Apache Polaris

Leading open-source Apache Iceberg REST catalog; positioned as the vendor-neutral alternative to proprietary catalogs like Databricks Unity Catalog

Apache Polaris is an open-source, REST-based catalog implementation for Apache Iceberg tables, designed to provide a vendor-neutral, interoperable foundation for data lakehouse architectures. Originally developed internally at Snowflake as a proprietary catalog service, Snowflake donated the project to the Apache Software Foundation in August 2024, signaling a broader industry push toward open standards in data governance and catalog management. The project reached v1.0 incubating status in July 2025, marking a significant maturity milestone for enterprise adoption. Polaris implements the Apache Iceberg REST Catalog specification, allowing any Iceberg-compatible query engine — including Apache Spark, Apache Flink, Trino, DuckDB, and others — to connect and manage table metadata through a standardized API. This engine-agnostic approach directly challenges proprietary catalog solutions by enabling organizations to avoid vendor lock-in while maintaining fine-grained access control, multi-tenant namespace management, and catalog federation across cloud environments. In the broader data infrastructure and AdTech ecosystem, Apache Polaris is significant as a foundational layer for organizations building open data lakehouses that power analytics, audience segmentation, and data clean room use cases. Its primary competitive tension is with Databricks Unity Catalog, which offers similar governance capabilities but within a more closed, platform-specific context. As an Apache project, Polaris benefits from community-driven development and vendor-neutral governance, making it attractive to enterprises seeking open, auditable infrastructure for sensitive data workloads.