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ThreatModeler Nexus vs TSpec

Both stand on threat modeling software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

ThreatModeler Nexus

Free plan APISelf-hostedWeb

ThreatModeler Nexus connects threat modeling with architecture, compliance, and development workflows, with options for web, API, and self-hosted environments. The listed license has an annual contract, and deployment may also involve AWS infrastructure costs.

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TSpec

Free plan

Pick TSpec if you develop TypeScript applications on Node.js and want a free framework with assertions, mocks, and watch mode. Look elsewhere if you need a published package now, since current use requires building from source and publication is still forthcoming.

Visit TSpec

The facts

ThreatModeler NexusTSpec
Free planYesYes
Open sourceNot publishedNot published
Runs onAPI, Self-hosted, WebNot published
Lowest paid planThreatModeler license: $4,000 a yearNot published
Plans published2None
MakerNot publishedNot published
Websitethreatmodeler.aigithub.com
On threat modeling software#9 of 23#13 of 23

ThreatModeler Nexus: what it does well

  • Maps findings to more than 180 frameworks
  • Supports STRIDE, PASTA, and CSA MAESTRO
  • MCP Server checks pull requests and commits against threat models
  • Customers can connect their own AI model
  • Lists ISO 27001:2022 and SOC 2 Type II certifications

What to know first

  • ThreatModeler license costs $4,000 a year
  • Additional AWS infrastructure costs may apply
  • Support applies only to the current and preceding major versions

TSpec: what it does well

  • Native TypeScript support with zero-configuration basic use.
  • Includes synchronous and async Promise assertions.
  • Mock package supports functions, spies, and method replacement.
  • Watch mode can select tests affected by changed files.
  • Documents process exit codes for CI/CD workflows.

What to know first

  • Requires Node.js 20 or later.
  • Current use requires building from source.
  • Package publication is described as coming soon.

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