Instead of pytm
pytm alternatives
pytm is a free, open-source Python framework for developer-centric threat modeling on Linux, macOS, and Windows. You define servers, data stores, actors, processes, data flows, and trust boundaries in Python, then generate data-flow diagrams, sequence diagrams, threats, reports, and browser-presentable slides. It supports risk prioritization, custom threat files, JSON model loading, and Graphviz or PlantUML output. Windows use is documented through WSL, and diagram generation requires Python 3.11+, Graphviz, Java OpenJDK, and plantuml.jar.
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CAIRIS
Free plan APILinuxMac+3Secure, usable system design with many visual perspectives — CAIRIS combines security, usability, requirements, personas, architecture, 12 views, and GDPR documentation, beyond pytm's Python threat-model workflow.
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OWASP Threat Dragon
Free plan LinuxMacSelf-hosted+2Visual STRIDE modeling with desktop and web deployment — Threat Dragon offers desktop installers, browser storage integrations, and multiple threat categories with rule-based suggestions instead of pytm's Python definitions.
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ThreatForge
Free plan LinuxMacWeb+1Offline visual modeling with optional AI assistance — ThreatForge adds a drag-and-drop canvas, offline STRIDE rules, YAML versioning, six templates, and BYOK Claude or GPT analysis.
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IriusRisk
Free plan APISelf-hostedWebAI-generated models tied to compliance and integrations — IriusRisk generates diagrams from stories, documents, transcripts, or code and maps controls to standards such as PCI DSS, NIST, and GDPR.
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Threagile
Free plan APILinuxSelf-hosted+1Git-based YAML risk tracking and automated reports — Threagile uses YAML architecture models, custom YAML risk rules, mitigation-state tracking, Excel or JSON exports, and GitHub Actions.
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ThreatModeler Nexus
Free plan APISelf-hostedWebGoverned enterprise modeling across complex environments — ThreatModeler Nexus provides a Secure Design Graph, AI agents, three methodologies, 180-plus framework mappings, and pull-request checks through MCP.
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ThreatOpus
Free plan APIWebCI pull-request decisions and imported architecture — ThreatOpus combines STRIDE modeling with Merge Guard pull-request PASS, WARN, or FAIL decisions, imports from OpenAPI or Terraform, and CI integrations.
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Dethernety
Free plan Open source APISelf-hostedWeb - 9
AWS Threat Composer
Free plan APIExtensionLinux+4 - 10
ADTool
Free plan - 11
ThreatTree
Free plan APIWeb - 12
TSpec
Free plan - 13
DevArmor
Paid APIExtensionSelf-hosted+1 - 14
CYMETRIS
Paid APISelf-hostedWeb - 15
Microsoft Threat Modeling Tool
Free plan Windows - 16
ThreatZ
Free trial APISelf-hostedWeb - 17
AutoSec TARA Suite
Paid Self-hostedWeb - 18
itemis SECURE
Paid WebWindows - 19
SD Elements
Paid APISelf-hostedWeb5.4 Visit site - 20
KAVACH
Paid Windows - 21
EnCo SOX ATA
Paid WebWindows - 22
ThreatModeler CloudModeler
Paid Web
Readers may look elsewhere if they want browser-first access, visual drag-and-drop modeling, broader integrations, built-in threat frameworks, AI assistance, or design and compliance analysis beyond pytm's code-defined workflow. Compare how each option stores models, deploys, connects to development tools, generates suggestions, and handles standards or risk tracking. Pricing also differs: several alternatives are free, while others use freemium or paid plans. The better choice depends on whether you prefer Python and self-hosting, a desktop canvas, collaborative web access, or governed automation across engineering workflows.