Almost every company that asks us for a custom application has already tried a SaaS product for the same job. Sometimes the SaaS product was the right choice and only needed better setup or an integration. Other times the team had spent two years bending their process around a tool that never fit, paying more per user every year. The decision is rarely about which option is better in general. It depends on how standard the process is, how many people use it, and how much the business depends on doing it differently from competitors.
The Short Comparison
| Aspect | SaaS | Custom software |
|---|---|---|
| Time to start | Days to weeks | Usually a few months for the first version |
| Upfront cost | Low, mostly setup and training | High, the development project itself |
| Running cost | Subscription that grows with users or transactions | Hosting and maintenance that grow slowly with usage |
| Fit with the process | You adapt the process to the product | The product follows your process |
| Data and integrations | Limited to the exports and API the vendor offers | Full control over the database and every integration |
| Who carries the risk | The vendor can change prices, features, or shut down | You own the code but also the upkeep |
When SaaS Is the Better Buy
- The process is the same in most companies, for example accounting, payroll, email, chat, and basic CRM.
- Rules change often because of regulation, such as tax and payroll, and the vendor keeps up with them for you.
- The team is small and the number of users will stay modest for the next few years.
- You need it running this month and there is no budget or time for a development project.
- The vendor has a good API, so the data can still reach your other systems.
For these cases building your own is rarely worth it. A local accounting or payroll product that already follows Indonesian tax rules is cheaper and safer than rebuilding those rules yourself.
When Custom Software Pays Off
- The process is what makes the company different from competitors, such as how you price, schedule, route, or approve work.
- Staff work across three or four tools and copy data between them by hand every day.
- Per-user pricing has become a large monthly cost because hundreds of employees, drivers, or partners need access.
- Customers or regulators require control over where data is stored and who can reach it.
- Workarounds in spreadsheets have grown into a hidden system that only one or two people understand.
Compare Costs Over Several Years
Comparing the first-year price is misleading because SaaS is cheap to start and custom software is expensive to start. Put both options in a sheet covering three to five years. For SaaS include the subscription at the user count you expect in year three, paid add-ons, implementation, the integration work you will still need, and the staff time spent on workarounds. For custom software include development, hosting, monitoring, security updates, and a maintenance budget each year. Many teams use 15 to 20 percent of the build cost per year as a starting estimate for maintenance and small changes.
Also price the exit. Moving off a SaaS product means exporting data, mapping it to a new system, and retraining people. Moving away from a custom system built by a vendor means getting the source code, documentation, and deployment access. Whichever you choose, check how hard leaving would be before you sign.
The Hybrid Route
Many of the projects we deliver are neither pure SaaS nor a full custom build. The company keeps SaaS for the standard parts, such as accounting and HR, and builds a custom application for the part that is unique to them, connected to the SaaS products through their APIs. A distribution company might keep its accounting software and build its own order, delivery, and sales visit application that sends invoices into it. This keeps the custom project small and the standard functions with vendors who maintain them.
Questions to Ask Before Deciding
- 1Write down the process as it runs today, including the spreadsheets and chat messages that fill the gaps.
- 2Mark which steps are standard and which are specific to how your business competes.
- 3Trial the two or three strongest SaaS products with real data and the people who will use them every day.
- 4List what the SaaS products cannot do and decide whether each gap is a real need or a habit that could change.
- 5Get a quote for a custom version of only the gaps and the integrations, and compare it over three to five years.
- 6Check exit terms on both sides: data export for SaaS, and source code ownership and handover for custom work.
Common Mistakes
- Building a custom version of something generic, such as a full accounting system, because one report looks different.
- Choosing SaaS for a core process and then paying for so many add-ons and workarounds that it costs more than a custom build.
- Starting custom development without a maintenance plan, so the system ages until nobody dares to change it.
- Signing with a SaaS vendor whose only export is a PDF report.
Key takeaways
- Use SaaS for standard processes such as accounting, payroll, and email.
- Build custom software for the processes that set your business apart or that connect several tools.
- Compare options over three to five years, including integrations, workarounds, and maintenance.
- A hybrid of SaaS for standard functions and a custom application for the rest is often the cheapest path.
- Check how you would leave each option before you commit to it.
