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Other terms uses for these Artificial Intelligence Voice Assistant devices, and software are:
Smart Assistant, Smart Speaker, Digital Assistant, personal digital assistant, voice activated device, and Far Field Voice Technology.

    Amazon Dot        Google Mini
† Other Echo speaker models
* Other Google Assistant Speakers

They all answer questions:
What time is it?
What is the weather tomorrow?
And do things like:
Set an alarm for 6 AM
Add milk to my shopping list
Play some classical music.

Hardware Software Price Best at Audio
Amazon Echo Plus and Dot Alexa $149
Widest smart-home device support. Lights, switches, thermostat
Video calling with Echo Spor or Echo Show
Amazon Echo Show Alexa $60-$170 Video Calls, Amazon Prime videos, see what music you’re playing, pause, or skip tracks
Sonos One Alexa
Sonos App
$200 Similar to Echo, Better sound
Google Home
Home Mini
Android Phone
Google Assistant, Google Now $129
Home entertainment control. Interface to smart TV (or a TV with chromecast attached) or audio.
Best at answering general questions.
Apple HomePod speaker
Apple iPhone, iPad
Siri (Sassy) $350 Best sound
MICROSOFT Invoke Smart Speaker
Windows Phone,
Cortana Good at answering questions
JBL Link 20 $200 Wi-Fi
Harman Kardon Invoke Cortina $100 best speaker for Skype
UE Blast and Megablast $230
In addition to its built-in features, the Alexa platform includes a growing list (more than 15,000 at last count) of "Skills," akin to apps on a smartphone, that unlock capabilities such as reading recipes, ordering pizza, or calling an Uber.


Sample Answers to Questions or Commands

Far-field voice input processing (FFVIP). - The ability of a microphone to separate voices from noise when the speaker is 12 to 15 feet away.

The Best Smart Speakers of 2018 | PCMag.com
Amazon Echo 2 vs Sonos One vs Google Home | Best Smart Speaker Comparison | RIZKNOWS
75 Point Comparison of Amazon Echo to Google Home - HomeAlarmReport.com
Sample Answers
Smart Assistant Review: Living With Alexa, Google and Siri | Time
Amazon Echo vs. Google Home: Which Voice Controlled Speaker Is Best for You?: Wirecutter Reviews | A New York Times Company
Make the Most Out of Amazon Echo and Google Home | WIRED
Google Home Mini review - The Verge
Siri vs. Google Assistant vs. Alexa vs. Cortana: Which AI is best? - Business Insider
Dave's notes
Digital assistants: Siri vs Google vs Alexa | TechRadar

last updated 26 Mar 2020