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Microsoft Defender XDR vs ReliaQuest GreyMatter 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

Microsoft Defender XDR
Ranking in Extended Detection and Response (XDR)
4th
Average Rating
8.4
Reviews Sentiment
7.1
Number of Reviews
106
Ranking in other categories
Endpoint Detection and Response (EDR) (7th), Microsoft Security Suite (5th)
ReliaQuest GreyMatter
Ranking in Extended Detection and Response (XDR)
38th
Average Rating
0.0
Number of Reviews
0
Ranking in other categories
Digital Risk Protection (22nd), Managed Detection and Response (MDR) (27th)
 

Mindshare comparison

As of January 2026, in the Extended Detection and Response (XDR) category, the mindshare of Microsoft Defender XDR is 5.0%, down from 7.2% compared to the previous year. The mindshare of ReliaQuest GreyMatter is 0.9%, up from 0.3% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Extended Detection and Response (XDR) Market Share Distribution
ProductMarket Share (%)
Microsoft Defender XDR5.0%
ReliaQuest GreyMatter0.9%
Other94.1%
Extended Detection and Response (XDR)
 

Featured Reviews

KO
House security operator at Cypress Creek Renewables
Advanced threat hunting saves significant time in tracking and responding to incidents
Microsoft Defender XDR could be improved with a lower price. My main suggestion would essentially be what Copilot is providing, which is a single pane of glass, so I don't have to go to different windows. That's just a workflow consideration for me. It would be great to have all the information centralized into one particular data app. If I need to open up extra ones, I can, however, I would appreciate a future where everything I need is right there on one single pane of glass. Beyond that, there's really nothing else I see that I would want Microsoft to improve.
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Top Industries

By visitors reading reviews
Computer Software Company
14%
Financial Services Firm
9%
Manufacturing Company
8%
Comms Service Provider
7%
Financial Services Firm
13%
Manufacturing Company
8%
Retailer
8%
Healthcare Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business47
Midsize Enterprise25
Large Enterprise38
No data available
 

Questions from the Community

What do you like most about Microsoft 365 Defender?
Microsoft Defender XDR provides strong identity protection with comprehensive insights into risky user behavior and potential indicators of compromise.
What is your experience regarding pricing and costs for Microsoft 365 Defender?
My experience with pricing, setup, costs, and licensing of Microsoft Defender XDR is tied to our E5 subscription, which is very straightforward for us. We also purchase the uplift for our mobile us...
What needs improvement with Microsoft 365 Defender?
I am not aware of a mobile app that would be available for my team. With a single analyst, if she is ever away, it would be beneficial to have easier access. While she can use the web portal, the e...
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Also Known As

Microsoft 365 Defender, Microsoft Threat Protection, MS 365 Defender
No data available
 

Overview

 

Sample Customers

Accenture, Deloitte, ExxonMobil, General Electric, IBM, Johnson & Johnson and many others.
Information Not Available
Find out what your peers are saying about CrowdStrike, Trend Micro, SentinelOne and others in Extended Detection and Response (XDR). Updated: December 2025.
879,768 professionals have used our research since 2012.