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Microsoft Defender for Cloud vs Nucleus Security comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Feb 23, 2026

Review summaries and opinions

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

ROI

Sentiment score
5.2
Qualys TotalCloud enhances efficiency and risk management, saving time, reducing effort and costs, with 50% operational improvement.
Sentiment score
7.1
Microsoft Defender for Cloud enhances ROI by improving security, productivity, and cost efficiency, despite perceived licensing costs.
Sentiment score
6.8
Nucleus Security improved resource efficiency and saved time, enhancing workflows and operational practices without formal financial tracking.
It has saved about 90% of our time.
Senior Consultant at a consultancy with 10,001+ employees
TotalCloud has generated overall savings of 30 to 40 percent across various departments.
Security Manager at a consultancy with 10,001+ employees
CallStream helps us integrate and automate tasks.
Senior Security Consultant at CyberNxt Solutions LLP
Defender proactively indexes and analyzes documents, identifying potential threats even when inactive, enhancing preventative security.
Endpoint management at a government with 10,001+ employees
Identifying potential vulnerabilities has helped us avoid costly data losses.
Manager at CBTS
Compared to not having Microsoft Defender for Cloud in place, we definitely saw an advantage by not having downtime due to a security threat.
Principal Microsoft Consultant at MicroAge
With security, it is always hard to quantify, and we did not really save money, but we used time more effectively and changed our way of working.
Cyber Security Architect at a retailer with 10,001+ employees
We have seen an absolutely clear return on investment in Nucleus Security, and it primarily shows up in massive time savings and vastly improved resource utilization.
manager at a computer software company with 201-500 employees
Automation handles reporting on a scheduled basis and alerts system owners about their posture each week.
Vulnerability And Compliance Manager at a insurance company with 5,001-10,000 employees
 

Customer Service

Sentiment score
7.3
Qualys TotalCloud's customer service is efficient and competent, though users desire faster responses for complex issues.
Sentiment score
6.3
Microsoft Defender for Cloud support is knowledgeable with effective documentation, but first-tier delays impact overall satisfaction.
Sentiment score
7.9
Nucleus Security's customer service is highly praised for reliability and effectiveness, with minor improvements suggested for response time.
They are helpful, respond to my queries, and can answer any question.
Developer at a consultancy with 10,001+ employees
Qualys's tech support is highly responsive, providing multiple ways to interact with them.
Service Manager, Security Operations at CDA IT SOLUTIONS
Qualys' customer service provides quality answers, but the response time is long, even though it is within the SLA.
Works at a consultancy with 10,001+ employees
Since security is critical, we prefer a quicker response time.
Manager at CBTS
The support team was very responsive to queries.
Programme Manager- Cyber Fusion- Group CISO at a financial services firm with 10,001+ employees
They understand their product, but much like us, they struggle with the finer details, especially with new features.
Endpoint management at a government with 10,001+ employees
I would describe Nucleus Security's customer support as absolutely fantastic.
manager at a computer software company with 201-500 employees
Customer support is great; I have always had communication with executive leaders, been able to have roadmap calls, and talk with support.
Vulnerability And Compliance Manager at a insurance company with 5,001-10,000 employees
 

Scalability Issues

Sentiment score
7.7
Qualys TotalCloud is praised for scalability and versatility but may require experienced personnel and isn't initially user-friendly.
Sentiment score
7.5
Microsoft Defender for Cloud is highly scalable, seamlessly integrates across platforms, and efficiently handles growth, with room for feature improvement.
Sentiment score
8.4
Nucleus Security excels in scalability, efficiently managing growing workloads and applications, ensuring robust performance and business growth.
We started our organization about nine months back. We started with about 30 users, and we now have more than 100 users.
CIO at a venture capital & private equity firm with 11-50 employees
Our organization currently uses it to manage over 1200 web applications.
Analyst, Information Security at Infosys
It is absolutely scalable, and I would rate its scalability as nine out of ten.
retired at a consultancy with 10,001+ employees
As we have reduced our on-premises infrastructure, it is about how we can migrate workloads to the cloud to make it easier, and then having everything fully encompassed and secured within that area makes it much easier for us to scale as needed and grow.
Principal Microsoft Consultant at MicroAge
We are using infrastructure as a code, so we do not have any scalability issues with Microsoft Defender for Cloud implementation because our cloud automatically does it.
Senior Cloud Platform Engineer at Deutsche Börse
It has multiple licenses and features, covering infrastructures from a hundred to five hundred virtual machines, without any issues.
Snr. Infrastructure Architect (Data Centre) at LogicEra
The platform has done a great job of handling both stability and scalability excellently.
manager at a computer software company with 201-500 employees
The scalability of Nucleus Security is fairly impressive; even when ingesting multiple assets, there is no noticeable impact.
Vulnerability And Compliance Manager at a insurance company with 5,001-10,000 employees
 

Stability Issues

Sentiment score
8.3
Qualys TotalCloud is highly stable, with excellent uptime and quick issue resolution, ensuring reliable performance and business continuity.
Sentiment score
7.6
Microsoft Defender for Cloud is stable and reliable, though minor update issues occur with older systems and internet latency.
Sentiment score
8.2
Nucleus Security offers enterprise-grade stability, with reliable performance and minimal downtime, though occasional performance variations are noted.
Overall, the support provided has been excellent.
Analyst, Information Security at Infosys
It is a stable solution, which is why we chose it.
CIO at a venture capital & private equity firm with 11-50 employees
Continuous monitoring is crucial to ensure system stability and avoid vulnerabilities or threats.
Developer at a consultancy with 10,001+ employees
Defender's stability has been flawless for us.
Engineer at a computer software company with 201-500 employees
I have not experienced any crashes or downtime.
Head Of IT at Cirrus Response
Microsoft Defender for Cloud is very stable.
Cloud architect at a tech vendor with 1,001-5,000 employees
We rarely, if ever, encounter downtime or performance degradation, even when the platform is running massive automation rules and background synchronization tasks during peak operational hours.
manager at a computer software company with 201-500 employees
 

Room For Improvement

Qualys TotalCloud needs better report clarity, dashboard customization, integration, UI, Windows OS support, pricing, and faster vulnerability detection.
Microsoft Defender for Cloud needs improved customization, automation, UI performance, policy management, integration, AI functions, and reduced licensing complexities.
Nucleus Security requires better user training, integration, intuitive onboarding, and improvements in customization, configuration, testing, and documentation processes.
Ideally, the scanner should automatically detect and scan all subdomains, even if not explicitly defined, ensuring comprehensive vulnerability assessment.
Analyst, Information Security at Infosys
Ideally, updates should be more immediate, enabling quicker implementation of solutions.
Project Lead at Persistent Systems
Our goal is to integrate all these functions into Qualys, creating a single dashboard for comprehensive security monitoring and management.
Senior Information Security Engineer at a consultancy with 10,001+ employees
Microsoft, in general, could significantly improve its communication and support.
Endpoint management at a government with 10,001+ employees
It would be beneficial to streamline recommendations to avoid unnecessary alerts and to refine the severity of alerts based on specific environments or environmental attributes.
Works at Coca-Cola HBC
The artificial intelligence features could be expanded to allow the system to autonomously manage security issues without needing intervention from admins.
Cloud Consultant at i-Community AG
Nucleus Security needs a better view into exposure management, as exposure management and attack path management are missing.
Cyber Security Architect at a retailer with 10,001+ employees
Having more intuitive step-by-step visualized wizards or guided templates for building complex triage workflows would make the onboarding process much smoother for new team members.
manager at a computer software company with 201-500 employees
It could be integrated with SentinelOne, but it was not showing any SentinelOne alerts.
Head of Security at a consultancy with 51-200 employees
 

Setup Cost

Qualys TotalCloud is considered pricey but valuable for large enterprises, offering cost-effective options especially for VMware users.
Microsoft Defender for Cloud offers flexible pricing but gets complex and costly, requiring careful evaluation, especially for advanced plans.
Qualys TotalCloud's pricing is currently acceptable, it is becoming increasingly expensive.
Senior Manager at a financial services firm with 10,001+ employees
Pricing is managed by our finance team; however, Qualys TotalCloud offers cost-effective licensing flexibility.
IT Manager at a consultancy with 10,001+ employees
Qualys TotalCloud is expensive, but it offers a premier solution with no headaches.
Vice President at Inspira Enterprise
Security has essentially no cost when compared to the cost of a breach.
Director, Cloud and Modern Workplace at Informanix Technology Group
Every time we consider expanding usage, we carefully evaluate the necessity due to cost concerns.
Programme Manager- Cyber Fusion- Group CISO at a financial services firm with 10,001+ employees
We appreciate the licensing approach based on employee count rather than a big enterprise license.
Manager, Microsoft Technology Alliance at Silverfort
The licensing model is straightforward, with one license across multiple assets for multiple connectors.
Vulnerability And Compliance Manager at a insurance company with 5,001-10,000 employees
 

Valuable Features

Qualys TotalCloud provides comprehensive cloud security, easy management, real-time insights, and efficient vulnerability assessment to enhance infrastructure protection.
Microsoft Defender for Cloud enhances security and compliance with AI-powered threat intelligence, automation, and multi-cloud integration for improved protection.
Nucleus Security streamlines risk management, enhances automation, reduces alert fatigue, and improves compliance through unified vulnerability management.
This view of risk helps reduce the work we would have to do to combine multiple sources to prioritize risk.
Works at a consultancy with 10,001+ employees
It will help cybersecurity professionals monitor the cloud and find vulnerabilities.
Developer at a consultancy with 10,001+ employees
We are enjoying the new feature, FlexScan, which is valuable for Internet-facing VMs.
Senior Consultant at a consultancy with 10,001+ employees
The most valuable feature for me is the variety of APIs available.
Programme Manager- Cyber Fusion- Group CISO at a financial services firm with 10,001+ employees
This feature significantly aids in threat detection and enhances the user experience by streamlining security management.
Cloud Consultant at i-Community AG
The most valuable feature is the recommendations provided on how to improve security.
Cloud architect at a tech vendor with 1,001-5,000 employees
By centralizing everything, Nucleus Security has completely eliminated that friction and dramatically cut down on alert fatigue across our infrastructure and support teams because the platform prioritizes risk based on real-world threat intelligence.
manager at a computer software company with 201-500 employees
The risk-based prioritization has helped my team focus on the most critical vulnerabilities by considering severity, asset context, and the remediation priorities.
Head of Security at a consultancy with 51-200 employees
The best features that Nucleus Security offers in my experience are the unified integrations with all of the different vulnerability management platforms.
Cyber Security Architect at a retailer with 10,001+ employees
 

Categories and Ranking

Qualys TotalCloud
Sponsored
Ranking in Vulnerability Management
11th
Average Rating
8.6
Reviews Sentiment
7.2
Number of Reviews
39
Ranking in other categories
Container Security (11th), Cloud Workload Protection Platforms (CWPP) (7th), Cloud Security Posture Management (CSPM) (8th), SaaS Security Posture Management (SSPM) (1st), Cloud-Native Application Protection Platforms (CNAPP) (6th)
Microsoft Defender for Cloud
Ranking in Vulnerability Management
5th
Average Rating
8.0
Reviews Sentiment
6.9
Number of Reviews
89
Ranking in other categories
Container Management (6th), Container Security (4th), Cloud Workload Protection Platforms (CWPP) (1st), Cloud Security Posture Management (CSPM) (3rd), Cloud-Native Application Protection Platforms (CNAPP) (4th), Data Security Posture Management (DSPM) (4th), Microsoft Security Suite (7th), Compliance Management (4th), Cloud Detection and Response (CDR) (3rd)
Nucleus Security
Ranking in Vulnerability Management
40th
Average Rating
7.2
Reviews Sentiment
7.1
Number of Reviews
4
Ranking in other categories
Application Security Tools (28th), Risk-Based Vulnerability Management (14th), Continuous Threat Exposure Management (CTEM) (13th)
 

Mindshare comparison

As of July 2026, in the Vulnerability Management category, the mindshare of Qualys TotalCloud is 1.1%, up from 1.0% compared to the previous year. The mindshare of Microsoft Defender for Cloud is 2.8%, down from 4.9% compared to the previous year. The mindshare of Nucleus Security is 1.0%, up from 0.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Vulnerability Management Mindshare Distribution
ProductMindshare (%)
Microsoft Defender for Cloud2.8%
Qualys TotalCloud1.1%
Nucleus Security1.0%
Other95.1%
Vulnerability Management
 

Featured Reviews

RO
IT Security Expert at Alior Bank S.A.
Unified risk scoring has improved our cloud visibility and simplifies remediation priorities
Qualys TotalCloud provides unified vulnerability and threat assessment across both IAS and SaaS. This solution provides a single prioritized view of risk, which helps reduce the work I would have to do. We are no longer based on CVSS; we are based on Qualys risk scoring, which is based on CVSS plus internal findings made by Qualys, and then assigns its own score. The TruRisk insight feature has found a small number of assets with high vulnerability scores, though I am cautious since some information is classified. Qualys TotalCloud has positively impacted our bank's performance, and we have definitely seen benefits after implementing this solution.
RW
Head Of IT at Cirrus Response
Cloud security has cut investigation time and now reveals threats faster but needs simpler oversight
When deploying AI applications, my key security concerns with Microsoft Defender for Cloud are data loss, leakage of data, and guardrails around the actual AI, and I am hoping that this is going to help me put those guardrails in place and identify data exfiltration. Microsoft Defender for Cloud has not helped me manage and secure multi-cloud environments, as we are 100 percent Microsoft and have not really got it in any other environment at all. I am not yet using the unified AI-powered security feature offered by Microsoft Defender for Cloud, but that is coming. I am not yet using the integrated XDR feature of Microsoft Defender for Cloud, but that is coming. I am not yet utilizing the GenAI threat protection features of Microsoft Defender for Cloud. That is also coming and a lot of that will come from learning it here. I have enabled the agentless scanning in my cloud environment with Microsoft Defender for Cloud. Assessing the impact on my workload protection without needing to install agents with Microsoft Defender for Cloud makes it a lot easier, but it also identifies a lot more, which puts more load on me sometimes. I would advise another organization considering Microsoft Defender for Cloud that it is the most logical route to follow if their whole ecosystem is Microsoft. It is easy to implement and it is very self-explanatory when doing it, making sense to just follow the steps as it is too simple, really. I would rate this review a 7.5 out of 10.
reviewer2872923 - PeerSpot reviewer
Vulnerability And Compliance Manager at a insurance company with 5,001-10,000 employees
Unified vulnerability view has improved risk-based decisions but reporting still needs work
One of the main issues with Nucleus Security is its lack of reporting capability. The user interface resembles an early 2000s application style, and although its speed is decent, it could be improved as more data is ingested. The overall appearance and feel need work, especially compared to modern applications from Rapid7, Qualys, and Tenable, which have more engaging user interfaces. The reporting capability is severely lacking; not being able to filter to granularity or have custom built queries is an annoyance that needs an overhaul. Additionally, there are bugs that have not been resolved, such as when you create a report and remove an asset, the asset still appears in the report despite not being present in the system anymore, leading to issues that need to be addressed quickly. Nucleus Security can become a difficult investment because I already have a vulnerability management solution, and I question where Nucleus Security fits with its licensing model. While I acknowledge automation has been described, it would be amazing to control the entire vulnerability management workflow from Nucleus Security without needing to log onto other systems. Having controls or actions that can be sent from the console down to the scanner for rescans would be beneficial. If Nucleus Security is going down this path, it should ensure that it becomes a one-stop shop for vulnerability management across multiple applications.
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Top Industries

By visitors reading reviews
Manufacturing Company
16%
Financial Services Firm
13%
Outsourcing Company
8%
Comms Service Provider
7%
Financial Services Firm
12%
Computer Software Company
10%
Manufacturing Company
9%
Government
6%
Computer Software Company
13%
Financial Services Firm
12%
Construction Company
8%
Healthcare Company
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business9
Midsize Enterprise5
Large Enterprise29
By reviewers
Company SizeCount
Small Business31
Midsize Enterprise12
Large Enterprise49
No data available
 

Questions from the Community

What needs improvement with Qualys TotalCloud?
Areas that need improvement in every solution include the remediation part. The remediation steps should be simple en...
What is your primary use case for Qualys TotalCloud?
Our use case involves the assets that we have under cloud, the assets exposed to the internet, and the internal appli...
How is Prisma Cloud vs Azure Security Center for security?
Azure Security Center is very easy to use, integrates well, and gives very good visibility on what is happening acros...
What is your experience regarding pricing and costs for Microsoft Defender for Cloud?
My experience with pricing, setup costs, and licensing was that the license cost was the only consideration. Setup an...
What needs improvement with Microsoft Defender for Cloud?
To improve Microsoft Defender for Cloud, I think pricing-wise, the license price is a little bit higher from an inges...
What is your experience regarding pricing and costs for Nucleus Security?
I have a good experience with that, so we don't have much problem dealing with pricing, setup, and licensing.
What needs improvement with Nucleus Security?
Nucleus Security needs a better view into exposure management, as exposure management and attack path management are ...
What is your primary use case for Nucleus Security?
My main use case for Nucleus Security is unifying the vulnerability management landscape, providing a single source o...
 

Also Known As

Qualys TotalCloud with FlexScan
Microsoft Azure Security Center, Azure Security Center, Microsoft ASC, Azure Defender
No data available
 

Interactive Demo

Demo not available
Demo not available
 

Overview

 

Sample Customers

Information Not Available
Microsoft Defender for Cloud is trusted by companies such as ASOS, Vatenfall, SWC Technology Partners, and more.
Information Not Available
Find out what your peers are saying about Microsoft Defender for Cloud vs. Nucleus Security and other solutions. Updated: July 2026.
904,680 professionals have used our research since 2012.