Title (H1)

This is a Heading App being used for H1 (note the app name is turned on too)

Subtitle (H2)

This is a Heading App being used instead of H2 in a Content app

Heading (H3)

This is a Heading App being used instead of H3 in a Content app

Subheading (H4)

This is a Heading App being used instead of H4 in a Content app