Answer: Pyure is keto, as it combines two other keto-friendly sweeteners.
Pyure is a blend of stevia and erythritol, both of which are keto-friendly.
Be sure to use the "all-purpose blend" of Pyure. Pyure sells a "bakeable blend" that contains maltodextrin, which is not keto-friendly.
The label notes 2 g of carbs, but these are entirely from erythritol. These do not count against your daily carb count, as erythritol is a sugar alcohol, so the body does not absorb it during digestion.