Johnny.Decimal

• Documentation

  The system's user manual.

• Blog

  Working ideas and implementation notes.

• Support

  Help and everything else.

Systems

• Life Admin System (paid)

  A pre-built system to manage your personal life.

• Small Business System (paid)

  A pre-built system to manage any small business.

Johnny.Decimal University

• The Workbook (free with account)

  The original resource. Online, or download the PDF.

• The Workshop (paid)

  Walk through the creation of a system from scratch with Lucy.

• Task and Project Management (paid)

  Here's how I use my system to stay on top of life.

• Learn with Lucy – Excel (paid)

  A complete beginner's course to Excel.

JDHQ

We refer to the parts of this site that are interactive as 'JDHQ'. There's lots more coming in 2026. See the video.

• Command-line tools

  Tools and tweaks for the terminal.

• Site API

  The HTTP API behind the jd CLI: build integrations against it.

• AI & LLMs

  LLMs love structure: here's how to help yours use your system.