How much stevia powder equals a spoon of sugar?

The brand says about 1 g, or a quarter teaspoon, gives the sweetness you want. Start small and add more, since stevia is many times sweeter than sugar.

Is this pure stevia or a blend with fillers?

It is described as pure Stevia rebaudiana powder. That means no maltodextrin or erythritol bulking agents, so it is far more concentrated than cup-for-cup blends.

It sweetens, but it does not replace sugar's bulk, browning or texture. Use it in drinks, sauces and dressings, or follow recipes written for stevia.

How do I make stevia syrup from it?

Stir the powder into warm water until dissolved, then cool. A little powder goes a long way, so taste as you go.

Why does it taste different from white stevia?

Unrefined leaf powder keeps the plant's compounds, which read as herbal or slightly bitter to some people. Refined stevia extracts taste cleaner but are more processed.