Name: Gnomon
Availability: InStock
Author: Will Percey

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		Developer:	Will Percey (1)
		Price:	* Free New
		Score:	580 Bronze
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Description

Gnomon is an architecture workbench. Draw C4, UML, ArchiMate, AWS and Azure diagrams in PlantUML, and Gnomon reads what you drew: it builds a STRIDE threat register from your C4 diagram, analyses agentic architectures, and renders everything offline on your own machine.

THREAT MODELS FROM YOUR C4
Trust boundaries and data flows are exactly what STRIDE needs, and you already drew them. Gnomon turns the architecture into a threat register, with severities and CWE references, instead of a blank page and a workshop.

A NOTATION FOR AGENT SYSTEMS
Design agent systems in a notation built for them: thirteen element kinds, eleven ways a run can end, and analyses that show which exits you never modelled and which requirements nothing actually enforces.

NOTHING LEAVES THE MACHINE
Rendering and analysis run locally with a bundled engine and runtime. No account, no upload, no telemetry by default.

A SERIOUS EDITOR UNDERNEATH
• 109 templates: C4, UML, ArchiMate, AWS, Azure, integration patterns, threat models and agentic architecture, plus ADRs, RFCs and post-mortems in Markdown
• Live preview that keeps up with typing
• D3 for what PlantUML can't draw: sankey flows, treemaps, force graphs, calendar heatmaps
• Export to PNG, SVG and PDF
• Boards and a planning canvas alongside your diagrams

AI FEATURES ARE OPTIONAL
Gnomon's AI features work with Claude Code, Codex or Gemini CLI, which are separate tools from Anthropic, OpenAI and Google. Gnomon does not bundle, install or require them, and it does not sign you up to anything.
Everything Gnomon is sold for works without them: the editor, 109 diagram templates, offline rendering, the agentic analysis panel, the threat register and every export format. If none of these tools is installed, the AI surfaces are not offered, and nothing else changes.

FREE TRIAL AND SUBSCRIPTION
Gnomon is free to try for 30 days, with no card and no account. Continued use requires a subscription purchased from gnomonapp.com, outside the Microsoft Store.

REQUIREMENTS
Windows 10 version 1809 or later (x64). Requires the Microsoft Edge WebView2 Runtime, which is included with Windows 11 and installed automatically by Windows Update on Windows 10.

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Developer

Will Percey
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Platforms: Windows Apps (1)
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What's new

Version: PC
Last Updated: 2026-10-19 13:07:02 UTC

Additional Information

Release Date: 2026-10-16 13:06:54 UTC
Category: Windows Apps › Developer tools
OS: PC
Size: 114 Mb
Supported Languages: English
Content Rating: EVERYONE
Windows Store Rating: ^¡ 0
Website: https://gnomonapp.com

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580

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Gnomon
Developer: Will Percey

580 Bronze

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On AppAgg, you can track the Windows app “Gnomon” by Will Percey, listed under Developer tools. AppAgg Score: 580 (Bronze). AppAgg Points for the app — confirmed: 0; indirect: 0. Public lists containing the app: 0. Users who have saved it in private lists: 0. AppAgg users have not rated the app yet. Confirmed Points record visits to a store by signed-in AppAgg users; indirect Points are based on store data. AppAgg counts public lists containing an app or game and users who have saved it in private lists. The app was first released on 2026-10-16 13:06:54. The app was last updated on 2026-10-19 13:07:02. The app is currently available for free. The app is available in these languages: English. Explore the price history, add the app to a list, or follow its developer. Follow future deals and updates for the app via its RSS feed. AppAgg does not host or distribute the app. All trademarks, logos, and screenshots related to the app belong to their respective owners.