own your data and code. Some businesses must keep data in a particular country or on their own servers, or want an asset they can extend without a vendor’s permission.
• You want to sell it. Many of the products we build, such as a stays marketplace or an e-signature app, are themselves the business.

What does the real cost comparison look like?

Compare the total cost over three to five years, not the first invoice. For SaaS, that is the subscription times users times years, plus integration tools, plus the staff time lost to workarounds. For custom software, it is the build, plus hosting, plus ongoing maintenance and improvements, which usually run every year the software is in use. Custom software is rarely cheaper in year one; it can be cheaper by year three when many people use it every day.

Is there a middle path?

Yes, and it is often the best one. Keep standard products for standard jobs, and build only the part that is specific to you, connected to the rest through their APIs. A custom order-and-production system that posts invoices into your existing accounting software is a common example.

How do you start a custom build without a big risk?

1. Scope one module first. Pick the process that costs the most time today, and agree in writing what the first version does, what it costs and how long it takes.
2. See clickable screens before code. Testing the design with the people who will use it catches most misunderstandings cheaply.
3. Build in short cycles you can review. You should see working software every couple of weeks, not one big reveal at the end.
4. Own the source code and documentation. Make sure the contract gives you the code, the deployment setup and enough documentation that another team could take over.
5. Plan for support after launch. Budget for fixes, small improvements and security updates from day one.

Questions to ask a software development partner

• Who exactly will design and build it, and can I talk to them directly?
• Will I get a written scope and estimate before work starts?
• Who owns the source code, and where will it be hosted?
• How will I review progress, and how often?
• What happens after launch: response times, costs and who does the work?
• Can I see live products you have built for similar problems?

Frequently asked questions

How long does a custom business system take to build?

It depends on scope. A focused first version of one module is a matter of weeks; a platform covering several departments is built and released in stages over months. A written scope is the only reliable way to know.

Can custom software work alongside the tools we already use?

Usually yes. Most accounting, payment, messaging and e-commerce products have APIs, so a custom system can read from and write to them instead of replacing them.

You can see examples of what we have built, from an ERP for fashion retail to a stays marketplace, on our work page, or tell us about the process you want to fix.