Unfortunately sweet, not plain.
The yogurt is called plain, but it’s sweet, so can’t be used in savoury dishes. Sugar is high up on the ingredients list. I wanted to make a vegan mint riata dip, or to try straining it to make cream cheese. I don’t understand why the product needs to be sweet. Dairy plain yogurt is never sweet. Apart from that, it is smooth and creamy, with a light flavour, hence I have given only X4 stars.