For most small and mid-sized companies, off-the-shelf SaaS is the right choice for the first few years of operation. Custom software pays off in three concrete scenarios: when your process is materially different from what off-the-shelf tools support, when monthly SaaS subscriptions cross €500-€1,000 for tools that cover only part of what you need, and when your competitive edge lives inside a process you don’t want to “fit” to someone else’s tool.
This article breaks down the decision rules, the real five-year cost comparison, and the concrete signals that mean “it’s time for custom.”
The decision in one sentence
If SaaS covers 80%+ of what you need and the subscription is reasonable - stay on SaaS. If it covers less than 70%, or your subscription is growing faster than your business, or your process is part of what makes you different from competitors - it’s time to think about custom.
What SaaS wins on
Off-the-shelf software (Salesforce, HubSpot, Pipedrive, Shopify, Notion, Airtable, and similar) has real advantages:
- Instant availability. Open an account, you’re productive today.
- Low upfront cost. €20-€200/month per user, no large initial investment.
- Professional support. 24/7 chat, documentation, thousands of tutorials.
- Regular upgrades. New features every month, automatically.
- Security and compliance. Big vendors invest millions in security you don’t have to build yourself.
- Integrations. Most SaaS tools have prebuilt integrations with other popular tools.
For most growing companies, SaaS is the optimal choice for the first 3-5 years.
What SaaS loses on
Three serious limitations that show up as the company grows:
1. Process forced into a template. A SaaS tool has its own way of working. If your process doesn’t fit - you either adapt the process to the tool, or live with a half-solution. The more your process is your differentiator, the bigger the problem.
2. Exponentially growing costs. SaaS subscriptions are charged per user or per volume. A company that started with 3 users at €60/month can be paying 30 users × €5 tools = €4,500/month (€54,000/year) a few years in.
3. Vendor lock-in. Prices can jump. Features you rely on can be killed. The service can be acquired and pivoted in a new direction. Your data lives inside their system.
Real five-year cost comparison
Say your company needs an order management tool. Typical scenario:
SaaS approach (Shopify Plus or similar):
- Year 1: €300/month = €3,600
- Year 2-3 (growth, more add-ons): €600/month = €7,200/year
- Year 4-5 (more users, more volume): €1,200/month = €14,400/year
- Five-year total: ~€50,000
- Plus 10-20% of team time spent working around limitations
Custom approach:
- Initial development: €30,000
- Annual maintenance: 15% = €4,500/year
- Hosting and infrastructure: €2,400/year
- Five-year total: ~€60,000
The numbers are comparable, but the custom solution does exactly what you need, with no process adaptation, and no risk of price jumps.
Also: SaaS and custom can be combined. Stay on SaaS for standard things (CRM, email), and build custom only for the part that differentiates you.
Five signs it’s time for custom
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You’re paying over €1,000/month for tools that together don’t cover your process. When Excel spreadsheets, Zapier automations, and manual transfers between tools start piling up, custom consolidates the lot.
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Your best people are spending time “fixing” SaaS. If your ops lead has to manually patch data every month or export reports the SaaS doesn’t offer, the tool costs more than it’s worth.
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Your process is part of what makes you different from competitors. If your advantage lives in how you work, fitting it to an off-the-shelf tool gradually erases that advantage.
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You need integrations the off-the-shelf tools don’t support. Custom can connect everything - from an old ERP to a specific hardware input.
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You’re growing faster than the SaaS plan. When SaaS prices start exponentially growing and you’re entering the “Enterprise” tier, custom often becomes more rational.
The hybrid approach: best of both worlds
Often the smartest move isn’t either/or. Many companies combine:
- SaaS for standard functions: email, calendar, documents, accounting
- Custom for the differentiator: main process, customer-facing interface, market-specific integration
This combination gives you SaaS speed where speed doesn’t create advantage, and custom flexibility where it does.
Frequently asked questions
Can we start with SaaS and move to custom later? Yes, and that’s the most common path. You start on SaaS, learn what you actually need, then build custom once you know what you’re doing. SaaS helps you validate the process before investing in custom.
What if we later want to migrate data from SaaS to custom? Most SaaS tools have data export. Migration is its own small project (€2,000-€10,000 depending on complexity) and is typically planned as a separate step.
Who owns the data? In SaaS: depends on the contract. Most large vendors guarantee export of your data, but the tech is theirs. In custom: everything is yours - code, database, infrastructure, if you want.
How quickly does custom pay back through savings? Typically 18-36 months, depending on scope and how much you’re paying for SaaS now. The calculation is fairly simple: if monthly SaaS savings exceed 1/30 of the custom price, it pays off in less than two years.
Thinking about a switch?
If you’re thinking about moving from SaaS to custom, or the other way around, book a free Discovery call. We help you calculate the real five-year cost of both scenarios and propose a realistic solution - sometimes that means “stay on SaaS for another year,” and sometimes “it’s time for custom.”
Reach out at [email protected] or through the form on our homepage.