Read the back of yours Splenda label Splenda contains sucralose

Splenda IS sucralose:  www.webmd.com/diet/what-to-know-about-sucralose

Splenda is sucralose, it's the sweetener in the yellow packets.  Splenda the company also markets stevia and monk fruit as well.  They muddied the water a little bit, partly due to the fact that making/offering other low carb sweeteners will give them a bigger share of the low carb sweeteners market.

Splenda and Stevia are NOT the same.  Stevia is an herb.