Most organisations that try threat modeling and give up did not choose the wrong tool. They stopped because nobody knew how to run the sessions properly, or because the output was a report that sat unread until it went stale.
That second failure mode is more common than people admit. Threat modeling done badly produces long, technically detailed documents that are useful to security specialists and almost nobody else. Engineering teams do not act on them. Leadership cannot read them. The risk picture that should have emerged from the exercise stays locked inside a PDF. The tool worked. The outcome did not.
The point of threat modeling is not to produce a threat model. It is to understand the risks that matter to your business, so you can make decisions about where to invest and what to fix first. A prioritised, business-readable output that a CISO can walk into a board meeting with is worth more than a comprehensive technical catalogue that nobody outside the security team will ever open.
The software is not the hard part. Getting teams to do this consistently, turning outputs into risk-driven decisions, and building enough shared understanding that people actually act on the findings. That is where most programmes fall short.
There is also something worth saying about how the major platforms in this space are sold. While impressive in their own ways, both IriusRisk and ThreatModeler are VC-backed platform businesses. When the business model is built around growing licence revenue, the product roadmap answers to ARR targets. Features accumulate. The platform becomes the thing that is sold rather than the security outcomes it is supposed to deliver. That shapes what gets built, what gets demoed, and where the onboarding effort goes.
Before comparing platforms, be honest about your situation. A tool may be enough if you already have security staff who can facilitate structured sessions, win over engineers with no security background, translate outputs into risk decisions, and do all of this on timelines that fit how your development teams actually work. If you do not have that, no platform will close the gap for you.
We assessed each option on ease of adoption for teams without dedicated security resource, scalability across a product portfolio, quality of output for business decision-making, methodology depth, and what it actually costs to get real value.
Threatplane
Expert-led engagements backed by a platform built for scale
Threatplane uses threat modeling as a lens for understanding business risk, not as an end in itself. The output of an engagement is a prioritised, business-readable risk picture that engineering, product, and leadership can all act on. It contains the technical depth needed by security and engineering plus the business lens needed for smart decision making.
Because the model is built around delivering that result rather than selling licences, the incentives are aligned with yours.
Strengths
- Results-first model; incentives are aligned with your security outcomes, not platform adoption
- Risk-first output; findings are framed by business impact, not technical severity — useful to leadership, not just security teams
- Fixed scope and fixed price with no open-ended consulting retainers or scope creep
- Builds security culture; when engineering, product, and security reach shared understanding of risk together, it changes how teams build, not just what they fix
- Well suited to teams that need process, speed, and clear prioritisation rather than months of setup before anything useful emerges
Limitations
- Consultancy-led engagements have a higher starting price than a software subscription, though competitive with most security consultancies
- No self-serve option — you work with us directly, which is not right for every organisation
- Newer to market than enterprise platforms like IriusRisk
IriusRisk
Powerful for large enterprises with mature AppSec programmes
Strengths
- Extensive integration ecosystem across CI/CD, ticketing, and security tools
- Automation rules and architecture-as-code ingestion for repeatable processes at scale
- Strong compliance mapping across NIST, OWASP, ISO 27001, and others
Limitations
- No published pricing; requires a direct sales engagement. Enterprise subscription based on applications and users
- Significant ramp-up before any useful output. Teams must configure question-based templates or set up architecture-as-code ingestion before producing anything
- Assumes a mature, dedicated AppSec programme is already in place. Not suited to teams building this capability from scratch
- Models are built in IriusRisk's proprietary format, creating real switching costs if you ever want to move
- VC-backed platform business; the product roadmap serves licence growth targets, not necessarily your security outcomes
- Most teams report several months before they are producing threat models with any consistency
ThreatModeler
Enterprise-grade, but built for security architecture teams
Strengths
- Strong compliance mapping across PCI-DSS, HIPAA, GDPR, and NIST
- Visual diagramming approach suits teams that think architecturally
- Broad integration with DevOps and security tooling
Limitations
- No published pricing — enterprise subscription, direct sales only
- Visual diagram-centric workflow requires teams to learn the platform's conventions before producing anything useful
- Built for CISOs and security architecture teams in large enterprises; less suited to engineering-led organisations
- Interface shows its age; the tool has not kept pace with how modern cloud-native teams work
- Long onboarding before teams operate independently; delays before any security benefit is visible
- Proprietary threat intelligence framework creates dependency on the vendor
OWASP Threat Dragon
Free and open source, useful for getting started
Strengths
- Free to use
- Open source and community-supported
- Useful for learning the STRIDE methodology
Limitations
- No collaboration features
- Minimal reporting capability
- Requires significant manual effort to maintain over time
- Not suited to team use or production environments
Microsoft Threat Modeling Tool
Limited to STRIDE, Windows-only
Strengths
- Free to use
- Well-documented for Windows and Azure workloads
Limitations
- Windows desktop only — no web or cross-platform version
- STRIDE-only methodology
- No collaboration or team features
- Not actively developed for modern architectures
What to choose
The first question is not which tool to buy. It is whether your organisation has the expertise and process to run threat modeling consistently without external help.
If you do not have security staff with threat modeling experience, buying a platform and expecting teams to self-serve is unlikely to work. The tool gets set up, used inconsistently, and eventually ignored. Most organisations that have been through this cycle know how it ends.
There is also a cost calculation that rarely gets made explicit. IriusRisk and ThreatModeler are enterprise subscription products with opaque pricing and long sales cycles. The licence is only part of the investment. You also need the internal resource to configure the platform, integrate it into your workflows, train teams to use it, and maintain it as your architecture evolves. For most organisations, that adds up to a significant ongoing commitment before the first useful threat model is produced.
Threatplane is built for teams that want to get this right without that kind of upfront infrastructure. The engagement model means sessions are run by people who do this every day, and the output is a risk picture your organisation can actually use, not a verbose technical document that will be filed and forgotten. Engineering teams leave knowing which risks matter and why. Leadership leaves with something they can act on and defend. For scale-ups and mid-market organisations trying to build risk-driven security into their engineering culture, it is the most direct path.
IriusRisk and ThreatModeler are worth evaluating if you are in a large enterprise with a dedicated security operations function and the internal resource to operate a complex platform. They are genuinely powerful for that use case.
OWASP Threat Dragon and Microsoft's tool have their place for learning or one-off assessments. For teams that want consistent, repeatable coverage across a product portfolio, they are not a practical choice.
Jonny founded Threatplane in 2017. With a background in offensive security, he has spent 15+ years helping organisations across defence, financial services, healthcare, and manufacturing understand and manage their technology risks.
Full bio →