The average small online business uses between 10 and 30 SaaS tools. Email, CRM, analytics, payments, membership platform, support, community, webinars, scheduling, forms — each tool that touches a customer's name, email address, or any other personal identifier becomes a data processor under GDPR. Managing this fragmented landscape is one of the most practical compliance challenges facing online business owners today.
The problem with a fragmented tech stack
When you process customer data across many platforms, several compliance risks emerge simultaneously. First, your privacy policy may not accurately reflect all the places customer data goes — a gap that constitutes a transparency failure. Second, each tool has its own data retention policies, security practices, and breach notification procedures, which you are responsible for understanding and disclosing. Third, when a customer submits a DSAR or requests deletion of their data, you need to be able to locate and action that request across every system that holds their data — not just your primary database.
The practical consequence of a fragmented stack without documentation is that you cannot confidently tell a customer what data you hold about them, you cannot reliably delete a customer's data when requested, and you cannot accurately represent your data practices in your privacy policy. All three of these constitute compliance failures.
What you need to do for each tool you use
For every SaaS tool that processes personal data from your customers, you should:
- Sign a Data Processing Agreement (DPA). Most reputable SaaS providers offer a DPA — sometimes it requires clicking through a form, sometimes it is embedded in their terms. This agreement is required by GDPR when you engage a processor and defines each party's obligations.
- Understand what data the tool receives. Not all integrations send the same data. A Stripe integration might send name, email, and billing address. A Hotjar integration might send IP address and behavioural session data. Know what flows where.
- Check the data location. If the tool is US-based (most are), understand the transfer mechanism in place — Standard Contractual Clauses, adequacy decisions, or binding corporate rules.
- Add it to your privacy policy. Every processor that handles personal data needs to be disclosed to your users.
Keeping track as your stack grows
The most sustainable approach is to maintain a simple internal data register — a spreadsheet or document that lists every tool in your stack, what data it receives, why you use it, where it stores data, and whether you have a DPA in place. This serves as the source of truth for your privacy policy's data processors section and as your starting point for responding to DSARs.
Review this register whenever you add a new tool, remove an existing one, or change how you use an integration. Annual comprehensive reviews catch the gaps that accumulate over time. The few hours spent maintaining this register reduces compliance risk dramatically compared to the alternative: discovering a gap during a regulatory investigation or responding to a DSAR while unsure where all the relevant data lives.