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The Best AI Virtual Assistants

Comparing 4 candidates for becoming your personal secretary!
Author image blue planet
Lili Marocsik
March 7, 2025
Virtual Assistant Comp Header

TL;DR

  • AI virtual assistants handle meeting transcription, scheduling, and single office tasks, with the industry moving toward fully autonomous AI Agents that complete workflows without constant prompting.
  • This comparison focuses on non-voice-commanded AI assistants (excluding Alexa/Siri-type tools) like Otter.ai and Fireflies.ai, which focus on meeting subscription.
  • Also check out our Productivity Tools comparison, which shows a bigger range of features which are similar to this.

Our review contains a few affiliate marketing links. If you purchase any of the tools, we might receive a small commission.

What does an AI virtual assistant do?

AI Virtual assistants can take over various tasks:
  • taking meeting notes and transcribe them
  • scheduling meetings for you
  • taking over single office tasks
The AI industry is working on AI Agents as the next big thing. These AI assistants can do various office tasks from beginning to end instead of requiring prompts within the workflow. For this comparison, we focused on the AI Virtual assistants that are already available and are not voice-commanded (like Alexa or Siri). Two of our three contestants offer plans for free virtual assistant services. Sometimes, chatbots are also referred to as virtual assistants because they handle customer inquiries. We have created a separate section for bots here, take a look!

When comparing Otter.ai and Fireflies.ai, I have found them to be quite similar. However, I personally prefer the interface and clarity of Fireflies.
But if you are looking for a better free deal, Otter.ai’s free plan is more generous.
I appreciate how easy it is to toggle both tools on and off for meetings.
IBM’s Watson and their lite plan was extremely hard to sign up to and generally it is setup for enterprises,so do not recommend this tool for small businesses.

Use Cases for The Best AI Tools of

Virtual Assistants

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Quick Overview of the Best AI Tools

#
Tool name
Best Pro
Biggest Con
Free Trial
1
Fireflies.AI
Playback speed control
Quality of transcription can be weak
800 Mins of Storage/Seat
2
HeyRosie
Rosie's Voice and behaviour feels real
A bit too expensive if you get many calls
First 25 minutes
3
Otter.AI
Extra simple setup
Small mistakes in transcription
300 Monthly Transcription Minutes
4
IBM Watson
Solid performance
Complicated sign up process
Free up to 300,000 tokens per month

Compare AI tools directly

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Fireflies.AI
HeyRosie
Otter.AI
IBM Watson
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Fireflies.AI
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Score 
4.67
/
5
Pros icon
Playback speed control
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Quality of transcription can be weak
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$10
HeyRosie
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Score 
4.67
/
5
Pros icon
Rosie's Voice and behaviour feels real
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Easy of use
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Very quick setup
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A bit too expensive if you get many calls
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$49
Otter.AI
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Score 
4.33
/
5
Pros icon
Extra simple setup
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Generous free plan
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Screenshots of meeting slides
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Small mistakes in transcription
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$16.99
IBM Watson
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Score 
3
/
5
Pros icon
Solid performance
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Complicated sign up process
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USD 0.06 per 1M tokens input / USD 0.25 per 1M tokens output
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Fireflies.AI
HeyRosie
Otter.AI
IBM Watson
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Fireflies.AI
Star icon
Score 
4.67
/
5
Pros icon
Playback speed control
Pros icon
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Cons icon
Quality of transcription can be weak
Cons icon
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$10
HeyRosie
Star icon
Score 
4.67
/
5
Pros icon
Rosie's Voice and behaviour feels real
Pros icon
Easy of use
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Very quick setup
Cons icon
A bit too expensive if you get many calls
Cons icon
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$49
Otter.AI
Star icon
Score 
4.33
/
5
Pros icon
Extra simple setup
Pros icon
Generous free plan
Pros icon
Screenshots of meeting slides
Cons icon
Small mistakes in transcription
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$16.99
IBM Watson
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Score 
3
/
5
Pros icon
Solid performance
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Complicated sign up process
Cons icon
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USD 0.06 per 1M tokens input / USD 0.25 per 1M tokens output
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Thank you! Your submission has been received!
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Virtual Assistants

Comparison

1
Best Tool for:
Fireflies.AI
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Score 
4.67
/
5
Tool performance:
4
/
5
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Setup/Onboarding:
5
/
5
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User Experience:
5
/
5
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Prompt coherence:
0
/
5
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AI capabilities:
0
/
5
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Voice quality:
0
/
5
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Lip sync & motion:
0
/
5
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Music quality:
0
/
5
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Image quality:
0
/
5
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Design capabilities:
0
/
5
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Fireflies.AI dashboard screenshot
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Pros:
Playback speed control
Cons:
Quality of transcription can be weak
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Monthly price starting from:
$10
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For Who?
Tested Model:
Last test:
September 24, 2025
1
Best Tool for:
Virtual Assistants
HeyRosie
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Score 
4.67
/
5
Tool performance:
4
/
5
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Setup/Onboarding:
5
/
5
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User Experience:
5
/
5
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Prompt coherence:
0
/
5
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AI capabilities:
0
/
5
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Voice quality:
0
/
5
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Lip sync & motion:
0
/
5
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Music quality:
0
/
5
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Image quality:
0
/
5
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Design capabilities:
0
/
5
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Pros:
Rosie's Voice and behaviour feels real
Easy of use
Very quick setup
Amazing comprehension capabilities
Cons:
A bit too expensive if you get many calls
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Monthly price starting from:
$49
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For Who?

This virtual assistant works a bit differently from the other tools we've reviewed so far. It's a call-answering service with voice and brains powered by AI.
First, I had to give it either my Google Business Profile link or my website. Then it would go and take all infos from there and use it for answering the calls. The system lets you add a few more details like additional questions to the caller or business times.

It also gives you the chance to call Rosie and test how well she does her job. I was really positively surprised because the AI voice is really good (there is even background noise like in a real call center) and Rosie reacted really well to my requests. She will immediately stop talking if I interrupt her, just like a real person would.
I was quite hard on her and requested very specific information from my website, which she still managed to answer about 50% correctly.

You can get notified via email or SMS is a call came in and also add specific questions you would like for Rosie to ask the caller.
HeyRosie is the future!

Tested Model:
Last test:
November 7, 2025
1
Best Tool for:
Otter.AI
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Score 
4.33
/
5
Tool performance:
4
/
5
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Setup/Onboarding:
5
/
5
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User Experience:
4
/
5
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Prompt coherence:
0
/
5
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AI capabilities:
0
/
5
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Voice quality:
0
/
5
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Lip sync & motion:
0
/
5
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Music quality:
0
/
5
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Image quality:
0
/
5
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Design capabilities:
0
/
5
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Pros:
Extra simple setup
Generous free plan
Screenshots of meeting slides
Cons:
Small mistakes in transcription
Coin icon
Monthly price starting from:
$16.99
User icon
For Who?
Tested Model:
Last test:
1
Best Tool for:
IBM Watson
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Score 
3
/
5
Tool performance:
5
/
5
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Setup/Onboarding:
3
/
5
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User Experience:
1
/
5
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Prompt coherence:
0
/
5
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AI capabilities:
0
/
5
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Voice quality:
0
/
5
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Lip sync & motion:
0
/
5
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Music quality:
0
/
5
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Image quality:
0
/
5
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Design capabilities:
0
/
5
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Pros:
Solid performance
Cons:
Complicated sign up process
Coin icon
Monthly price starting from:
USD 0.06 per 1M tokens input / USD 0.25 per 1M tokens output
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For Who?
Tested Model:
Last test:

Did you know?

Author image blue planet
Lili Marocsik
Author image blue planet
Author:
Lili Marocsik
Lili remembers the excitement of discovering the internet at 14 — a true window to the world. The AI boom now feels just as thrilling. Since 2023, she's tested many AI tools, seeing the good, the bad and the ugly (especially at the beginning). Before AI, she worked as a video marketer, crafting YouTube Ads for HelloFresh and Revolut. She believes AI should empower people, leading her to build this site for SMEs. When not exploring AI, she enjoys her 30 plants and modern art.

FAQ

Virtual Assistants

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Author Lili Marocsik

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