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Avaya Spaces vs Slack Business - Enterprise comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Aug 4, 2025

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Categories and Ranking

Avaya Spaces
Ranking in Enterprise Social Software
16th
Average Rating
7.6
Reviews Sentiment
7.4
Number of Reviews
3
Ranking in other categories
No ranking in other categories
Slack Business - Enterprise
Ranking in Enterprise Social Software
2nd
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
78
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of October 2025, in the Enterprise Social Software category, the mindshare of Avaya Spaces is 1.3%, up from 0.9% compared to the previous year. The mindshare of Slack Business - Enterprise is 15.8%, up from 10.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Enterprise Social Software Market Share Distribution
ProductMarket Share (%)
Slack Business - Enterprise15.8%
Avaya Spaces1.3%
Other82.9%
Enterprise Social Software
 

Featured Reviews

Karina Rivadeneira - PeerSpot reviewer
A collaborative tool with a good noise cancellation feature
We use it to conduct meetings because it is private.  The microphone's noise cancellation and static feature that record a human's voice are some of the most valuable features. The application also provides notices to everyone at the same time. You can easily use it on your phone, so it's a very…
Awais Mehmood - PeerSpot reviewer
Automation features and user-friendly interface support seamless communication
Slack is very supportive in terms of communication between my colleagues and clients. While working with the reimbursement feature, I found the automation capabilities on Slack to be incredibly useful, allowing me to automate messages for specific dates or times and even to greet someone on their birthday. I haven't specifically used the channel organization feature of Slack, as I am added to channels, but I use it with Airtable, which automates notifications to a specific Slack channel when a user fills out a form on our website. In my experience, Slack is a stable product for communication, and I appreciate its automation features and integration of AI capabilities for enhancing specific functions.

Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Pros

"The microphone's noise cancellation and static feature that record a human's voice are some of the most valuable features."
"Stability for Avaya Spaces is quite good, and I would rate it a 9."
"We use the solution for document sharing, video conferencing, instant messaging, and file sharing."
"What I find valuable in Slack is that the interface is very attractive and it's easy for any new person to adapt to."
"The solution's initial setup process is easy."
"It offers customization options for various applications, including integrations with Zoom for video calls and a wide range of other integration plugins."
"The most valuable features of Slack are basic chatting, file sharing, and screen sharing."
"With respect to being a clean and efficient communications platform, I think that it does the job quite well."
"The huddle feature is valuable to me."
"The solution's most valuable feature is the search functionality, which I can use to search for full text."
"Slack is a very collaborative tool that makes it easier for me to communicate with the onboarding and billing teams."
 

Cons

"There were some additional features coming up, as they informed us through email. But we didn't get any update on them."
"The initial setup for Avaya Spaces is very good for me, but for sharing with other users, the setup is a little bit complex compared to other solutions I have used, such as Zoom or Teams, as the installation is more complex."
"The audio calling service needs to improve its quality."
"It is difficult to navigate the tool when I log in to two devices and start a video call."
"Slack feels clustered and hence it should improve its design and UI."
"Slack's interface is not simple for me. It's not a user-friendly interface"
"I want a feature in the solution that will help me share documents only with the set of people that I prefer rather than all of them. I would also like the solution to have a feature similar to Microsoft SharePoint where you can group all your documents."
"The mobile app needs improvement. It consistently misses notifications."
"In Slack, there are areas for accessibility improvements."
"I haven't experienced any noticeable return on investment since starting with Slack."
"It would be highly advantageous if it could incorporate calendar information from sources like Outlook or Gmail, providing users not only with meeting schedules but also a comprehensive daily agenda view."
 

Pricing and Cost Advice

"The license grants you a subscription and costs about $120. I am not aware of additional costs."
"It is less expensive than one of its competitors."
"I would rate the tool's pricing a four out of ten."
"Slack is definitely worth the money."
"The solution is cheap in my country."
"The pricing can range up to about twenty bucks a user. You can spend a lot of money, especially if you're talking about thousands of users. Generally speaking, Slack is less expensive than Teams. Slack doesn't include all the bells and whistles that Teams does. So you can go from a $6 license in Microsoft 365 to a $50 license per user per month, and there's a lot more you can do in the $50 license."
"We use the free version that does not have a license."
"The solution’s pricing is cheap."
"The solution is expensive."
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Top Industries

By visitors reading reviews
No data available
Performing Arts
19%
Computer Software Company
13%
Financial Services Firm
12%
University
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business54
Midsize Enterprise13
Large Enterprise21
 

Questions from the Community

What needs improvement with Avaya Spaces?
I don't have experience with how Avaya Spaces handles integration with other software tools, but perhaps my partners have experience regarding integration with different vendors. If Avaya can integ...
What is your primary use case for Avaya Spaces?
Most of the time, I use Avaya Spaces to hold meetings with Avaya and with partners, which fulfills our collaboration needs.
What advice do you have for others considering Avaya Spaces?
I can share my opinion about Avaya Spaces and recommend it for small or medium company users, as most of them are small users. I am currently working with Azure for our cloud needs. Overall, I woul...
What do you like most about Slack?
Nowadays, we don't need to visit an HR portal. Our marketing and human resources teams directly share details about birthdays, upcoming events, and important dates in Slack. Whether it's a training...
What is your experience regarding pricing and costs for Slack?
I am not aware of pricing, setup costs, or licensing, due to my company's partnership with Slack.
What needs improvement with Slack?
The direct call feature could be enhanced, particularly when calling peers. When showing screens during calls, the screen sharing functionality is not as smooth as Google's offering. It appears to ...
 

Also Known As

Avaya Cloud Application Link
No data available
 

Overview

 

Sample Customers

Stop Soldier Suicide, British Columbia Ski Resort, Helse Vest, Spital Limmattal, Conduit Global
Strava, The New York Times, Spotify, Blue Bottle Coffee Company, Eventbrite, Box, Circa, Stripe
Find out what your peers are saying about Avaya Spaces vs. Slack Business - Enterprise and other solutions. Updated: September 2025.
871,688 professionals have used our research since 2012.