Free GDPR-Compliant Analytics: Clarity vs PostHog (2025)

Analytics can tell you what visitors actually do on your site, but the General Data Protection Regulation (GDPR), in force since 2018, puts strict limits on how you collect and process personal data from EU residents. Tools that ignore those rules are a fine and a trust problem waiting to happen. This post compares free, GDPR-compliant analytics options, mainly Microsoft Clarity and PostHog, then covers open-source self-hosted alternatives with their licenses, so you can pick one that fits your setup while keeping user data protected.

The GDPR sets standards for protecting personal data. Analytics tools must:

Obtain user consent: Explicit permission before collecting data, often via cookie banners.
Minimize data collection: Gather only necessary information.
Secure data handling: Use encryption and solid security measures.
Support user rights: Allow data access, deletion, or opt-out options.

Non-compliant tools, like Google Analytics, often need complex configurations, which pushes people toward inherently GDPR-compliant alternatives. The free options below balance functionality and privacy.

Microsoft Clarity: free behavioral analytics

Microsoft Clarity (Clarity) is a cloud-based, free tool that tracks user behavior with session replays, heatmaps, and AI-powered analytics. Microsoft states Clarity is GDPR-compliant as a data controller and processes data per privacy regulations. Since Clarity uses cookies, though, website owners must inform users and provide opt-out options via a cookie banner.

Key features

Session recordings: Replay user interactions to identify navigation issues.
Heatmaps: Visualize clicks, scrolls, and attention areas.
AI summaries: Summarize user behavior for quick analysis.

Setup

Sign up at Clarity, add your website, and insert the tracking code into your site’s HTML. Implement a GDPR-compliant cookie banner to inform users about data collection.

Pros and cons

Pros: Free, intuitive interface, solid behavioral reports.
Cons: Requires consent mechanisms, data stored on Microsoft servers, limited integrations.

Microsoft covers data minimization and transparency, but website owners still have to handle consent and opt-out processes themselves to fully comply with GDPR.

PostHog: versatile analytics with free and open-source options

PostHog (PostHog) is a single platform for product analytics, session recordings, feature flags, and A/B testing. It has a free cloud tier (up to 1 million events monthly) and an open-source self-hosted version. For GDPR compliance, PostHog offers EU hosting in Frankfurt, so data stays within the EU, plus consent management and data anonymization tools.

Key features

Product analytics: Track events and build custom reports.
Session recordings: Analyze user interactions in detail.
Feature flags: Roll out features selectively.
Surveys: Collect direct user feedback.

Pricing and setup

The cloud version is free for up to 1 million events monthly. Sign up at PostHog and follow the integration guide. The open-source version, licensed under the MIT License, can be self-hosted using Docker (PostHog Docs).

Pros and cons

Pros: Full feature set, EU hosting, open-source flexibility.
Cons: Self-hosting needs technical skills, free cloud tier has event limits.

PostHog’s EU hosting and privacy tools support GDPR compliance, provided users implement consent mechanisms and avoid collecting data they do not need.

Open-source self-hosted alternatives

Open-source, self-hosted analytics tools give you full control over your data, which fits GDPR requirements well. The five options below include their licenses, features, and compliance measures.

1. Matomo

License: GNU General Public License (GPL) v3.0 (Matomo License FAQ)
Description: An open-source web analytics platform used by over 1 million websites, with features similar to Google Analytics.
Features: Real-time analytics, e-commerce tracking, customizable dashboards, IP anonymization, and opt-out options.
GDPR Compliance: Supports data anonymization, consent management, and self-hosting to keep data on your servers.
Setup: Install on a PHP/MySQL server (Matomo Installation).
Pros: Full-featured, trusted by major organizations, full data ownership.
Cons: Setup requires technical expertise, UI may feel dated.

2. Plausible Analytics

License: GNU Affero General Public License (AGPL) v3.0 (Plausible License)
Description: A lightweight, privacy-focused alternative to Google Analytics, built around simplicity and GDPR compliance.
Features: Tracks unique visitors, page views, and referrals without cookies or personal data.
GDPR Compliance: Collects no personal data, which usually removes the need for consent banners; an EU-hosted cloud option is available.
Setup: Self-host using Docker (Plausible Self-Hosting).
Pros: Simple, no cookies, easy to deploy.
Cons: Limited to basic metrics, less suited for complex user behavior analysis.

3. Umami

License: MIT License (Umami License)
Description: A fast, privacy-first analytics tool designed for ease of use and minimal data collection.
Features: Tracks page views, unique visitors, and UTM campaigns without cookies.
GDPR Compliance: No personal data collection, fully compliant when self-hosted.
Setup: Install using Docker or Node.js (Umami Docs).
Pros: Lightweight, modern interface, easy setup.
Cons: Basic analytics, fewer advanced features.

4. Pirsch

License: GNU Affero General Public License (AGPL) v3.0 (Pirsch License)
Description: A cookie-free, privacy-friendly analytics solution with server-side tracking capabilities.
Features: Real-time metrics, conversion goals, event tracking, no cookies.
GDPR Compliance: GDPR, CCPA, and PECR compliant; uses anonymized fingerprints instead of personal data.
Setup: Self-host using Go or integrate via API (Pirsch Docs).
Pros: Privacy-first, lightweight, ad-blocker resistant.
Cons: Less feature-rich than Matomo or PostHog.

5. Open Web Analytics

License: GNU General Public License (GPL) v2.0 (OWA License)
Description: A free, open-source framework for tracking website and application usage, with WordPress and MediaWiki integrations.
Features: Heatmaps, click tracking, visitor loyalty analysis, extensive API.
GDPR Compliance: Configurable to avoid personal data collection, self-hosted for data control.
Setup: Install on a PHP server (OWA Installation).
Pros: Flexible, good for WordPress users, free.
Cons: Less active development, steeper learning curve.

The table below compares the tools on the criteria that matter:

Tool	Type	License	Key Features	GDPR Compliance Measures
Microsoft Clarity	Cloud	N/A (Proprietary)	Session recordings, heatmaps	Compliant, requires consent setup
PostHog	Cloud / Self-hosted	MIT License	Product analytics, session recording	EU hosting, consent management
Matomo	Self-hosted	GPL v3.0	Comprehensive web analytics	IP anonymization, opt-out options
Plausible Analytics	Self-hosted	AGPL v3.0	Privacy-focused, basic analytics	No cookies, no personal data
Umami	Self-hosted	MIT License	Simple, privacy-focused analytics	No cookies, no personal data
Pirsch	Self-hosted	AGPL v3.0	Cookie-free, real-time analytics	Anonymized tracking, no cookies
Open Web Analytics	Self-hosted	GPL v2.0	Heatmaps, click tracking, API	Configurable for GDPR compliance

Choosing the right tool

Selecting an analytics tool depends on your needs:

Hosting preference: Cloud-based tools (Clarity, PostHog cloud) are easier to set up, while self-hosted options (Matomo, Plausible, Umami, Pirsch, OWA) keep data ownership in your hands.
Technical expertise: Cloud solutions need minimal setup; self-hosting requires server management skills.
Feature requirements: Clarity is strongest on behavioral data, PostHog on product analytics, Matomo on full-scale tracking, and Plausible/Umami/Pirsch on lightweight, privacy-first metrics.
Data control: Self-hosted tools give you the most control over GDPR compliance, since you own data storage and processing.

To stay GDPR compliant with any tool:

Implement consent mechanisms: Use cookie banners or opt-in forms to obtain user permission.
Anonymize data: Enable IP anonymization or avoid collecting personal data.
Provide transparency: Inform users about data collection in your privacy policy.
Consult legal experts: Verify compliance with GDPR and local regulations.

Conclusion

Free, GDPR-compliant analytics options range from cloud tools like Microsoft Clarity and the PostHog free tier to self-hosted open-source packages like Matomo, Plausible, Umami, Pirsch, and Open Web Analytics. Cloud tools are quicker to set up, while self-hosted ones give you the most data control. Match the tool to your technical skills and analytics needs, then set up consent and anonymization properly. Have a legal professional review the setup if the compliance risk is real.

Sources

Microsoft Clarity Official Website
PostHog Official Website
Matomo Official Website
Plausible Analytics Official Website
Umami Official Website
Pirsch Analytics Official Website
Open Web Analytics Official Website
Is Microsoft Clarity GDPR Compliant?
Microsoft Clarity GDPR: Compliance Strategies for 2025
Consent for Microsoft Clarity according to GDPR? | Cookiebox
Gaining insight into user behaviour with Microsoft Clarity
PostHog & GDPR Compliance Documentation
PostHog Security & Privacy Handbook
PostHog Privacy Compliance Overview
PostHog Terms of Service
The 9 GDPR-Compliant Analytics Tools by PostHog
10 GDPR-Compliant Analytics Tools by BlockSurvey
GDPR Compliant Analytics: Best Tools for Privacy 2025
Matomo GDPR Analytics Compliance
Plausible Analytics Google Analytics Alternative
What free GDPR compliant analytics tool? Reddit Discussion
GitHub Pirsch Analytics Repository
Pirsch Analytics Official Website