The hidden costs of building on a third-party platform

It always starts the same way. A brand needs speed. An existing platform offers a ready-made solution. The first campaign or product goes live in weeks. Everyone is happy.

Two years later, the story has changed. Features you need are unavailable. The integration with your CRM is half-broken. Prices have gone up. Migrating costs more than you have ever paid in total. And your data sits locked inside a system you do not control.

At Livewall, we see this pattern often. Not because third-party platforms are bad, but because the real costs only become visible once it is too late to pivot easily.

The costs that do not appear in the proposal

The licence fee is the least interesting number. The real costs come from three other places.

Feature limitations. Every platform has boundaries. Those boundaries exist so the platform stays scalable for hundreds of customers at once. Your specific needs do not always fit inside them. Workarounds cost development time. Sometimes they are simply impossible.

Integration costs. Your existing stack rarely works seamlessly with a new platform from day one. API connectors, middleware, sync issues: every integration adds fragility and ongoing maintenance. The more you integrate, the deeper the dependency.

Switching costs. This is the most underestimated line item. Data export, team retraining, parallel operation during migration, rebuilding logic that was baked into the old system. For large platforms, a migration typically takes 6 to 18 months and costs three to five times the annual licence fee.

Add to that: the opportunities you miss because the platform does not support something your competitors can do with a custom-built approach.

When custom is genuinely the better choice

This is not an argument against SaaS platforms. For standard processes, they are excellent. CRM, email marketing, analytics: use what exists.

But there are situations where the balance structurally favours building your own.

When the user experience is your product. A loyalty programme, a community platform, an interactive campaign environment: here the experience is the core of the value proposition. A generic platform produces a generic experience. That is rarely enough.

When your data must be yours. With custom web application development you decide where data lives, how it is structured, and who has access. No vendor can change their data policy and take your intelligence with them.

When long-term speed matters. A custom application you fully understand is faster to adapt over time than a platform whose roadmap you do not control. Custom builds cost more upfront. But total cost of ownership over three to five years is often comparable or lower.

The questions worth asking upfront

Before choosing a platform or going custom, four questions make the difference.

How unique is what you want to build? If ten other companies do the same thing on the same platform, the platform is probably fine. If your use case is specific, you are paying for functionality the platform will never fully support.

How long will you use this? For a six-week campaign, switching costs are irrelevant. For a platform that needs to last three years, they become decisive.

How critical are the integrations? The more connections you need to your existing stack, the greater the risk of accumulating technical debt.

Who manages this long-term? Platforms require internal management, configuration, and knowledge. Those costs are consistently underestimated.

What we see working at Livewall

At Livewall, we build digital products and web applications for brands that recognise their digital experience needs to be distinctive. We do not default to custom because it is what we sell. We make the trade-off every time.

For the KLM Scalable Growth Case, we built a custom AI-driven workflow system that scales campaign production across 50+ markets. No generic platform could have done that.

For the AvroTros Eurovision voting app, the requirements included real-time voting, social group mechanics, and peak loads of hundreds of thousands of concurrent users. The app reached number one in the App Store. That required its own technical architecture, not a template on top of a third-party product.

That does not mean we never recommend a platform. It means we always base the recommendation on the specific situation.

How to structure the decision

An honest cost comparison between platform and custom should look at:

• Total cost of ownership over three years: licence + integration + internal management + customisations
• Limitation costs: what does it cost when the platform cannot do something your competitor does?
• Migration optionality: how easy is it to switch in two years if your situation changes?
• Data sovereignty: who owns the data and what happens if the vendor changes their policy?

Platforms are not a bad choice. They are a choice with consequences you need to understand upfront. The brands that do this well start with strategy, not a shortlist of tools.

Our recommendation: run digital strategy before you pick a platform. Understand what you want to build, for whom, and for how long. The tool decision becomes much simpler after that.