SaaS or custom software: how to choose
A practical framework for choosing an existing product, building your own, or combining both.
An existing product is a good starting point when it fits the work. Custom software becomes worth considering when a specific workflow is important enough to justify building and maintaining it. A third option is often useful: keep the tools that work and build the missing connection.
The decision is not a contest between buying and building. It is a choice about where your team should spend its attention. Start with the operation you need to support, then compare the alternatives against the same requirements.
Describe the work before the solution
Choose one recurring task and follow it from beginning to end. Who starts it? What information do they need? Who reviews the result? What happens when something is missing? Record the exceptions as well as the usual path.
For example, “we need an operations dashboard” describes a screen. “A supervisor needs to identify visits with missing evidence before approving the daily report” describes a job. The second statement gives you something concrete to test in an existing tool or a prototype.
Compare the same things
| Question | Existing SaaS | Custom software |
|---|---|---|
| Does it fit the workflow? | Test a representative task, including exceptions. | Define the task and the rules you will build. |
| Can it connect to other systems? | Check the actual API, export options and plan limits. | Include each integration in the scope. |
| Who maintains it? | Understand the vendor’s responsibilities and your own configuration work. | Assign responsibility for changes, operations and support. |
| What happens if you leave? | Test how you can export usable information. | Document deployment, dependencies and handover requirements. |
SaaS typically puts application hosting and updates in the vendor’s hands. That does not remove the work of choosing, configuring or integrating it. AWS explains the SaaS delivery model.
Consider a hybrid approach
Illustrative example: a service company already uses software for invoicing and scheduling. Its problem is that approved field visits must be entered twice. Replacing both systems could create more work than it solves. A small integration that passes approved records between them may be enough, provided their interfaces and data rules support it.
The opposite can also happen: a process depends on a distinctive approval flow that no existing product supports well. In that situation, a focused custom application may make more sense than a growing collection of manual workarounds.
Compare the ongoing commitment
Look beyond the first invoice. List subscriptions, configuration, migration, training, integrations, support and future changes. For a custom project, include the people who will operate and maintain the result. For a SaaS product, consider how pricing and access constraints affect the way you use it.
Avoid calculating a return on investment from assumptions that nobody has checked. Start with observable facts: how often the task occurs, who handles it, what gets repeated and which errors require correction.
A brief you can use
Before choosing a direction, write down:
- The task and the people involved.
- What is essential now, and what can wait.
- Existing tools that should stay.
- Data that must move between systems.
- How you will test whether the workflow is better.
- Who will be responsible after launch.
Use this brief to compare one realistic SaaS option with one focused custom scope. If neither is convincing, revisit the problem before adding more features.
We build SaaS products and custom software. That gives the conversation two valid starting points: find a product that fits, or define the part that needs to be built.