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Expel vs UnderDefense comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Jul 24, 2026

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

Expel
Ranking in SOC as a Service
5th
Ranking in Managed Detection and Response (MDR)
14th
Average Rating
8.6
Reviews Sentiment
7.8
Number of Reviews
2
Ranking in other categories
No ranking in other categories
UnderDefense
Ranking in SOC as a Service
4th
Ranking in Managed Detection and Response (MDR)
10th
Average Rating
10.0
Reviews Sentiment
7.2
Number of Reviews
5
Ranking in other categories
Endpoint Detection and Response (EDR) (22nd), Security Orchestration Automation and Response (SOAR) (10th), Extended Detection and Response (XDR) (15th), Compliance Management (10th), AI-SOC (8th), AI-Powered Security Automation (4th)
 

Mindshare comparison

As of November 2026, in the SOC as a Service category, the mindshare of Expel is 7.9%, down from 9.1% compared to the previous year. The mindshare of UnderDefense is 1.6%, up from 0.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.
SOC as a Service Mindshare Distribution
ProductMindshare (%)
UnderDefense1.6%
Expel7.9%
Other90.5%
SOC as a Service
 

Featured Reviews

reviewer2917971 - PeerSpot reviewer
Founder And Principal Technical Consultant at a consultancy with 51-200 employees
Expel has transformed MDR workflows and now streamlines phishing response and SOC 2 audits
Some of the best features Expel offers is the ease of use. Ease of use is top of mind. It also provides an opportunity for me to replace my SOC. Not necessarily replace my SOC because I utilize contractors on an as-needed basis, but it allows me to stay lean. I do get 24/7 monitoring, although they recently shortened up on the 24/7 monitoring offering. It also allows me to augment the existing SOC that I have for larger companies or larger enterprises that rely on me for that. It then extends the use of the tools I already have, as I mentioned with SentinelOne. Octa is another that comes to mind, and then for larger organizations that use CrowdStrike.
Ivan Voitovych - PeerSpot reviewer
Founder at Urlicer
AI-driven SOC triage has transformed threat monitoring and keeps our security work focused
The best features UnderDefense offers include mostly triage in-context signals read together across my stack, where one finding replaces many separate checks. A good thing too is its false positive suppression, as I do not get false notifications. Normal activity such as traffic spikes during customer events is recognized and documented, and only the unusual cases reach me. It has full-time support 24/7 with proactive reports, and monitoring runs around the clock. Reports and alerts come to me without even noticing or asking, so it is very useful. My team sees what happened without having to chase it. I find the proactive reporting and 24/7 support to have definitely made a real difference. Proactive reports mean I hear about what happened without having to ask, so I know the state of things at the start of the day, and 24/7 support matters most for traffic spikes and other events outside busy working hours, as I get an answer when I need one without keeping someone on call just in case, saving me a lot of time. Together, they let my team stay on infrastructure work and step in only when a decision is needed. Regarding UnderDefense's AI capabilities, I think the governance and security is the best there is, as the decisions that matter stay with my team and each finding is documented, allowing me to review afterwards how a conclusion was reached. That control and traceability is what I need from AI in a security role. The accuracy and reliability of UnderDefense's AI output is accurate and steady, as findings have matched what I saw when I checked them, and the pattern assessments are consistent, especially during large traffic events or spikes, which is when I depend on them most. When a case needs judgment, the reasoning is there so I can confirm it myself.

Quotes from Members

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

Pros

"Expel's customer support is great."
"Their threat hunting protocol and process with AI and machine learning are strong, allowing for active and rapid responses."
"Every morning we look at a short list of cases that matter instead of a long list of raw alerts, and each case comes with the full picture, so we can decide in a few minutes whether it needs action."
"The linking, the filtering, and the readable reasoning each help on their own, but together, they allow a small security team to handle the volume our platform produces without losing sight of the cases that matter."
"UnderDefense groups it into one alert with the caller, the endpoint, and the usual pattern, which allows us to contact the customer the same day with facts in hand."
"Routine signals are handled and documented, and only cases that need a human decision reach my team, allowing engineers to spend their time on infrastructure hardening instead of log digging."
"UnderDefense Gen AI SOC flags behavior that breaks from an account's own baseline, lays out which signals triggered the alert and why it reads as different from normal activity, and helps our team decide within the same day whether we are seeing a legitimate big campaign push or a compromised login."
 

Cons

"The one area where Expel may not measure up is if a customer requires a managed SIEM as part of their overall solution. There's a gap there, and solutions might require third-party assistance for management."
"I think the 24/7 SOC could be improved."
"UnderDefense could improve in onboarding, which takes some dedicated time because the baseline for our high volume upload events needs to be set up first."
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Top Industries

By visitors reading reviews
Financial Services Firm
15%
Construction Company
10%
Computer Software Company
8%
Manufacturing Company
7%
Manufacturing Company
39%
Construction Company
13%
Security Firm
11%
Outsourcing Company
9%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
No data available
 

Questions from the Community

What is your experience regarding pricing and costs for Expel?
Expel's pricing has adapted as the market evolved and has become competitive over the past twelve months.
What needs improvement with Expel?
The one area where Expel may not measure up is if a customer requires a managed SIEM as part of their overall solution. There's a gap there, and solutions might require third-party assistance for m...
What is your primary use case for Expel?
I have experience reselling Expel. Customers often come to me wanting to evaluate multiple providers to make a choice based on their specific use cases, requirements, technology investments, and so...
What is your primary use case for UnderDefense?
Our main use case for UnderDefense Agentic AI SOC is to watch how accounts actually use our platform. Our product is a large database of creator data that customers search and export, so the bigges...
 

Also Known As

Workbench, Expel SOC-as-a-Service
No data available
 

Interactive Demo

Demo not available
 

Overview

 

Sample Customers

Amanda Fennell CSO
Kyte, Betsson Grourp, Mammut, Accedian.
Find out what your peers are saying about Arctic Wolf Networks, LevelBlue, Palo Alto Networks and others in SOC as a Service. Updated: October 2026.
920,574 professionals have used our research since 2012.