TLDR: Red team and purple team engagements answer different questions. Running the wrong one doesn’t just waste budget, it produces misleading results at exactly the moment you need accurate signal. The choice comes down to one thing: what question are you actually trying to answer?
Most organizations know they should be testing their security controls. Fewer have a clear answer to the more important question: what do you need to learn from the test?
That gap, between “we need an assessment” and “we need to know X,” is where the wrong engagement gets selected. A red team gets scoped when a purple team would have been more useful. A purple team gets run as a substitute for a red team that felt too aggressive or too expensive. In both cases, the organization spends real money and walks away with results that don’t answer the question they actually needed answered. Sometimes they walk away more confident than they should be.
Getting this right requires understanding what each engagement is actually designed to do, and what happens when you use it in the wrong context.
What a Red Team Engagement Actually Is
A red team engagement is a goal-based, adversary-simulated operation. The red team is given an objective, typically something like “achieve access to this system” or “demonstrate the ability to exfiltrate this data,” and then operates against the live environment using real tactics, techniques, and procedures to reach it. The defenders are not informed. The SOC does not get a heads-up.
That last point is the design, not a side effect. The entire value of a red team is that it tests whether your security program can detect and stop a real adversary operating with realistic methods and real intent to avoid detection. If your defenders know an exercise is running, you are not measuring your actual detection capability. You are measuring performance under artificial conditions.
A red team engagement is not a penetration test, though the terms are frequently conflated. A penetration test is typically scoped to identify and confirm vulnerabilities within a defined boundary. A red team engagement is broader and objective-driven. The distinction matters because they answer different questions. A pentest asks: what vulnerabilities exist? A red team asks: can an adversary achieve a meaningful objective inside our environment?
What Happens When You Run a Red Team Too Early
Red team engagements produce the most value when the organization running them has a baseline detection and response capability. Without that baseline, the red team will almost certainly succeed, and the results will tell you very little about what to fix next.
If your logging is incomplete, your SIEM is not tuned, your analysts are not reviewing alerts consistently, or your detection coverage has significant gaps, a red team will move through your environment and you will not see them. The finding is accurate. The problem is that it is not actionable at a useful level of specificity. You know you have detection gaps. You do not know which specific detections are missing, how your analysts respond to the alerts that do fire, or whether your playbooks are executable under pressure.
Organizations in early to mid security program maturity often need to improve their detection capability before a red team engagement will generate findings they can act on. Running one prematurely confirms vulnerability without providing the granular, prioritized feedback that moves the program forward.
What a Purple Team Engagement Actually Is
A purple team engagement is a collaborative exercise run with defenders present and aware. The offensive operators execute specific techniques, typically mapped to a threat model or framework like MITRE ATT&CK, while defensive analysts observe whether detections fire, evaluate alert quality, and work to improve coverage in real time.
Purple team is not a test of whether you can stop an attacker. It is a calibration exercise. The goal is to improve detection and response capability by working through specific techniques in a controlled environment, identifying gaps, and closing them during or after the exercise.
This requires something a red team does not: a functioning SOC with analysts who can engage with the exercise, review logs and alerts during or immediately after each technique execution, and translate findings into detection improvements. A purple team run without that capability is a demonstration, not a calibration.
What Happens When You Run a Purple Team Instead of a Red Team
Purple team engagements are collaborative by design. That collaboration is their strength and their limitation. When you want to know whether a capable adversary can achieve an objective inside your environment, the controlled, announced nature of a purple team will not give you that answer.
If your program has matured to the point where detection coverage is solid, your analysts are trained, and your playbooks are tested, the next question is usually: does all of this actually hold up against a real adversary operating under real conditions? A purple team cannot answer that. A red team can.
Organizations with real crown jewels at risk, whether that is patient data, financial infrastructure, proprietary intellectual property, or operational systems, need to understand whether a motivated attacker can reach those assets. Running a purple team in that context produces a rehearsal result when you needed a test result. The distinction matters significantly when the asset you are protecting has real consequences if it is compromised.
The Diagnostic Questions That Drive the Right Choice
Before selecting an engagement type, the relevant questions are:
What question are you trying to answer? If the question is “can an attacker achieve this objective in our environment,” that is a red team question. If the question is “are we detecting the techniques our adversaries use,” that is a purple team question.
How mature is your detection capability? If logging is incomplete, SIEM coverage is inconsistent, or analysts are not consistently triaging alerts, a purple team engagement will produce more actionable results than a red team.
Do you have a functioning SOC? Purple team requires analysts who can engage with the exercise in near real time. Without that, the collaborative element of the engagement cannot operate.
Have you already run a red team? Prior red team findings can inform a purple team scope directly. If the red team moved laterally for three weeks without triggering a detection, that lateral movement should be the first thing the purple team stress-tests from a detection standpoint.
What is the risk profile of what you are protecting? Higher stakes generally argue for red team validation at some point in the program. The question is whether your program is mature enough for the results to be useful.
Choosing the Right Tool
Neither engagement is inherently better. They are designed to answer different questions, and the right choice depends on what you need to know and what your program is actually capable of learning from.
The organizations that get the most value from both engagements tend to run them in sequence rather than treating them as alternatives. Purple team helps build and validate detection capability. Red team stress-tests that capability against a realistic adversary operating without constraints. The combination produces a feedback loop that moves the program forward in a way that either engagement alone cannot.
The common mistake is skipping the diagnostic step. Selecting an engagement type because it sounds more rigorous, because a vendor recommended it, or because it is what you ran last year, is how organizations end up with findings they cannot act on. Start with the question you need to answer. The engagement type follows from there.
Satine Technologies is a veteran-owned offensive cybersecurity firm founded by former U.S. Cyber Command operators. We conduct red team engagements, purple team exercises, and full-lifecycle offensive security assessments for organizations that need to understand their actual risk posture.