Everything you need for high-assurance arguments.
A purpose-built editor for assurance case development. From real-time collaboration to dialectic reasoning, Lemmatica gives your team the tools to build, validate, and defend structured arguments.
Real-time Collaboration
Live cursors, presence awareness, and multiplayer editing. See your team’s changes as they happen, with automatic conflict resolution and node-level locking.
GSN V3 Compliance
Full support for standard and extended GSN notations including goals, strategies, solutions, and all annotation types. Every structural rule is continuously verified.
Live Validation
Catch structural errors instantly. Undeveloped goals, invalid connections, and missing elements are flagged in real time so issues never reach review.
Dialectic Support
Capture counter-arguments and defeaters directly in your assurance case. Track argument resilience with visual defeat indicators and challenge-response chains.
Evidence Management
Attach evidence to solution nodes with status tracking, activity logging, and traceability. Keep a complete audit trail from claim to proof.
Away Goals
Break complex arguments into manageable sub-cases linked by away goals. Navigate hierarchical structures with breadcrumb trails and cycle detection.
Command Palette
VS Code-style command palette with Cmd/Ctrl+K for fast node creation, navigation, and actions. Keyboard-first workflow for power users.
Auto-Layout
Automatic hierarchical layout powered by Dagre keeps your argument trees readable. Override positions manually when you need precise control.
Dark & Light Themes
Full dark and light mode support with a perceptually uniform colour system. Reduce eye strain during long review sessions without losing visual clarity.
Ready to modernise your assurance cases?
Join high-assurance teams building with confidence. Free during beta.