Every growing company eventually hits the same wall. Spreadsheets are no longer enough, processes get more complex, employees fight outdated tools – and the search for better software begins.
The question almost always boils down to: buy, rent or build? Or in modern terms: perpetual licence, SaaS subscription or custom development? This article gives an honest, hands-on decision guide – without selling any single option.
What is SaaS, really?
SaaS stands for Software-as-a-Service. You don't buy software, you use it over the internet for a monthly fee. You know the model from daily life: Spotify, Netflix, Dropbox, Slack – all SaaS.
In a business context this means: you sign up, configure the system, and start working immediately. Updates, backups, servers – the provider takes care of all of it. You pay a monthly or yearly fee and (depending on the contract) can cancel any time.
The key difference: with SaaS you don't own the software. You buy a service. That has pros and cons – we'll cover both.
Option 1: Off-the-shelf SaaS
Familiar examples include Salesforce, HubSpot, Lexoffice, sevDesk, Trello, Monday.com or SAP Business One Cloud.
Pros
- Ready to use immediately – sometimes within minutes
- Battle-tested features used by thousands of companies
- Low entry barrier, often a free trial
- Regular updates without your own IT team
- Documentation and community available
Cons
- Your processes have to adapt to the software – not the other way around
- Data often sits on servers abroad (data-protection risk)
- Often too many features no one uses (bloatware)
- Strong dependency on the vendor (vendor lock-in)
- Scaling gets expensive fast (price per user)
- Interfaces to industry-specific systems are often missing
Who is it for?
Off-the-shelf SaaS is ideal when your processes are largely standardised and fit the vendor's feature set. Typical sectors: agencies, consultancies, early-stage start-ups, companies with simple workflows.
Option 2: Custom SaaS development
Here software is built from scratch for your company – with your processes, your industry and your interfaces in mind. The result runs as a web application in the browser, is operated by a service provider and is often billed on a monthly subscription.
Pros
- Tailored to your processes – no compromise
- Full control over features and data
- German servers, GDPR compliant, DPA included
- Interfaces to DATEV, ERP and industry systems are possible
- No unnecessary features – what you don't need isn't there
- Grows with your business
Cons
- Higher upfront investment (development takes time and money)
- Workshop and planning phase needed before development starts
- Some dependency on the developer for changes
- Longer lead time to the first version
Who is it for?
Custom development pays off when your processes are complex or industry-specific, when off-the-shelf software keeps failing, or when you need special interfaces (e.g. DATEV, GoBD-compliant POS, vertical software).
Option 3: Buying your own software (perpetual licence)
The classic model: you buy a software licence once and install it on your computers or servers. Examples include older SAP installations, industry-specific POS systems or local CRM software.
Pros
- One-off payment, no recurring licence fees
- Data stays local with you
- No dependency on internet connectivity (depending on the software)
Cons
- High upfront investment
- Updates often paid or unavailable
- IT infrastructure and maintenance are your responsibility
- No mobile app or browser access on the road
- Security and backups are on you
Who is it for?
This model is recommended less and less. It can make sense for strict compliance requirements, very stable processes and a well-staffed internal IT department. For most SMBs it is no longer the best fit.
Cost comparison: what does each option cost?
| Option | One-off cost | Monthly cost | Typical 3-year total |
|---|---|---|---|
| Off-the-shelf SaaS (small) | €0 – 500 | €50 – 300 / user | €5,000 – 30,000 |
| Off-the-shelf SaaS (Enterprise) | €1,000 – 5,000 | €300 – 2,000 | €15,000 – 80,000 |
| Custom SaaS | €4,900 – 39,000 | €99 – 499 | €9,000 – 60,000 |
| Perpetual licence + IT ops | €5,000 – 50,000 | €200 – 1,500 (IT/maintenance) | €15,000 – 100,000 |
Note: All figures are indicative. Actual cost depends heavily on scope, user count and requirements.
Decision tree: the four key questions
Answer these four questions – the answers will show which option fits you:
- Are your processes standardised? If yes → consider off-the-shelf SaaS. If no → custom development.
- Do you need specific interfaces? (DATEV, vertical software, GoBD-compliant POS) If yes → custom development or specialised off-the-shelf SaaS.
- Is your user count growing fast? Off-the-shelf SaaS gets expensive per user quickly – custom development often has flat pricing.
- How strong is your in-house IT? Little IT internally → SaaS (no server ops). Strong IT → perpetual licence with own ops can work.
Our take
Most small and mid-sized businesses in Germany benefit most from customised SaaS solutions: the entry barrier is manageable, processes are properly mapped, German servers and GDPR are standard, and monthly costs stay predictable.
Off-the-shelf SaaS makes sense when requirements are clear and simple. Perpetual licences are outdated for most SMBs. And if you really have unique, industry-specific processes, custom development is – despite the higher upfront cost – the economically smarter choice.
Not sure what fits you? A free 30-minute call brings clarity. We listen, understand your situation and recommend what really suits you – honestly and without pressure.