Lucid Builder v4

Welcome to the Lucid4 Builder

Lucid Builder Version 4 main interface example
Lucid Builder Version 4 main interface example matrix key (weeds)
Lucid Phoenix main interface with example pathway key (insects)

Welcome to the Lucid4 Builder, one member of the Lucid family of products. The Lucid Builder allows the creation of advanced matrix (random access) or dichotomous identification keys.

Written in Java, Lucid4 is a cross-platform implementation, and will run on any Java-enabled operating system (such as Windows, Macintosh, Unix, Linux, Sun Solaris etc).

Read more about what the Lucid Builder can do.

For additional information on Lucid and related programs, please visit the Lucidcentral website at


A Java Runtime Environment (JRE) must be installed before Lucid will install or run. We recommend installing the latest open JRE from: