The best-selling domestic robot of all time is still the Roomba, which does not manipulate objects.

Judged as of 2019-11-14. True: as of late 2019, the Roomba (as a product line) had the highest cumulative unit sales of any domestic robot, as shown by iRobot filings and announcements (e.g. tens of millions of units sold) and market data, and Roomba robots do not grasp or manipulate objects. Mostly true: Roomba was the top-selling domestic robot line, but a minor detail is off, e.g. the record rests on brand-level rather than single-model data. Mixed: another robot vacuum or domestic robot line had comparable or contested cumulative sales, leaving the ranking unclear. Mostly false: evidence shows another domestic robot line had outsold Roomba by then, though Roomba was among the leaders. False: Roomba was clearly not the best-selling domestic robot, or Roomba models of that time did manipulate objects.

Set before the research began.

1. E1 iRobot Reports Fourth-Quarter and Full-Year 2019 Financial Results iRobot Corp. (via PRNewswire) · 5 February 2020

   “Surpassed the 30 million robots sold milestone, which includes over nine million connected robots.”

2. E2 Over 70,000 robotic vacuum cleaners sold on a single day - Robohub Robohub · 20 November 2014

   “Colin Angle said in a keynote speech that iRobot had sold 12 million Roombas since they began selling them”

3. E3 What’s behind the success of iRobot’s Roomba? The Robot Report · 30 January 2010

   “Competitive products have sold only a fraction of the number of Roomba units sold, and many product lines have been discontinued due to poor sales.”

4. E4 Over 70,000 robotic vacuum cleaners sold on a single day - Robohub Robohub · 20 November 2014

   “Now comes news that on a single day – Singles Day, a made-up holiday for the Chinese singles and youth market – Ecovacs sold $24.8 million worth of robotic products, mostly their robotic vacuum cleaners.”

The evidence shows Roomba led competitors in 2010 (E3) and had sold 12 million units by 2014 (E2), and that iRobot passed 30 million robots sold by early 2020 (E1). However, no evidence compares Roomba's cumulative sales with other domestic robot lines as of late 2019: the only later competitor figure (E4) is a one-day dollar amount. None of the evidence addresses whether Roomba models manipulate objects.