In ARES Touch you can switch between three user modes:

Full mode (all the features),
Simple mode (limited features with some annotation tools),
View-only (no application toolbar to see your drawing full-screen).
When the free trial expires or when your subscription expires you can keep using the features available in the Simple or View-only modes but will lose the premium features only available in the Full mode.
The Simple mode, and therefore the free version of ARES Touch, is enough to read DWG drawings and add some dimensions or texts. You may even save and share files. The premium features only available in the Full mode include all the drawing and editing features + some of the advanced annotation tools such as Picture Note and Voice Note. More details can be found on the Google Play store.

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