Greenmask vs Jailer

Greenmask is a free, open-source utility for logical database dumps, anonymization, synthetic data generation, and restoration. PostgreSQL 11 and later is fully supported; MySQL support is in progress and beta. Its subsetting tools can produce smaller development databases while preserving referential integrity, including cyclic and polymorphic references. Transformations may be deterministic or random, use dynamic parameters and conditional rules, and inherit across partitions and foreign-key references. Users can make custom transformers that exchange data through standard input and output, or use predefined templates. Greenmask supports local directories, S3-compatible storage, Azure Blob Storage, and SSH/SFTP. It uses PostgreSQL's pg_dump and pg_restore utilities for schema dumping and restoration, and its dumps can be restored with pg_restore. The utility is designed for CI/CD automation of anonymization and restoration. Its stateless, in-flight approach can anonymize data before it is persisted without requiring persistent storage of unmasked datasets in its normal workflow. Installation scripts support Linux and macOS; Windows is not supported yet.

Jailer is a free database tool for creating small data slices that retain referential integrity and for exploring data through table relationships. The project describes test datasets and investigating local problems using relevant production data as intended uses. It can export topologically sorted SQL, JSON, YAML, XML, and DbUnit datasets. The Data Browser follows foreign-key or user-defined relationships between tables in either direction. Its SQL Console includes code completion, syntax highlighting, database metadata visualization, and interactive charts with 11 chart types. AI features support natural-language database subsetting, SQL generation, and assistance analyzing, explaining, and refactoring queries. The AI Query Assistant supports Anthropic or OpenAI-compatible APIs, with examples including OpenAI, Azure, Groq, Ollama, and OpenRouter. Jailer uses JDBC and lists support features for databases including PostgreSQL, Oracle, MySQL, SQL Server, SQLite, Redshift, Snowflake, and ClickHouse. Liquibase integration can generate DDL scripts for database objects. The API provides programmatic data import and export through the Subsetter and Importer classes. It is available for Linux, macOS, and Windows under Apache License 2.0.