Sqemo

Sqemo is a browser-based ER diagram and data modeling tool built around team naming standards. Instead of typing physical column names by hand, you register a glossary (customer ? cust, number ? no) and naming rules (case, delimiter, handling of unknown words) first. You then model in business terms — "Customer Number" — and the physical column name (cust_no) is generated from the glossary, the same way for everyone. Exceptions are allowed but explicitly flagged, so they can't silently spread.

Because the correct name is computable, naming drift becomes detectable: the app includes a linter, and a CLI (npx sqemo-mcp lint) that fails CI when a column deviates from what the glossary would generate. A built-in MCP server (34 tools) lets AI agents read and edit schemas while following the team's naming standard.

Other features:

• Runs in the browser with no signup — models autosave locally (IndexedDB) and live in a plain .erd.json file you can commit to git
• SQL DDL import/export in seven dialects (MySQL, PostgreSQL, Oracle, SQL Server, SQLite, H2, CUBRID) — raw pg_dump/mysqldump output parses as-is
• DBML import/export for easy migration from dbdiagram
• Domain (standard data type) dictionary — define "amount = DECIMAL(18,2)" once and every column using that domain follows
• Real-time collaboration, read-only share links (optionally pinned to a version) and iframe embeds
• Team workspaces: shared glossary, suggestion/approval queue, and a standard-compliance view

The core is free. Pro adds migration ALTER SQL generation and automatic version history; Team adds unlimited workspace members and the compliance view.