CAIRIS vs ThreatTree

CAIRIS is an open-source platform for specifying and checking systems with security and usability requirements in view. It brings together design information such as assets, countermeasures, factoids, personas, requirements, and architectural components. As a design develops, it can generate 12 views covering perspectives such as people, risks, requirements, architecture, and physical location, as well as threat models including Data Flow Diagrams. Its security analysis uses attack and architectural patterns to assess attack surface and check for known security problems and potential GDPR compliance issues. CAIRIS can produce Volere-compliant requirement specifications and GDPR DPIA documents. Its API supports design apps and connections to existing toolchains. It is free under the Apache Software License. Deployment options include Docker, Vagrant, or source installation on supported platforms; Ubuntu is the most tested. The web app supports modern browsers other than Internet Explorer, including Edge. A Chrome extension can turn highlighted webpage text into references linked to a CAIRIS server. The live demo is rebuilt nightly, and its data is visible to everyone.

ThreatTree is a browser-based tool for organizing threat models into forests of Data Flow Diagrams and Attack Trees. It scores risks by likelihood and impact, then generates a ranked risk register across the trees in a forest. Threats can be tagged with STRIDE, LINDDUN, OWASP Top 10, CAPEC, and MITRE ATT&CK; mitigations can be mapped to standards including ISO 27001:2022, NIST SP 800-53 Rev 5, CIS Controls v8, PCI DSS v4.0, NIST CSF 2.0, and SOC 2. Teams can invite members with owner, editor, or viewer roles. Reports are available as PDFs, with JSON and STIX 2.1 exports. Optional per-forest AES-256-GCM encryption is available on every plan, including Free. ThreatTree says data is stored on UK servers, connections use TLS 1.2 or higher, and encrypted database backups are taken daily and retained for 30 days. The Free plan costs nothing and has limits on forests and trees. Pro costs $29 a month per user, billed monthly; Enterprise pricing is by quote.