It happens quietly. You roll out a new SaaS tool because it removes work right away. After six months everyone uses it. After two years all your customers, jobs, templates and processes live in this system. Then the vendor raises prices by 30%. You consider switching – and find out it would take six months to migrate everything to another system. You pay the increase.
That is vendor lock-in. And it is one of the most underestimated risks in the digital transformation of mid-sized businesses.
What exactly is vendor lock-in?
Vendor lock-in describes the situation in which a software switch becomes so expensive – economically or technically – that it effectively never happens. There are several causes:
- Data lock-in: your data can't be exported, or only incompletely
- Process lock-in: employees are trained on the system; retraining would be costly
- Interface lock-in: other systems (DATEV, inventory, POS) are connected via this one
- Contract lock-in: long notice periods and automatic renewals
- Knowledge lock-in: configurations and workflows are documented nowhere
How vendors (sometimes intentionally) reinforce lock-in
Not every vendor acts maliciously – but many business models benefit from switching being painful. Typical mechanisms:
Proprietary data formats
Data exports are possible, but only in formats no other system can read. Or important relationships (e.g. between customers and orders) are missing from the export.
Features only in higher tiers
Classic: data export in open formats is only available in the "Enterprise" licence – which costs twice as much. You pay for the option to leave.
Own marketplaces and add-ons
The more third-party features you buy from the vendor's marketplace, the harder a switch becomes. Each add-on must be replaced separately.
Long contract terms
Some vendors offer 12-month contracts with an "attractive discount" – really it's just a way to control the switch timing.
Lock-in is not an accident – it is often part of the business model. Fair vendors make it easy to leave and keep customers anyway, because they do good work.
Six measures to avoid lock-in
1. Test data export before signing
It sounds trivial but is rare: before deciding on a SaaS tool, ask the vendor for a complete sample export. Check: are all fields included? Are relationships preserved? Can the file be opened in Excel or another system? A good vendor will show this without hesitation.
2. Demand open interfaces
Look for an open REST API with documented endpoints. That means you can connect your own tools, build your own analytics or push data to other systems – even if the vendor doesn't actively support it.
3. Contracts with short notice periods
A 12-month minimum term is fine – but after that monthly cancellation should be possible. Reject auto-renewals over twelve months. Negotiate this before you sign, not after.
4. Maintain your own documentation
Write down how you have configured the system. Which workflows run? Which fields are used for what? Which integrations are active? This documentation is the basis for any switch – and is also valuable for new employees.
5. Run regular data exports
At least once per quarter: pull a complete data export, store it in safe storage, verify it is complete. In an emergency you always have a fallback – and no sleepless nights if the vendor stops operations tomorrow.
6. For strategic systems: examine the ownership model
For software that is central to your business (CRM, accounting, order processing) a custom SaaS development with an ownership model can pay off. You receive the source code, can – if needed – run the system yourself or via another provider, and are never in a position to be squeezed.
How Klarspur prevents lock-in technically
In every Klarspur project a few ground rules apply, which we also document and contractually guarantee:
- Data is stored in an open PostgreSQL database (no proprietary format)
- A complete REST API with OpenAPI documentation is available by default
- Data export in CSV, JSON and PDF is possible at any time at the click of a button
- Code hosting in a Git repository that, on request, transfers to your ownership
- Contract term 12 months, then monthly cancellation
- On cancellation: complete data + 90 days of transition access
Special case: Microsoft 365, Google Workspace & co.
For truly large platforms (email, office, storage) lock-in is practically unavoidable – but the risk is manageable, because competitors must adhere to open standards. Emails can be migrated, office files are largely compatible, cloud storage can be mirrored.
Caution is especially warranted for industry-specific platforms: practice management, legal software, POS systems, manufacturing MES. Here the vendor pool is small, the switching effort is huge – and that's exactly where a second look at custom solutions pays off.
Conclusion
Vendor lock-in does not arise overnight, but creeps in. Anyone who pays attention to data export, open interfaces and fair contract terms from day one has significantly more negotiating power later. For strategically important systems the move to a custom SaaS solution with real ownership often pays off – not because a switch is planned, but because the option to switch is the only effective protection against price hikes.
Want to check how deep you are already in lock-in? We offer a free 30-minute analysis: which systems do you use, how complex would a switch be, when do which contracts expire.