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Home of identification and diagnostic keys

Creating and using identification and diagnostic keys has never been easier. The Lucid Builder, Player, Fact Sheet Fusion, and the Lucid Mobile platform provide all tools needed to produce world class keys.

Want to build keys?

Learn more about building your own keys.

Looking for a key?

Want to identify an insect, plant or animal? Find out what keys are available.

Need support?

If you have any questions or need support using our tools please contact us.


Got questions? Take a look at our FAQ's.

Lucid Builder

Identification Matrix keys Multi-access keys

Easy, efficient, powerful key authoring 

Construct multimedia identification keys on any topic you choose quickly and easily. Works on Windows, OSX and Linux.

Lucid Builder main interface

The Lucid Player is used to play interactive identification or diagnostic keys or guides created using the Lucid Builder.

Lucid Builder

Spotlight Features

No limits

Add as many species and characters to your key as you want.


Lucid supports importing and exporting of key data in open formats. No data lock in here.

Reporting tools

Generate reports on the state of your key. Check if your keys features are enough for your end users to make an identification.

Easy scoring

Linking your features (questions/characters) to your species is just point and click. You can score three different ways.

Play as you go

With the built in Player you can 'play' your key anytime during its development.

Multiple operating system support

Run the Builder on Windows, OSX and Linux. The Player works without any installation and is also available on Android and Apple iOS via native apps.

Attach multimedia

Attach images and Html to your features and species. It also support attachments via Fact Sheet Fusion.

Create written descriptions

Make the most of your key data. The Lucid Builder can create natural language output from your key.

Fast deployment

The Lucid Builders built-in key deployment process makes getting your key to end users a fast and simple process.

Fact Sheet Fusion

Fact Sheet Fusion

Create fact sheets fast! 

Build fact sheets faster than you though possible! Combine with your Lucid key development or use separately Fact Sheet Fusion will greatly increase your productivity.


From our blog

Lucidcentral December 2019 Newsletter

The Lucid team wish you, your family and colleagues all the best as 2019 comes to an end – we hope you have an enjoyable Christmas, New Year and Spring Festival.We start this end-of-year newsletter with a reminder that the format of the Newsletter was last time. Each Newsletter will now contain items that have…

Review in “Land for WildLife” by Stephanie Reif

Review in “Land for WildLife” by Stephanie Reif https://www.lfwseq.org.au/rainforest-plants-of-australia/ This review of the latest app version of Rainforest Plants of Australia – from Victoria to Rockhampton (authored by Gwen Harden, Hugh Nicholson, Bill McDonald, Nan Nicholson, Terry Tame and John Williams) – notes that the app version follows on from the USB version and the…

Identifying Eucalypts made easy

Identifying Eucalypts made easy https://www.csiro.au/en/Research/Collections/ANH/Supporting-conservation/Identifying-eucalypts-made-easy This recent online article describes the history since 1997of a CSIRO project to develop EUCLID, an interactive Lucid key for identifying eucalypt species. Using the Australian National Herbarium’s collection of 65,000 eucalypt specimens, the first EUCLID key developed by the project team was a CD product, covering Eucalyptus species in…

Lucid Mobile Platform

Case Studies

case studies

Animal and Plant Identification keys
Diagnosis of crop problems and plant selection

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