SOC as a Service vs MDR vs In-House SOC: Which Do You Need?

SOC as a service is a subscription that gives you 24/7 security monitoring, detection, and a defined incident response process, run by an outside team on their platform, without you hiring and staffing a security operations center yourself. MDR (managed detection and response) is a narrower cousin, usually centered on the provider's own detection technology rather than the full monitor-detect-respond cycle. Choosing between SOC as a service, MDR, and building an in-house SOC comes down to three things: how much coverage you actually need, what a real 24/7 roster costs, and how much response authority you are willing to hand to someone outside your company.

This guide compares all three models plus the co-managed middle ground, works through the staffing math that most buyers skip, and gives you the questions that separate a real security operations capability from a dashboard nobody watches at 3 a.m.

What Is SOC as a Service, and How Is It Different From MDR?

A security operations center, or SOC, is the people, process, and technology that continuously monitor an environment, detect threats, and respond to them. It can be built in-house, bought as a service, or run as some mix of both; the term describes a function, not a specific vendor or product. Several related terms get used inconsistently, so define them before you evaluate anyone.

| Term | What It Actually Is | |---|---| | SOC | The people, process, and technology that continuously monitor, detect, and respond to threats, whether internal, external, or mixed | | SOC as a service (SOCaaS) | A subscription that delivers full SOC capability, 24/7 monitoring, detection, and a defined response process, from an outside team and platform | | MDR | A service focused on detecting threats across endpoints, network, identity, and cloud, then acting on or guiding the response | | MSSP | A broader managed security provider covering monitoring plus device management, firewall administration, and patching | | SIEM | A platform that collects and correlates log data so analysts have something to search and build detections on; a data layer, not a monitoring team | | XDR | Technology that natively correlates telemetry across a narrower, vendor-curated set of sources for faster detection with less custom tuning |

Where the Terms Blur in Practice

In practice the lines blur constantly. Many MDR providers run on their own XDR platform, many SOCaaS offerings are delivered by MSSPs, and vendors use these terms inconsistently in their own marketing. The distinction that actually matters when buying is not the label but three questions: what exactly gets monitored, who takes action when something fires, and how fast.

The NIST Cybersecurity Framework 2.0 organizes security work into six functions: Govern, Identify, Protect, Detect, Respond, and Recover. A SOC, however you staff it, exists to run the Detect and Respond functions continuously, and NIST's incident response guidance in SP 800-61 Revision 3 is a useful primary reference for what good detection and response actually involves beyond a vendor's own description of it. Detection and response are also only one layer of a security program; see our guide to zero trust security for how monitoring fits alongside identity and network controls.

What Does Real 24/7 Security Monitoring Actually Take?

A week has 168 hours. Continuous monitoring means every one of those hours has a qualified analyst watching, which is a staffing problem before it is a technology problem.

Work through the baseline arithmetic first. An analyst working standard 8-hour shifts, 5 days a week, covers 40 hours. Filling 168 hours with exactly one analyst on duty at every moment, with zero redundancy and nobody ever taking a day off, needs 168 divided by 40, or 4.2 full-time analysts. Real coverage needs more than one person per shift and has to survive vacation, sick leave, and turnover.

Illustrative scenario: size a baseline in-house SOC roster. Assumptions: three 8-hour shifts a day, a minimum of two analysts on duty at all times for cross-coverage and escalation, and a 35 percent staffing buffer above the bare minimum to absorb vacation, sick leave, training, and attrition, which is a conservative planning assumption rather than a universal rule. Two analysts per shift across 168 hours is 8.4 full-time equivalents at the bare minimum (4.2 multiplied by two), and applying the 35 percent buffer brings the realistic number to roughly 11 to 12 full-time analysts. That total sits before you add a team lead, a senior escalation analyst, or specialist coverage for forensics and threat intelligence.

That headcount is also why building an in-house SOC is primarily a staffing problem before it is a tooling problem. Undetected compromise compounds the issue: every hour an intruder goes unnoticed is an hour your backups may no longer be trustworthy, which our guide to cloud disaster recovery strategy covers in more depth.

In-House SOC vs SOC as a Service vs MDR vs Co-Managed: Which Model Fits?

| Dimension | In-House SOC | SOC as a Service | MDR | Co-Managed | |---|---|---|---|---| | Coverage | Only as good as the roster you build and retain | 24/7 by contract, using the provider's roster | 24/7 by contract, narrower scope than a full SOC | Provider covers off-hours and surge; your team owns business context | | Tooling | You buy, license, and tune your own SIEM or XDR stack | Provider's platform, sometimes ingesting your existing tools | Usually the provider's own detection technology | A mix: your SIEM plus provider analysts, or the reverse | | Speed to stand up | Months to a year to hire, tune, and mature | Weeks | Weeks | Weeks, but needs an existing internal team to hand off to | | Best for | Regulated or very large organizations that can staff and retain a team | Companies that want full SOC capability without building it | Companies that want strong detection and response without a broader SOC | Mid-size teams with some capability but not full 24/7 | | Biggest risk | Burnout, attrition, and alert fatigue on a thin roster | Losing business context the provider never had | Narrower scope than a full SOC; check what is and is not included | Unclear ownership of who does what during an incident |

None of these models is automatically right. A seed-stage startup with a handful of cloud services rarely needs anything beyond MDR or a light SOCaaS tier, while a regulated fintech handling its own infrastructure at scale may justify an in-house team specifically because business context and speed of action matter more than raw cost per hour of coverage.

What Does an In-House SOC Really Cost?

Building on the staffing math above, price a baseline in-house SOC. Assumptions: 12 tier-1 and tier-2 analysts using the roster logic above, one team lead, a mid-market SIEM or XDR platform, and typical loaded costs for a blended mix of experience levels. Treat every figure as a typical market range, not a quote, since location, seniority, and tooling choices swing costs significantly.

| Cost Line | Assumption | Typical Market Range (Annual, USD) | |---|---|---| | Analyst salaries, 12 FTE, loaded | Blended loaded cost of 90,000 to 130,000 per analyst | 1,080,000 to 1,560,000 | | SOC manager or team lead | 1 FTE | 130,000 to 180,000 | | SIEM or XDR platform licensing | Mid-market platform, scales with data volume | 80,000 to 300,000 or more | | Threat intelligence feeds | Optional add-on subscriptions | 20,000 to 80,000 | | Case management, paging, and on-call tooling | Ticketing, alerting, sandboxing | 15,000 to 50,000 | | Training and certifications | Ongoing, across the team | 20,000 to 40,000 | | Illustrative total | | roughly 1,350,000 to 2,200,000 or more |

Why SOC as a Service Usually Costs Less Per Hour of Coverage

SOC as a service and MDR subscriptions for a mid-market company typically run from about 3,000 to 15,000 dollars a month at the smaller end, covering a limited number of endpoints and log sources, up to 50,000 dollars a month or more for larger environments with extensive log ingestion. The provider spreads the same 11-to-12-person roster problem across many customers at once, which is the entire economic case for outsourcing this function. These figures are typical market ranges; actual pricing depends heavily on data volume, endpoint count, and how much response authority you grant the provider.

If a SOC 2 or ISO 27001 audit is what is driving this decision in the first place, see our comparison of ISO 27001 vs SOC 2 for which framework your buyers actually expect, since that answer often shapes how much logging and monitoring evidence you need to produce.

What Should You Ask Before Choosing a Provider?

Send every SOCaaS or MDR vendor the same list of questions, in writing, and compare the answers rather than the sales deck.

1. How exactly do you define and measure mean time to detect and mean time to respond, and can you show real numbers, not marketing averages?
2. Who has authority to act during an incident? Can your analysts isolate a host, disable an account, or block traffic without waiting for our approval, and for which severity levels?
3. What log sources and telemetry are included in the base subscription, and what costs extra as we add cloud accounts, SaaS applications, or endpoints?
4. Which detection framework do you map coverage to, such as MITRE ATT&CK, and can you show us our current coverage and the gaps in it?
5. Where is our data processed and stored, and does that meet our contractual or regulatory data residency requirements?
6. What is the escalation path, and who do we actually reach for a confirmed critical incident outside business hours?
7. How many customers does one analyst or pod support, and does that ratio change during a live incident?
8. What is included in onboarding, and how long until we are at full detection coverage, not just technically connected?
9. Can we export our own data and detection rules if we switch providers later, and in what format?
10. What happens if you are compromised? The CISA-led advisory on managed service provider risk is a useful checklist here: ask about MFA on provider accounts, credential segregation between customers, and how fast you would be notified.
11. How do you handle false positives and alert tuning over time, and who owns writing new detection rules for our specific environment?
12. What does the contract say about liability and notification timelines if the provider itself misses or mishandles an incident?

Monitoring and testing solve different problems, and a good provider conversation makes that clear rather than blurring it. Continuous monitoring proves you can detect and respond to an attack in progress, while a penetration test proves what a skilled attacker can still get away with despite it.

How Do You Onboard a SOC as a Service or MDR Provider?

A rushed onboarding is the most common reason a SOCaaS or MDR contract underperforms in its first quarter. Budget for the full sequence below rather than treating go-live as the finish line.

| Phase | Timeline | What Happens | |---|---|---| | Kickoff and scoping | Week 1 | Confirm in-scope systems, log sources, escalation contacts, and severity definitions | | Data onboarding | Weeks 2 to 3 | Connect log sources, cloud accounts, and endpoint agents; validate that data is actually flowing | | Tuning | Weeks 3 to 6 | Baseline normal behavior, suppress noisy false positives, write custom detection rules for your environment | | Tabletop and handoff | Weeks 6 to 8 | Run a simulated incident end to end to test the escalation path before a real one happens | | Steady state | Ongoing | Regular reporting cadence, quarterly coverage reviews, and detection updates as your environment changes |

Do not sign a contract that skips the tabletop step. A provider that has never been tested against a simulated incident in your specific environment is unproven, no matter how strong their sales presentation looked.

How Agentixly Approaches Security Monitoring

Agentixly's cybersecurity team works with companies at every point on this spectrum: standing up a first monitoring capability, layering MDR onto an existing SIEM, or acting as the co-managed partner covering nights and weekends for a team that already has daytime coverage. The starting point is always the question this guide opens with: what exactly needs to be monitored, and who acts when something fires.

1. Coverage assessment: map current log sources, detection tooling, and gaps against a framework such as MITRE ATT&CK, and define what full coverage should include for your environment.
2. Model selection: recommend in-house, SOC as a service, MDR, or co-managed based on your risk profile, budget, and existing team, without defaulting to the most expensive option.
3. Architecture and onboarding: connect log sources, tune detections, and remove noisy false positives before go-live, not after.
4. Response runbooks: written, tested escalation procedures naming who can take which action, aligned with the incident response structure in NIST SP 800-61 Revision 3.
5. Ongoing tuning: regular coverage reviews and detection updates as your infrastructure changes, rather than a static rule set from the day you signed.

Because the security team includes veterans of Israel's elite technology units, the default posture leans toward proving detection coverage with evidence, including tests against real attack techniques, rather than trusting a vendor's coverage claims at face value.

The Bottom Line

SOC as a service and MDR both solve the staffing problem that makes an in-house SOC hard to build below a certain scale, but they solve it differently: SOCaaS covers the full monitor, detect, and respond cycle, while MDR is usually narrower and centered on detection technology. Neither is automatically right for every company. Match the model to your risk, your budget, and how fast you genuinely need a human to act once something fires.

If you are evaluating SOC as a service, MDR, or a first in-house capability, Agentixly's cybersecurity team can assess your current coverage and recommend a model without steering you toward the most expensive option. Contact us to start with a coverage assessment; we respond to every inquiry within 24 hours.