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Head-to-head · Threat Modeling Software

CAIRIS vs ThreatModeler Nexus

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score CAIRIS #1 in Threat Modeling Software 9.4/10 Free plan Free plan✓ 4 of 4 features Visit CAIRIS
ThreatModeler Nexus #3 in Threat Modeling Software 9.2/10 Free plan Free plan✓ 3 of 4 features Visit ThreatModeler

CAIRIS leads on 0 checks, ThreatModeler Nexus on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreCAIRIS · 9.4/10
  • Free planboth
  • Most featuresCAIRIS · 4 of 4

CAIRIS scores higher on our rubric for threat modeling software: 9.4 against 9.2 out of 10; our editors rank them #1 and #3.

CAIRIS is the better fit for teams needing broad, open-source threat modeling. ThreatModeler Nexus is the better fit for cloud-native teams needing AI-assisted modeling.

  • CAIRIS fits best

    Teams needing broad, open-source threat modeling

  • ThreatModeler Nexus fits best

    Cloud-native teams needing AI-assisted modeling

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature CAIRIS 9.4/10 Visit ↗ ThreatModeler Nexus 9.2/10 Visit ↗
At a glance
Editor score 9.4 9.2
Ranking #1 in Threat Modeling Software #3 in Threat Modeling Software
Best for Teams needing broad, open-source threat modeling Cloud-native teams needing AI-assisted modeling
Pricing model Free Free plan + paid
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web, Windows, macOS, Linux Web
Support Docs Email, Tickets
Built for Small business, Mid-market, Enterprise Enterprise, Mid-market
Features CAIRIS 4/4 · ThreatModeler Nexus 3/4
Attack-path analysis ✓ ✓
Risk prioritization ✓ ✓
Collaborative review ✓ (best) Not checked yet
Templates and frameworks ✓ ✓
Specs
Project limit Not checked yet Not checked yet
Modeling methods Multiple Multiple
Deployment Both Both
Our review
Pros
  • Combines data-flow, threat, requirements, and architectural modeling
  • Includes risk scoring, attack trees, patterns, and reusable templates
  • Supports self-hosting, APIs, imports, exports, and generated documentation
  • Maps systems from diagrams, code, documents, cloud, and infrastructure-as-code
  • Prioritizes risk and records attack paths with threats and countermeasures
  • Connects modeling with CI/CD, compliance reporting, SSO, and audit trails
Cons
  • Its broad scope may require more modeling coordination than focused tools
  • Self-hosted deployment places infrastructure responsibility on the organization
  • The feature set extends beyond teams seeking only basic threat diagrams
  • No open-source edition
  • The listed platform is web-based rather than a native desktop client
  • Enterprise governance features may add overhead to lightweight reviews
Our verdict

CAIRIS is an open-source platform for designing, specifying, and validating secure and usable systems. It is intended for security designers, requirements engineers, researchers, educators, and organizations working on software or…

Read the review →

ThreatModeler Nexus is an enterprise threat-modeling platform for security, architecture, development, and compliance teams. It builds system maps from architecture diagrams, code, documents, cloud environments, and infrastructure-as-code,…

Read the review →
  1. CAIRISThreat Modeling Software 9.4Free plan
  2. ThreatModeler NexusThreat Modeling Software 9.2Free plan

Strengths and trade-offs

  • CAIRIS — where it wins

    • Combines data-flow, threat, requirements, and architectural modeling
    • Includes risk scoring, attack trees, patterns, and reusable templates
    • Supports self-hosting, APIs, imports, exports, and generated documentation

    Where it doesn't

    • Its broad scope may require more modeling coordination than focused tools
    • Self-hosted deployment places infrastructure responsibility on the organization
    • The feature set extends beyond teams seeking only basic threat diagrams

  • ThreatModeler Nexus — where it wins

    • Maps systems from diagrams, code, documents, cloud, and infrastructure-as-code
    • Prioritizes risk and records attack paths with threats and countermeasures
    • Connects modeling with CI/CD, compliance reporting, SSO, and audit trails

    Where it doesn't

    • No open-source edition
    • The listed platform is web-based rather than a native desktop client
    • Enterprise governance features may add overhead to lightweight reviews
  • CAIRIS9.4/10 · Free plan

    A broad open-source choice for teams connecting threats, requirements, architecture, and risk.

    Visit CAIRISFull verdict →
  • ThreatModeler Nexus9.2/10 · Free plan

    AI-assisted threat modeling with attack paths, risk prioritization, compliance, and CI/CD checks.

    Visit ThreatModelerFull verdict →

More comparisons

All threat modeling software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update