Autonomous pentesting, plus the expert pentesters the Big 4 trust with their clients

Subscribe to the autonomous pentesting platform, bring in certified pentesters on demand, or run a custom program that blends both across your whole estate. Every fix revalidated: automatically on the platform, expert-signed on engagements.

Big 4 and global consulting firms bring us in to pentest their government and enterprise clients.

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Trusted by security teams at

MatchBook AI Curio FRONT STEPS GravyStack Stonebranch

Autonomous Pentesting platform

Autonomous Pentesting

Continuous coverage and testing at the speed you ship.

$500 / month · starting

25 test runs / month included

GenPT engine: AI-native DAST across web apps & APIs
25 test runs / month: use across up to 25 apps, or re-test fewer more often
Continuous attack-surface monitoring: unlimited, uncapped
Unlimited users, every plan
Verified Closure: Automated revalidation, reappearance flagged
Run tests and analyze results from your favorite LLMs using MCP servers
One-click SOC 2 / ISO / PCI / HIPAA / NIST reporting
Jira, ServiceNow, Slack & GitHub · CI/CD · SSO via Okta

14-day free trial · Need deep-dive depth?

Expert Engagements

Human depth, signed off, audit-ready.

$3,000 / app · starting

Starting price = a small app (≤3 roles, <5 APIs, <20 pages); scales with scope

PTaaS with in-house testers: OSCP / CPENT / CEH, never a crowd
AI & LLM attack surface: OWASP LLM Top 10: prompt injection, jailbreaks, model extraction, chained attacks
Agentic AI testing: sub-agent IDOR, tool abuse, escalation chains
RAG pipeline security: poisoning, context injection, embedding extraction
Deep-dive manual pentest across web, API, network, cloud, mobile, LLM apps & MCP servers
Findings logged in real time, the moment they're identified
Verified Closure: Expert sign-off & certificate; free retest within 60 days
Signed report meeting evidence needs for PCI DSS 4.1, CMS ARS & MARS-E, SOC 2 Type II

Request an Estimate

Every engagement ends in a signed report · see a sample →

Custom Programs

Automated breadth and human depth across your whole estate.

Custom

Committed-spend & volume discounts

Everything in Autonomous Pentesting, plus Expert Engagements bundled
AI-native + certified manual coverage across large, multi-app estates
The more you commit, the less per app: volume & multi-year pricing
High-volume testing programs, scoped to your estate
Region-specific data residency, local instance on request
Dedicated advisor & account team, enterprise SLA
Standard MSA, security questionnaires & redlines

Procurement-ready in days, not quarters

Startups & small teams Under 50 employees? Get Autonomous Pentesting from just $100/month, 5 test runs included.

Talk to an Expert →

Compare the three

	Autonomous Pentesting	Expert Engagements	Custom Programs
Price	From $500 / month · 25 tests	From $3,000 / app	Custom
Delivery	You operate · self-serve	We run · in-house testers	Both · managed
Autonomous platform
AI-native testing (GenPT / DAST)	✓	–	✓
Continuous attack-surface monitoring	✓ unlimited	–	✓
Run from your LLM via MCP	✓	–	✓
Unlimited users	✓	✓	✓
Certified human testing
Manual pentest (OSCP / CPENT / CEH)	–	✓	✓
AI / LLM / agent / RAG deep testing	✓ Automated	Manual depth	Both
Signed report & audit letter	✓	✓	✓
Verified Closure	✓ Auto revalidation	✓ Expert-signed cert	Both
Compliance & scale
Compliance evidence	✓ SOC 2 / ISO / PCI / HIPAA / NIST	✓ PCI 4.1 · CMS ARS · MARS-E	✓ Full
Data residency / local instance	✓	✓	✓
Committed-spend discounts	✓	✓	✓
Dedicated team & SLA	✓ Self-serve support	✓ Named AM	✓

Autonomous Pentesting platform

The one you subscribe to and operate.

You operate it · self-serve · software subscription

AI-driven testing for breadth and continuity across your attack surface, running from day one: closing the long stretch between deep tests when nothing else is watching. For business-logic depth and chained exploits, add Expert Engagements.

Continuous attack-surface mapping, vulnerability assessment, and AI-native DAST
MCP server testing: automated on the platform, not an add-on (GA)
Automated revalidation on every fix, with reappearance flagged
One-click SOC 2 / ISO / PCI / HIPAA / NIST reporting
Every finding triaged by our AI layer; high-severity findings validated by certified analysts
Routes findings to Jira, ServiceNow, Slack, and GitHub. Fires on every deploy via CI/CD. SSO through Okta

Expert Engagements

PTaaS with in-house testers.

We run it · on-demand · one-time or continuous

Penetration Testing as a Service, delivered by in-house OSCP / CPENT / CEH pentesters: not a crowd. On-demand, however you need it: one-time engagements for compliance windows and pre-launch reviews, or continuous programs with pentesters always in your environment.

Deep-dive manual pentesting and red-team-style depth on any asset: web, API, network, cloud, mobile, LLM apps, AI agents, or MCP servers
OWASP LLM Top 10: adversarial depth automation can't reach. Prompt injection, jailbreaks, model extraction, chained attacks tested by hand
Agentic AI testing: sub-agent IDOR, tool abuse, escalation chains
RAG pipeline security: poisoning, context injection, embedding extraction
Signed, audit-ready third-party pentest reports
Production-safe: intrusive tests run only with written authorization

Prefer to run this from your AI assistant?

Siemba works inside Claude Desktop, Claude.ai, Cursor, and any MCP client.

Book a demo

Real programs. Proven outcomes

FRONT STEPS

Real EstateSaaSNation's largest HOA/COA platform

Replaced periodic pentesting with continuous threat visibility, and built a security and compliance foundation aligned to their audits and their SaaS model.

$700K

saved over two years: a 70% cut in projected security spend, reinvested into product and customer growth.

Fewer gaps

Clear mitigation strategies and continuous expert guidance closed security gaps before they became costly incidents.

Confidence

Smoother audits and more effective risk management, with a security posture the team could stand behind.

Read the FRONT STEPS story →

"Siemba helped us benchmark and maintain visibility across layered, interconnected systems, while expediting triage and remediation."
Jim Maggio · VP Engineering, FRONT STEPS

PiiE

Fintech · AI payments

Mapped every finding to a PCI DSS control, turning continuous compliance evidence into a competitive advantage.

Stonebranch

SaaS · IT orchestration

Replaced annual-only testing with continuous validation, gaining the depth and context to prioritise remediation across a global estate.

Fortune 500 Enterprise

Enterprise IT · Internal Platforms

Closed privilege escalation and cross-session leakage in a shared AI agent platform before thousands of users relied on it.

What teams say about working with us

★★★★★

"Pentesting on steroids."

Continuous, automated, and actually actionable.

Security ProfessionalLinkedIn Review

★★★★★

Streamlined process and expert-led assessments facilitate smarter vulnerability detection.

A verified review of Siemba on Gartner Peer Insights.

Verified ReviewerProject Manager · Computer Software Industry

Gartner

★★★★★

Taught us how to think about security.

Siemba didn't just find issues, they taught us how to think about security.

Alvin AllenHead of Cybersecurity · FrontSteps

Customer

The average app ships dozens of releases between annual pentests.
Attackers don't wait for your next one

Not ready to buy yet?

Try us out: see what an attacker sees.

Point Siemba at one domain and get a free external attack-surface scan. No sales call. Or see a sample report first.

Have a question about pricing? Contact us or drop us a message in the chat.

For MSSPs, Global systems integrators (GSIs) & channel partners

Bring Siemba to your clients.

Resell the platform, white-label our pentesting, or embed testing into what you already deliver: we run the testing, you keep the relationship.

Become a partner

Straight answers on pricing

One authenticated or unauthenticated test against a single web app or API. Autonomous Pentesting starts at $500/month, 25 runs included: use them across that many different apps, or fewer apps re-tested more often. Continuous attack-surface monitoring runs alongside them and is unlimited; the run count applies only to deep test runs.

Buy a test bundle on top of your plan: no hard stop, no surprise lockout. Bundles are priced by volume, and volume discounts are offered the more you add.

Autonomous Pentesting is a software subscription you operate: continuous, automated coverage billed monthly. Expert Engagements are certified human pentests we run for you, billed per engagement. Need both across a large estate? That's a Custom Program, priced with committed-spend discounts.

In-house OSCP, CPENT and CEH certified testers: never outsourced freelancers or a bug-bounty crowd. You get a named tester for the length of the engagement.

Autonomous Pentesting bills monthly with no lock-in; switch to annual billing and you save 20%, invoiced once for the year. The 20% saving only applies when you're on annual billing. Expert Engagements are billed per project. Custom Programs are invoiced against agreed milestones.

Yes. We never brute-force or stress production systems. Any intrusive or potentially disruptive test runs only with your explicit written permission, under rules of engagement agreed before testing begins.

On one-time Expert Engagements, retesting to confirm your fixes is free within 60 days of the report. On continuous programs and the platform, revalidation runs whenever you're ready: automatically on the platform, expert-signed on engagements.

Yes. We work directly with your legal and security teams on standard procurement paperwork, questionnaires, and redlines: aiming to be procurement-ready in days, not quarters. Full detail on how we handle your data is on our Trust page.

Test like an attacker. Before one does

Start with Autonomous Pentesting today at a price you can see up front, or talk to us about a program built for your estate.

Talk to sales