Amazon Echo, launched in 2014, got a good head start over Google Home, which made its debut about two years later. Amazon has the largest share of the U.S. installed base through Dec. 31, 2017, according to Consumer Intelligence Research Partners (CIRP), but Google Home saw strong gains during the fourth quarter of last year, when Google introduced a cheaper "Mini" version of its Home speaker.
The Echo Dot, Amazon's budget-priced home speaker, accounts for more than half of all Amazon voice assistant devices sold, and enthusiasts are happy to own more than one.
Corroborating data from other sources, more than 20% of Amazon Echo users and 13% of Google Home users report owning more than one unit, according to CIRP. Around 60% of consumers who use a voice assistant device have at least one other connected home accessory, such as an appliance or security system, providing clues to what other technology companies like Apple, Samsung and Facebook may need to consider as voice assistant technology evolves.