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Custom development vs. SaaS tools: when should you build?
Buy an existing product or have a custom solution built? The decision criteria for the leader of a smaller company.
Whenever a software need comes up, the same question returns: buy an existing SaaS solution (software you access online on a subscription) or have a custom tool built? The answer depends on your context.
When SaaS is the right choice
- Standard processes: accounting, payroll, CRM (customer relationship management) – proven solutions cover 80 to 90% of everyday needs.
- Fast deployment: up and running in days, not months.
- Predictable cost: a monthly subscription, no heavy up-front investment.
- Maintenance included: updates, security and hosting handled by the vendor.
When custom development is justified
- A unique business process: the way you work is a competitive advantage that no off-the-shelf product can reproduce.
- Complex integration: making several systems talk to each other when the available connectors are not enough.
- Control over your data: total control over hosting, source code and how the features evolve.
The decision criteria
- Cost over 3 years: SaaS is often cheaper at the start, but can become expensive as you grow (per-user subscriptions).
- Vendor dependence: what happens if the vendor raises its prices or shuts down? Can you export your data?
- Room to evolve: SaaS evolves at the vendor’s pace. Custom development evolves according to your priorities, but it requires resources.
- Data ownership: with SaaS, your data sits with the vendor. With custom development, it sits with you.
A simple decision framework
| Criterion | SaaS | Custom |
|---|---|---|
| Standard process | A good fit | Overkill |
| Differentiating process | A compromise | A good fit |
| Limited budget, immediate need | A good fit | Risky |
| Long-term vision, control | Restrictive | A good fit |
The hybrid approach: often the best answer
In practice, the best-equipped smaller companies combine the two:
- SaaS for support functions: accounting, email, project management.
- Custom development for the core business: the tool that makes your difference.
- APIs (connection interfaces between software) to link the two and move data between them automatically.
In summary
SaaS is the default choice for standard needs. Custom development is justified when it creates a concrete advantage. What matters is deciding on objective criteria – real cost, dependence, room to evolve – and not out of habit or fashion.