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Glean Platform vs Microsoft FAST comparison

 

Comparison Buyer's Guide

Executive Summary

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

Glean Platform
Ranking in Indexing and Search
2nd
Average Rating
8.6
Number of Reviews
12
Ranking in other categories
Search as a Service (4th), AI Agent Builders (4th), AI Software Development (10th), AI Customer Support (7th)
Microsoft FAST
Ranking in Indexing and Search
8th
Average Rating
9.0
Number of Reviews
2
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of August 2026, in the Indexing and Search category, the mindshare of Glean Platform is 4.6%, up from 1.5% compared to the previous year. The mindshare of Microsoft FAST is 5.1%, down from 6.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Indexing and Search Mindshare Distribution
ProductMindshare (%)
Glean Platform4.6%
Microsoft FAST5.1%
Other90.3%
Indexing and Search
 

Featured Reviews

Ananya Bl - PeerSpot reviewer
Data Analyst at Capgemini
Daily orchestration of complex ai workflows has boosted my research and automation capabilities
Orchestration primarily decides which agent handles which part of a task and manages errors, retries, and complete state while maintaining the workflow effectively. On the orchestration side, branching, looping, and human approvals support non-linear workflows in production environments with real-time access. Through refined and improved prompts, this helps in closing the loop with actual users. One unique feature that stood out is that every step in the workflow can pause or recover from failures. Instead of finishing the entire agent in one go, this approach is interesting because if there is a minor change in a previously completed step regarding the state, I can re-edit and restart from the beginning. This is truly impressive.
reviewer1466883 - PeerSpot reviewer
Technical Specialist at a tech services company with 5,001-10,000 employees
Robust solution with good value
Microsoft FAST is quite robust. Our clients are quite happy with it. For other users who already have a solution in place, we recommend Microsoft FAST because it is more compatible and you can organize the solution with Microsoft components. If you are with any other third party, there could be a chance that the required output is not what you would expect. But with Microsoft, it will work better. It is compatible with the older generation systems, so you can offer it. On a scale of one to ten, I would give Microsoft FAST an eight because I'm quite comfortable with it.

Quotes from Members

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

Pros

"The best features Glean Platform offers include the ability to create my own agents, for example, I created a self-service agent for my stakeholders, so rather than email me, I sent them a link to an agent where the agent asks them questions and drills down to exactly what they need, and then I get a qualified response from them."
"The major impact that I have noticed is how business users are now being impacted and they are using the platform because they understand it easily."
"I have used many solutions, but Glean Platform is the best, and I would truly appreciate it if everyone considers this platform."
"Glean Platform has positively impacted our organization, especially in terms of productivity for both us and our customers."
"Glean Platform has increased productivity by at least one hundred hours per week for my organization."
"Life became so easy when we started using Glean Platform."
"Productivity has really skyrocketed."
"When I searched for internal information spread across different systems, Glean Platform did centralize and retrieve that data for me effectively, giving me eighty percent accuracy."
"Microsoft FAST is a really amazing search application."
"Microsoft FAST is quite robust. Our clients are quite happy with it."
"Microsoft FAST is quite robust, our clients are quite happy with it, and for other users who already have a solution in place, we recommend Microsoft FAST because it is more compatible and you can organize the solution with Microsoft components."
 

Cons

"My experience with pricing, setup cost, and licensing for Glean Platform reveals limited options, and I wish there was more customization available."
"There are multiple ways in which Glean Platform can be improved."
"Glean Platform can implement more models. The NLP creation could be a little faster, and while debugging is amazing, the routing also needs to provide higher quality outputs sometimes rather than extensive searching."
"I tried pulling in an architecture diagram of a workflow, and it pulled in some other image instead."
"My experience with pricing, setup cost, and licensing is that the licenses were expensive, and it was hard to convince the company to adopt based on that."
"Currently, Glean Platform does not integrate with Teams, Microsoft-owned platforms."
"Sometimes Glean Platform gets slowed down."
"In workflow agents, I would prefer that we do not use AI in every step and instead we have a toggle button or something which can configure whether AI should be used in this specific search field or not, or in this specific node or not, because currently it's using AI in all nodes which sometimes messes up the output."
"If there is any change in a system or a configuration or an update, we might face some issues."
"We do get support from Microsoft, but the response is quite slow."
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Top Industries

By visitors reading reviews
Financial Services Firm
17%
Manufacturing Company
12%
Outsourcing Company
10%
Retailer
5%
No data available
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business3
Midsize Enterprise1
Large Enterprise9
No data available
 

Questions from the Community

What is your experience regarding pricing and costs for Glean Platform?
My experience with pricing, setup cost, and licensing for Glean Platform reveals limited options, and I wish there was more customization available.
What needs improvement with Glean Platform?
In workflow agents, I would prefer that we do not use AI in every step and instead we have a toggle button or something which can configure whether AI should be used in this specific search field o...
What is your primary use case for Glean Platform?
I use Glean Platform as an enterprise search tool and I am a power user of agents, so I mostly use this on a day-to-day basis for random searches that I need to do about a company, a website, or if...
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Also Known As

Glean Work AI Platform
MS FAST
 

Overview

 

Sample Customers

Information Not Available
Moffitt Cancer Center, Hitachi Solutions, Manupatra Information Solutions, Unique World, _KODA AUTO a.s., MindTree Ltd, Mississippi Department of Transportation
Find out what your peers are saying about Glean Platform vs. Microsoft FAST and other solutions. Updated: August 2026.
909,725 professionals have used our research since 2012.