UnderDefense alternatives (2026)

4 managed security service providers tools listed alongside UnderDefense for side-by-side comparison on capabilities, pricing, and deployment. No editorial ranking.

Why look for UnderDefense alternatives?

UnderDefense is a strong option for managed security service providers, but it's not the right fit for every team.

Below we list 4 alternatives, broken down by deployment model. All data is aggregated from official documentation and community feedback.

Head-to-Head Comparisons

UnderDefense vs Arctic WolfUnderDefense vs ExpelUnderDefense vs eSentireUnderDefense vs Red Canary (a Zscaler company)

Cloud-Managed Alternatives

Arctic Wolf

Managed security operations platform with concierge-delivered vulnerability management services

Cloud

Per-asset managed service (annual contract)

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Expel

Vendor-neutral MDR founded by former Mandiant leaders, known for transparent operations and an API-only bring-your-own-tech model.

Cloud

Subscription per integrated surface

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eSentire

Canadian MDR pioneer delivering 24/7 SOC services on the Atlas security operations platform, with strong financial-services and legal-vertical specialisation.

Cloud

Subscription tiers (Atlas Essentials / Advanced / Complete)

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Red Canary (a Zscaler company)

MDR provider known for deep Microsoft Defender expertise and high-fidelity detection engineering, acquired by Zscaler in 2025.

Cloud

Subscription per managed surface

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