A SaaS mobile solution is the right fit when your needs match a standard use case already well covered by the market; a custom app is justified when the user flow is specific to your business, needs to integrate with your tools or gives you a competitive edge. In between, an incremental approach often lets you validate the use case before committing.
On video
Short presentation of Berceau — Dyonysos digital solution — YouTube channel @dyonysosfr · See all DYONYSOS videos
Two different approaches, not just two price points
With SaaS, you rent a product designed for many customers: you benefit from its updates, but you adapt your practices to the way it works. With a custom build, you have a tool built around your processes: you decide how it evolves, but you also carry the maintenance.
So the question to ask is not “Which one is cheaper?” but “Should the way we work adapt to the tool, or should the tool adapt to the way we work?”
When SaaS is the right choice
For widespread use cases such as appointment booking, expense report management, team messaging or simple field forms, proven solutions exist. They can be rolled out quickly, are maintained by the vendor and are sufficient as long as your process stays close to the norm.
SaaS is also a good way to test a need: if the tool is widely adopted and its limitations start to get in the way, you will have concrete arguments for considering a dedicated solution.
- A standard process common to many organizations
- A need for fast rollout
- Few integrations with your internal systems
- No team available to oversee a development project
When a custom build is the way to go
A custom build becomes relevant when workarounds pile up: double entry, manual exports, unused features and missing steps. This is common for field-based business tools, whose user flow depends on very practical constraints such as offline use, fast data entry or specific data to collect.
It is also justified when the app is part of your offering: a consumer-facing service that carries your brand or the mobile extension of an existing platform, where the experience itself is the value.
Assess the total cost over several years
Comparing a monthly subscription with a development quote skews the decision. For SaaS, add up subscriptions over time, the cost of workarounds and the time spent adapting your practices. For a custom build, add maintenance, updates required by mobile operating systems and future enhancements to the initial development cost.
Also assess your dependency: what happens to your business if the vendor changes its offering, or if the provider who built the app is no longer available? Documentation and code ownership are criteria in their own right.
Example: equipping field service teams
Imagine a maintenance company whose technicians fill out paper reports that are later re-entered at the office. A mobile forms SaaS may be enough if the report stays simple: a few fields, a photo, a signature. The decision is then quick and the gain immediate.
If the report depends on the type of equipment, must work without a network connection in basements and feed directly into the internal scheduling tool, the limitations of a generic product quickly become apparent. This is typically where a custom field tool, built around the technician’s actual workflow, becomes more cost-effective than a growing pile of workarounds.
A middle path: validate before you build
Many custom projects become expensive because they start with too many features before the main use case has been validated. An incremental approach reduces this risk: scope the need, prototype the essential flow, test it, then develop in stages while measuring usage.
This is the approach taken by Dyonysos’s Mobile Apps solution, which prioritizes usage and validation before adding more features. It can also help you conclude that an existing SaaS is enough: a well-tested prototype is a good way to find out.
- Scope the need and the main use case
- Prototype and test the essential flow
- Compare the result with available SaaS options
- Develop in stages if there is a real gap
- Measure usage with each release
Frequently asked questions
Answers to the questions we are most often asked about this topic.
Yes, and it is often a good strategy. Using the SaaS reveals your real needs and its concrete limitations. Just make sure you can export your data to make the transition easier.
Not necessarily. An internal app can be distributed in other ways depending on your organization and your devices. For a consumer-facing service, however, being on the app stores remains the expected channel.
Start by describing the users, their context and the main flow, rather than a long list of features. Specify the constraints (connectivity, devices, integrations) and what will be used to judge whether the first version is a success.