Horizon3 proves the path, then hands it off.
Simbian proves it, then runs the SOC.
Horizon3's NodeZero compromises the internal network, proves the path, and reports whether your tools caught it. Simbian's AI Pentest Agent proves the path too, then triages the alert, hunts the activity, and engineers the missing detection on one shared model.
Talk to an AI SecOps ExpertTrusted by leading enterprises and MSSPs
Horizon3 tells you if your defenses saw it. Simbian runs them.
Both prove what's exploitable and check whether your controls saw it. What splits them is what happens to the finding next.
What both do
- ●Autonomous exploitation, not scanningBoth chain real weaknesses like a human attacker, not a scanner matching signatures.
- ●Proof by safe, real exploitationReproducible proof of impact in production, not a model's guess.
- ●Detection validation with MITRE ATT&CK mappingBoth report whether your controls detected, blocked, or missed the attack.
- ●Augments pentesters, never replaces themHuman experts keep the hard cases; both produce compliance-ready output.
Where Simbian pulls ahead
- ▸It runs the SOC, not just a reportHorizon3 flags the missed control and hands your team the evidence. Simbian takes that finding and closes it: triage, hunt, and a new detection on the same model.
- ▸One shared model, closed and kept closedA proven exploit becomes defensive context on one Context Lake and one MITRE ATT&CK scoreboard. The fix is retested until the Window of Exposure closes.
- ▸It tests your apps and your software supply chainWeb and API testing, including BFLA and multi-role parallel, plus exploitability of the packages your code depends on, not vendor questionnaires.
- ▸Human sign-off when auditors need itThe agent pairs with LRQA specialists for attested reporting; Horizon3's core pentest is self-service.
Same attack. Different next move.
Both attack like a human. What splits them is what happens after the exploit lands.
Horizon3Simbian
What it is
Horizon3Horizon3.ai's NodeZero, an autonomous pentesting and Adversarial Exposure Validation platform, "security you can prove." It proves attack paths and validates whether your controls saw them.
SimbianAn autonomous offensive tester that is also one node of a closed offense-to-defense loop.
Autonomy model
Horizon3Self-service SaaS; an internal Docker or OVA node, or a cloud-run external test, chains weaknesses with no predefined script. The AI is attack-side, deliberately not open-ended agent loops.
SimbianParallel attacker instances per run, plus one per configured role; adaptive discovery that reasons rather than following a script.
Primary attack surface
Horizon3Internal network, Active Directory and identity to domain compromise, external perimeter, cloud on AWS and Azure, Kubernetes, and phishing impact. Web and API testing is a newer Early Access addition.
SimbianApplication-layer by design, where your custom logic and shipped code live: web and API apps including the authorization-boundary class (BOLA, BFLA), multi-role parallel testing, and software supply-chain package exploitability; Cloud Link reaches behind-firewall apps.
Exploitation
Horizon3Real, production-safe exploitation across the network and identity fabric; chains credential attacks and misconfigurations to domain-level impact.
SimbianExecutes techniques in the real environment with adaptive, context-aware exploitation; a Safe Mode judge vetoes high-risk actions before they run.
Proof and evidence
Horizon3Diagrammed attack paths with replayable proof and MITRE ATT&CK mapping; groups systemic issues so one fix resolves many.
SimbianA Thought Trace per finding, the reasoning trail plus deterministic reproduction steps, with versioned, audit-trailed findings.
Detection handling
Horizon3Reports whether your tools detected, blocked, or missed each attack and forwards the evidence, plus Tripwire decoys, into your SIEM and SOAR for your team to act on.
SimbianRuns the SOC on the same model: it triages the alert, hunts the activity across telemetry, and engineers the missing detection, acting on the signal rather than only grading it.
Context and memory
Horizon3Insights dashboards trend results across past runs; no persistent per-tenant memory that changes the next test is described.
SimbianContext Lake™, persistent org-specific memory shared across every agent; feedback on a finding carries into the next run on the same app.
The loop
Horizon3Proves the path and validates controls, then hands the evidence off to your existing tools and people.
SimbianA closed loop on one substrate: Pentest, Threat Hunt, AI SOC, and Detection Engineering on one Context Lake and one MITRE ATT&CK scoreboard, with a fix-verified retest.
Where Simbian separates
Both prove what's exploitable. Simbian goes further on coverage and on the response after.
R1
Exploitation and offense coverage
Horizon3Simbian
Autonomously finds and exploits real vulnerabilities with no predefined script
Chains weaknesses to non-obvious attack paths, exploitation not pattern-matching
Production-safe exploitation with reproducible proof of impact
R2
Application and supply-chain coverage
Horizon3Simbian
Web and API application testing, generally available
Authorization-boundary class at scale, BOLA and BFLA, multi-role parallel
Software supply-chain, package and dependency exploitability
R3
Autonomy
Horizon3Simbian
Fully autonomous, no human input required per run
Graded safety governor before offensive actions run
Continuous or scheduled testing
R4
Evidence and reporting
Horizon3Simbian
Deterministic proof of exploitability, no hallucinated findings
Full reasoning trace per finding
Fix guidance and a fix-verification retest of the same path
Board- and auditor-ready reporting
R5
Detection and closed-loop offense to defense
Horizon3Simbian
Validates whether your controls detected, blocked, or missed the attack
Maps the attack to the MITRE ATT&CK framework
Triages the resulting alert, running the SOC
Hunts the activity across your telemetry
Engineers or tunes the missing detection autonomously
One shared per-tenant model for offense and defense
R6
Deployment
Horizon3Simbian
Self-service SaaS with fast setup
Compliance-aligned deployment (PCI DSS, SOC 2, ISO 27001)
Managed human specialist review and sign-off in the offering
API and CI/CD programmatic pentests
R7
Learning and self-improvement
Horizon3Simbian
Trends results across past runs
Persistent per-org memory shared across agents
Feedback on a finding carries into the next run on the same app
Offensive findings become defensive learning across agents
Graded maturity model for attack resilience (ARMM)
Full Limited None
Frequently Asked Questions
Simbian's AI Pentest Agent. Like any autonomous pentester it finds and exploits real vulnerabilities at machine speed, but it doesn't stop at proving a path. It closes the loop: each proven exploit flows into AI Threat Hunt and the AI SOC on one Context Lake, so you learn whether your SOC would catch it, feedback carries into the next run on the same app, and it retests the fix until the window closes.
Both are autonomous pentesters that exploit real vulnerabilities and validate whether your controls detected the attack. Horizon3 is strongest on internal network and Active Directory attack paths, then hands the evidence to your team. Simbian is appsec-native, adds software supply-chain testing, and runs the SOC on one shared model, triaging the alert, hunting the activity, and engineering the missing detection.
Yes. Horizon3 reports whether your tools detected, blocked, or missed each attack and maps it to MITRE ATT&CK, then forwards the evidence to your SIEM and SOAR. What it doesn't do is act on that signal. Simbian runs the SOC on the same model, so a proven exploit is triaged, hunted, and turned into a new detection, not just a report.
As a Horizon3 alternative, Simbian's AI Pentest Agent is an autonomous pentester like NodeZero that also adds the defensive half: it hands each proven exploit into AI Threat Hunt and the AI SOC on one Context Lake, verifies whether detection fired, and retests the fix. Unlike most Horizon3 competitors, it ships web, API, and software supply-chain testing, and pairs with LRQA human specialists for attested reporting.
Horizon3 and Pentera are the two most-shortlisted autonomous pentest platforms for internal network and infrastructure testing. Simbian is the appsec-native option that also closes the loop: each proven exploit flows into AI Threat Hunt and the AI SOC on one shared model, so the finding is triaged, hunted, and turned into a detection, then retested until the fix is verified.
No. AI changes what pentesters spend their time on; it doesn't replace them. Routine recon and baseline testing move to the agent, and human experts focus on business-logic abuse, chained exploits, and frontier vulnerability classes. Simbian names three evolved roles and pairs its agent with human specialists through the LRQA partnership.