Apache Calcite vs Kiwi Fabric
Apache Calcite
calcite.apache.orgKiwi Fabric
kiwifylabs.comSide by side
| Figure | Apache Calcite | Kiwi Fabric |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 0 |
| Spec score · Data Federation Software | 8.1 (#6) | 7.5 (#15) |
| Founded | 2014 | 2025 |
| Purpose | Apache Calcite is a dynamic data management framework that provides components of a database management system while omitting data storage, data processing algorithms, and metadata storage. | Kiwi Fabric provides cross-database SQL federation and distributed-write orchestration across relational, NoSQL, REST, and SOAP sources. |
| Security | Apache's Security Team coordinates vulnerability handling for Apache projects, and the project releases fixes through affected package releases. | Kiwi Fabric lists password, API-key, and domain-based authentication, role-based authorization, and row- and column-level access controls enforced at its data surface. |
| Support | The project directs users to its developers mailing list, Calcite Jira, Stack Overflow, and source code for help. | Kiwify Labs offers architecture and engineering teams help with use-case evaluation, proof-of-concept work, integration design, implementation, and production adoption. |
Plans
In their own words
Apache Calcite
Apache Calcite is a free, open-source data management framework for applications that need database-management components without built-in storage. It provides an industry-standard SQL parser, validator, and JDBC driver. Queries are represented as relational algebra, then transformed with planning rules and a cost model for optimization. Calcite can mediate between applications and several storage locations or processing engines, and can push computation to a source database. Listed adapters include Arrow, Cassandra, CSV, Druid, Elasticsearch, JDBC, MongoDB, Redis, Spark, and Splunk. Its JDBC driver supports local connections and remote connections using JSON over HTTP or Protobuf over HTTP. Calcite is available as source and through Maven, for API or self-hosted use. Build prerequisites include Git and Java JDK 8u220 or later, with Java 11 preferred. It does not store data; each source must be registered through a schema or adapter.
Kiwi Fabric
Kiwi Fabric has no write-up on Specifiction yet; its figures are above.