According to the manual for the Masterclass, the free version of Cronometer is fine...and I am not going to make this any harder than I need to with even more information!
Downloaded the Manual, TWO workbooks, added two more FB pages, and haven't yet begun synching Cronometer to the Nutrient Optimizer app.

There is a whole YouTube University for the Cronometer also...so I will start there to get the basics down first.
Logging foods, recipes, multi-add. One hour...he mentions enough about Gold features you could decide if worth it or not for you. https://youtu.be/9MKGDlWQO7s

Nutritional Optimisation Masterclass schedule:

6 February 2021 (two weeks from now)
22 May 2021
14 August 2021

DDF Challenges are planned for:
6 March 2021
17 April 2021
5 June 2021
17 July 2021
9 October 2021
20 November 2021