Design database schemas visually: add entities with attributes (mark PK / FK), connect them with 1:1, 1:N or M:N relationships, and the ER diagram renders live in SVG with crow's-foot cardinality. Drag, edit or delete anything. Pure front-end.
User), then for each column type its Attribute name, tick Primary key or Foreign key if needed, and click Add attribute; repeat to build the column list. Add entity drops the table onto the canvas — drag any table to reposition it. To link tables, pick a From entity, a To entity and a Cardinality (1:1, 1:N or M:N), then Add relation; the connector is drawn with crow's-foot notation (a bar = "one", a three-toed fork = "many"). Click a table in the canvas (or Edit in the list) to rename it or change its columns; Delete removes a table (and its relations) or a relation. Auto-layout reflows the tables into a tidy grid, Load sample drops in a User / Order / Product demo, Clear all empties everything. The whole diagram is plain SVG rendered in your browser — nothing is uploaded.