Open Diffix review
A focused open-source toolkit for synthetic data and dynamic PostgreSQL anonymization.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Open Diffix is an open-source project for anonymizing structured data, aimed at analysts, developers, and data owners who need to share or analyze datasets while reducing disclosure risk. Its tools cover synthetic data generation, dynamic anonymization for PostgreSQL queries, and a desktop data anonymization application. Deployment is on-premises, with API access and support for Windows, macOS, Linux, and self-hosted environments.
Its strongest area is the breadth of its synthetic-data workflow. The SynDiffix Python package supports descriptive analytics, including histograms and heatmaps, as well as machine-learning dataset generation. It can also generate synthetic data across multiple tables, create and read SynDiffix blobs, and handle protected entities in event and time-series data. This makes Open Diffix a fit for teams that need more than simple field masking and want anonymized datasets for analysis or model development.
The PostgreSQL component adds a separate path for dynamic anonymization by providing aggregate anonymized answers to SQL queries through the pg_diffix extension. However, development on pg_diffix is currently paused, which matters for teams choosing a PostgreSQL-centered workflow. Open Diffix should suit open-source teams seeking on-premises tooling for structured-data anonymization, synthetic datasets, and analytics. Teams that need an actively developed PostgreSQL component or a broader data-protection scope should assess alternatives alongside it.
Open Diffix pros and cons
- Where it wins
- Generates synthetic data for analytics and machine learning
- Supports multi-table generation and protected-entity handling
- Provides dynamic PostgreSQL query anonymization
- Where it doesn't
- pg_diffix development is currently paused
- The focus is structured data rather than broader data types
- Referential-integrity support is not part of the stated capability set
Open Diffix fact sheet, pricing and score →
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