Do these boxes actually eliminate litter odor?

Across the reviewers we read, odor control depends more on how often the waste drawer is emptied than on any brand's marketing claims. PetSnowy's TiO2 system and the Litter-Robot 4's OdorTrap/carbon filter setup get the strongest organic praise on r/cats and r/litterrobot, while open-top designs like the Neakasa M1 Plus rely more heavily on the sealed waste bag. Almost every brand has at least some owners reporting odor buildup after several months without deep cleaning.