Gravity Forms doesn’t offer a colorpicker as one of their standard fields. JetSloth released a Gravity Forms Add-On to include a color-picker in your form. It hooks into several Standard Fields like ‘Single Line Text’, ‘Radio Buttons’ and ‘Checkboxes’.
Gravity Forms Color Picker
JetSloth built their Gravity Forms Color Picker add-on off the back of their own popular Image Choices add-on for Gravity Forms. The GF Color Picker add-on works straight out of the box. Simply tick on the ‘use colors’ option when you add any checkbox or radio based field. Gravity Forms Color Picker supports radio fields, checkbox fields and single text line fields.
Using color picker in Single Line Text
This JetSloth plugin adds a checkbox to the 'General' tab of the Single Line Text to choose Use Color Picker.
Using color picker in Radio Buttons
The Radio Buttons field allows users to select one option from a list. Only one option from the available choices can be selected. It is available under the Standard Fields section within the form editor. JetSloth hooks in on the default Radio Buttons to add a color option.