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Head-to-head · Threat Modeling Software

CAIRIS vs CYMETRIS

  • 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
CYMETRIS #5 in Threat Modeling Software 9.0/10 Paid ✓ 4 of 4 features Visit CYMETRIS

CAIRIS leads on 1 check, CYMETRIS on 0, and 4 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 planonly CAIRIS

CAIRIS scores higher on our rubric for threat modeling software: 9.4 against 9.0 out of 10; our editors rank them #1 and #5.

CAIRIS offers free plan; CYMETRIS doesn't.

CAIRIS is the better fit for teams needing broad, open-source threat modeling. CYMETRIS is the better fit for automotive teams running ISO/SAE 21434 TARA.

  • CAIRIS fits best

    Teams needing broad, open-source threat modeling

  • CYMETRIS fits best

    Automotive teams running ISO/SAE 21434 TARA

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Side by side

Feature CAIRIS 9.4/10 Visit ↗ CYMETRIS 9.0/10 Visit ↗
At a glance
Editor score 9.4 9.0
Ranking #1 in Threat Modeling Software #5 in Threat Modeling Software
Best for Teams needing broad, open-source threat modeling Automotive teams running ISO/SAE 21434 TARA
Pricing model Free Paid
Starting price Free plan €99/mo
Free plan ✓ (best) —
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web, Windows, macOS, Linux Web
Support Docs Email, Tickets, Docs
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features CAIRIS 4/4 · CYMETRIS 4/4
Attack-path analysis ✓ ✓
Risk prioritization ✓ ✓
Collaborative review ✓ ✓
Templates and frameworks ✓ ✓
Specs
Project limit Not checked yet 5 projects
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
  • Guided ISO/SAE 21434 TARA workflow with automatic logic checks
  • Interactive attack-path modeling linked to architecture components
  • Lifecycle versioning, vulnerability linkage, and collaborative review
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
  • CYMETRIS Lite allows up to five active projects
  • No free plan is available
  • Lite support is ticket-based rather than priority support with an SLA
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 →

CYMETRIS is a threat modeling and cyber risk analysis platform for security engineers, product security teams, and cybersecurity consultants. Its strongest fit is automotive product security, where guided Threat Analysis and Risk…

Read the review →
  1. CAIRISThreat Modeling Software 9.4Free plan
  2. CYMETRISThreat Modeling Software 9.0Paid

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

  • CYMETRIS — where it wins

    • Guided ISO/SAE 21434 TARA workflow with automatic logic checks
    • Interactive attack-path modeling linked to architecture components
    • Lifecycle versioning, vulnerability linkage, and collaborative review

    Where it doesn't

    • CYMETRIS Lite allows up to five active projects
    • No free plan is available
    • Lite support is ticket-based rather than priority support with an SLA

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