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We are proud to provide industry-acclaimed support for our customers, starting with free, onsite evaluations for qualified prospects with application requirements well-suited for Kx technology.

We pride ourselves on being highly responsive to customer needs, typically responding to technical inquiries within minutes, and offering solutions within the day; these are responses from knowledgeable staff who are familiar with the code at a very deep level, not scripted responses from an outsourced support center.

Beyond this, we offer a full ecosystem of resources – of both the material and the human variety – that enhances the experiences of our customers.

Sales inquiries

Write to or visit our Contact page.

Licensed customers

kdb+ Topicbox
If you work at a company that has licensed kdb+, you can join the k4 Topicbox group.
Designated Contacts

Licensed customers designate to Kx staff members whom they have authorised to deal with kdb+ licenses, downloads and bug reports. Designated Contacts can reach us at the following addresses:

Urgent license
Suspected bug, unexpected

Technical support
If you work at a company that has licensed kdb+, please refer to your internal support team, your Designated Contact, or the kdb+ Listbox.

This site is the primary resource for kdb+ developers.

The complete reference for q and kdb+, with a reference card, and formal definitions of q primitives, grouped by semantic topic.
Q for Mortals 3
An online edition of the classic textbook, now in its third edition.
Technical White papers
An occasional series of white papers on developing systems with kdb+.
Knowledge Base
A collection of shorter articles on developing systems with kdb+.
Interfaces between kdb+ and other languages, services and editors.

Web and Real-World

kdb+ personal developers
An open Google discussion group for users of the Personal Developer edition of kdb+.
Stack Overflow
Stackoverflow has a substantial collection of kdb+ questions and answers.
Kx on GitHub
Developers from around the world share some of their best kdb+ code, libraries, and frameworks on GitHub, and Kx indexes them. Please send your kdb+ repository URLs to
Use to find Kx events round the world.