Thanks for your awesome feedback! Defining exact hex color value, entering exact thickness/opacity/text size value is now available in Xodo beta! See http://feedback.xodo.com/knowledgebase/articles/1119511-change-style-of-an-annotation-color-thickness-o.
To enter exact color HEX value, see: http://feedback.xodo.com/knowledgebase/articles/1849546-annotation-color-picker.
To define and select style presets, see: http://feedback.xodo.com/knowledgebase/articles/1851553-setting-an-annotation-style-preset
You can become our beta tester as described here: http://feedback.xodo.com/knowledgebase/articles/829551-becoming-a-beta-tester.
Just FYI, “more”/“plus” button for adding customized tools to toolbar is under review! Hopefully we can implement it in the future!
209 votesPaolo commented
xodo is the best app for my smartphone. An improvement could be countless favorite files and not just a limited number, ocr (such as' a fairy text)