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Cascii.app is a lightweight ASCII diagram builder designed for portability and immediacy, enabling text-based diagrams suitable for code, consoles, and environments that render plain text. It supports ASCII and Unicode modes, export options including copying to clipboard and Base64 I/O, and a hosted version with short links to edit drawings later; signing up allows saving and managing drawings across devices. The tool includes features like grouping, layers, text/line drawing, and a comprehensive set of keyboard shortcuts for quick diagram creation.
AI named CASCII in December 2025.