Crux, an open-source bitemporal Datalog database
Discover XTDB, an open source bitemporal database that combines document storage with graph querying capabilities and flexible time-based data models
Crux, an open-source bitemporal Datalog database launched on May 15, 2019 with 18 votes, #883 of 3,072 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 7 years on.
In plain words
Crux is an open-source bitemporal Datalog database designed for developers who need to query data across multiple points in time. It supports bitemporal modeling, allowing users to track both valid time and transaction time for their data. The database uses Datalog for querying and is built for applications requiring temporal data capabilities and complex relational queries.
written from the facts on this page · September 2026
From the sources
Crux is now XTDB September 2021 Update: Crux has recently been renamed XTDB. The official home for XTDB is now https://xtdb.com . We have just released Crux - an open-source bitemporal database. Crux is a document store that indexes documents for graph query. The indexes are bitemporal, meaning that you can query against valid time and transaction time , the usefulness of which is covered in our previous post “the value of bitemporality” . Crux is an unbundled database - to use Martin Kleppman’s phrase - shipping as a connected set of pluggable parts. This means that users can swap out parts and contribute their own, and that Crux itself follows the Unix philosophy of each part doing one…from juxt.pro
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