Even though some of these devices are marketed as “composters” and have instruction booklets and apps detailing all the ways in which one can use compost, the vast majority of kitchen composters are just going to grind up and dry your food scraps. Or maybe you'd just like your food grounds to be odor-free and shelf-stable before adding them to your green waste bin for municipal composting or your backyard compost. As I mentioned above, none of these machines makes truly ready-to-use, biologically stable, fully decomposed compost, but Reencle comes the closest to creating what you'd scoop out of a traditional compost bin or pile.