Atelier Merise — ER Diagram Editor
A local-first visual workspace for designing Merise entity-association models, documenting data rules, and exporting reusable JSON or presentation-ready PNG files.
From business concepts to a reviewable data model
The editor brings entities, typed attributes, associations, roles and cardinalities together on an infinite-style canvas. A built-in commerce model makes the notation immediately explorable, while grid snapping, zoom, panning and multi-selection support larger diagrams.
Portable by design
Work is saved in the browser without an account or server upload. Strict import validation protects the current model from malformed references, and reversible commands keep creation, editing, movement and deletion auditable through undo and redo. JSON preserves the complete model; high-resolution PNG export supports reviews and documentation.