GDPR Compliance Checklist for Apps and SaaS Platforms Serving EU Users

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A practical GDPR compliance checklist for SaaS platforms and app developers. Covers data mapping, consent, privacy policies, DPAs, and user rights obligations.

If even one of your users is based in the European Union, the General Data Protection Regulation applies to your business. It does not matter that your company is based in the US, or that you are a small startup, or that you never thought about European data law when you built your platform.

GDPR is extraterritorial. It follows the user, not the company.

The good news is that compliance is achievable. It requires planning, documentation, and the right technical setup, but it is not out of reach for early-stage teams. This checklist covers what most SaaS platforms and app developers need to address.

Step 1: Know What Data You Collect and Why

Before you can document compliance, you need to understand your own data flows. This is called a Record of Processing Activities (ROPA), and Article 30 of GDPR requires most organizations to maintain one.

Your data map should answer:

• What categories of personal data do you collect? (Names, emails, IP addresses, usage behavior, payment info, device data)

• Where does that data come from? (Users, third-party integrations, analytics tools)

• What do you use it for?

• Who do you share it with? (Third-party processors: Stripe, Intercom, Google Analytics, etc.)

• Where is it stored, and in which country?

• How long do you keep it?

Most startups that go through this exercise for the first time are surprised by how many data flows they have and how many third parties are processing their users' data.

Step 2: Establish a Legal Basis for Each Processing Activity

GDPR does not just say you must protect data. It says you must have a documented legal reason to process it. There are six possible legal bases, but three are most relevant to SaaS platforms:

• Contractual necessity: You need the data to deliver the service the user signed up for (account creation, billing).

• Legitimate interests: You have a genuine business reason that does not override user rights (security logging, fraud prevention, product analytics). This requires a documented Legitimate Interests Assessment (LIA).

• Consent: The user has actively agreed to the specific processing activity (marketing emails, optional analytics). Consent must be freely given, specific, informed, and withdrawable.

Using the wrong legal basis, or using consent when it is not needed, creates compliance exposure. Consent is the hardest basis to maintain because users must be able to withdraw it easily and you must stop processing when they do.

Step 3: Update Your Privacy Policy

Your Privacy Policy is the primary document through which you fulfill GDPR's transparency requirements. Under GDPR Articles 13 and 14, you must inform users at the point of data collection about:

• Your identity and contact details (and your DPO if applicable)

• The purposes and legal bases for each processing activity

• Any third parties or international transfers

• Retention periods for each data category

• User rights (access, rectification, erasure, portability, objection, restriction)

• The right to lodge a complaint with a supervisory authority

A generic privacy policy template will not satisfy these requirements because it cannot reflect your specific data practices. The policy must be accurate, current, and written in plain language.

Step 4: Fix Your Cookie Consent

This is one of the most commonly violated areas of GDPR, and one of the most frequently audited.

Compliant cookie consent requires:

• No non-essential cookies to be set before the user gives consent

• A consent mechanism that is genuinely opt-in (pre-ticked boxes are not valid)

• Equal prominence for Accept and Reject options

• A granular consent interface for different cookie categories (analytics, marketing, functional)

• A mechanism for users to withdraw consent as easily as they gave it

Most cookie banners you see in the wild fail at least two of these requirements. If your current setup pre-loads Google Analytics before consent is given, you are already non-compliant.

Step 5: Sign Data Processing Agreements with All Processors

Every third-party tool that processes personal data on your behalf is a data processor. GDPR Article 28 requires a signed Data Processing Agreement (DPA) in place with each one.

The major tools have standard DPAs available: Stripe, AWS, Google, Intercom, HubSpot, and others will provide these on request or via their compliance portals. You need to actually execute them, not just assume they exist.

For your own B2B customers, you also need to be able to provide a DPA when asked. Enterprise sales processes in the EU will almost always require this before contract signature.

Step 6: Build a Process for Handling User Rights Requests

GDPR gives users specific rights they can exercise at any time:

• Right of access: users can request a copy of all data you hold on them

• Right to erasure: users can request deletion of their data

• Right to rectification: users can request correction of inaccurate data

• Right to portability: users can request their data in a machine-readable format

• Right to object: users can object to processing based on legitimate interests

You have one month to respond to most requests. You need a documented process for receiving, verifying, and fulfilling them, and a way to actually locate and delete user data across your systems and third-party processors when required.

Step 7: Address International Data Transfers

If your servers are in the US and you have EU users, you are making an international data transfer. Since the invalidation of Privacy Shield in 2020, this has been a significant compliance area.

The current approved mechanism for US-EU transfers is the EU-US Data Privacy Framework (DPF), which replaced Privacy Shield in 2023. If you use US-based processors (AWS, Google Cloud, etc.), verify they are DPF-certified or that your contracts include Standard Contractual Clauses (SCCs).

Step 8: Document Everything

GDPR operates on a principle of accountability. You do not just need to be compliant, you need to be able to demonstrate compliance. This means keeping records of:

• Your ROPA (data map)

• Consent records (when consent was given, for what, and by whom)

• DPAs with processors

• User rights requests and how you responded

• Any data breach incidents and your response

If a supervisory authority ever investigates your platform, documentation is your evidence of good faith.

Common Mistakes SaaS Platforms Make

• Treating GDPR as a one-time project rather than an ongoing compliance function

• Using a privacy policy that does not match their actual data practices

• Failing to update compliance documentation when they add new third-party tools

• Ignoring GDPR because they are based outside the EU

• Assuming a cookie banner equals full cookie compliance

Not sure where your GDPR compliance gaps are?

TECHLAWG works with SaaS platforms and app developers to build practical, complete GDPR compliance programs. We identify your risks, prepare your documentation, and ensure your data practices match your policies.

Book a free consultation and speak to one of our experts.