Alex BitterTue, July 7, 2026 at 9:11 AM UTCZoox is picking up momentum judging by monthly active users, according to data from Apptopia.Jay Janner/The Austin American-Statesman via Getty ImagesAlphabet-owned Waymo has long had a size and time advantage in the robotaxi world.A new report shows Amazon-owned rival Zoox gaining users, though.Zoox has grown its number of active users so far this year as it started operating in new cities.One robotaxi provider is picking up speed against the competition.Amazon-owned Zoox grew its share of monthly active users to 25% from 15% during the first half of 2026, according to data from Apptopia.Waymo, which has long been the largest self-driving taxi service in the US, had about 69% of monthly active users in June. That was down from 79% in January, according to Apptopia. The Alphabet-owned company drew data from app stores and its panel of about 15 million users across a variety of apps.Zoox has spent the first six months of 2026 expanding its operations. The service launched rides in Austin and Miami and expanded its service areas in San Francisco and Las Vegas