Armor vs UnderDefense: MDR comparison 2026
Armor is a Platform vendor that requires its own security platform. UnderDefense is a Pure-play MDR that works with your existing tools. Armor targets Mid-market and Enterprise organizations; UnderDefense serves Mid-market and Enterprise. Armor includes 3 attack surfaces in base pricing (Endpoint, Cloud, Network), compared to 5 for UnderDefense (Endpoint, Cloud, SaaS, Identity, Network).
Key differences at a glance
Full comparison
Which should you choose?
Choose Armor if:
- •Healthcare or financial services teams already running Microsoft Sentinel who need compliance consulting baked in
- •Multi-cloud shops on AWS, Azure, or GCP that want a single MDR provider across all three
- •Organizations that value IR and forensics included in base pricing rather than as a retainer add-on
Choose UnderDefense if:
- •Mid-market teams with existing EDR/SIEM that want MDR layered on top without ripping and replacing
- •Budget-conscious buyers who value transparent per-device pricing and full data ownership on exit
- •Organizations comfortable with a smaller, newer vendor in exchange for flexibility and no lock-in
- •You need SaaS and Identity coverage included in base pricing
- •Breach warranty matters to you (UnderDefense offers one, Armor does not)
Bottom line: Armor is the choice if you want a single-vendor stack with deep integration. UnderDefense is better if you have existing tools and want flexibility.
Frequently asked questions
What is the main difference between Armor and UnderDefense?
Armor is a Platform vendor that is platform-native (requires their own security stack). UnderDefense is a Pure-play MDR that is technology-agnostic (works with your existing tools). Armor covers 3 attack surfaces in base pricing vs. 5 for UnderDefense.
How do Armor and UnderDefense differ in response capabilities?
Armor supports 4 autonomous actions (endpoint isolation, network containment, file quarantine, custom playbooks) and approval is configurable. UnderDefense supports 6 autonomous actions (endpoint isolation, process termination, network containment, account disable, file quarantine, custom playbooks) and approval is configurable. Incident response is included with Armor and not included with UnderDefense.
How does Armor pricing compare to UnderDefense?
Armor pricing: Starting at ~$4,317/month for XDR+SOC (per SourceForge listing). UnderDefense pricing: Starts at $11/device/month (vendor-published). Watch for with Armor: Armor Anywhere agent is built on Trend Micro. Running it alongside CrowdStrike or SentinelOne may cause conflicts, forcing a swap.; Compliance consulting (HIPAA readiness, HITRUST prep) is billed as professional services on top of the MDR subscription.. Watch for with UnderDefense: $11/device is a starting price for marketing. Actual cost varies by scope, and annual contract is required.; 3-year contract required for $1M breach warranty. Not available on 1-year deals..
Should I choose Armor or UnderDefense?
Choose Armor if: healthcare or financial services teams already running Microsoft Sentinel who need compliance consulting baked in. Choose UnderDefense if: mid-market teams with existing EDR/SIEM that want MDR layered on top without ripping and replacing. Armor is not ideal for teams running macOS or mobile-heavy environments with no agent support for either. UnderDefense is not ideal for organizations that require independently validated detection metrics (MITRE, Forrester, etc.) before committing.