ERD Designer vs Schemity
ERD Designer
kajitiluna.github.ioSchemity
schemity.comSide by side
| Figure | ERD Designer | Schemity |
|---|---|---|
| Price from | Free | $2.42/mo |
| Free plan | Yes | Yes |
| Free trial | — | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | — | Yes |
| Plans published | 1 | 8 |
| Spec score · Database Design Tools | 7.6 (#17) | 8.8 (#4) |
| Database support | It generates DDL for PostgreSQL, MySQL, MariaDB, MS SQL Server, SQLite, BigQuery, and Snowflake. | The site lists PostgreSQL, Supabase, MySQL, MariaDB, SQL Server, and SQLite as supported databases. |
| Local storage | The browser version stores design data locally in the browser using IndexedDB. | Schemity stores work as plain JSON files on the user's machine, which can be version-controlled with Git. |
| Support | The project directs users to GitHub Issues for bug reports and feature requests. | The maker invites users to contact the creator directly about team purchase needs such as invoices, offline activation, security review, or volume licensing. |
Plans
Schemity
- EducationFree
- Education licenseFree
- Free trialFree
- LiteFree
- Schemity LiteFree
- Updates renewal$29 a year
- License$129, paid once
- Licensed desktop$129, paid once
In their own words
ERD Designer
ERD Designer has no write-up on Specifiction yet; its figures are above.
Schemity
Schemity is database design software that connects to live databases and previews proposed schema changes before they are applied. It lists PostgreSQL, Supabase, MySQL, MariaDB, SQL Server, and SQLite support. A migration displays its proposed changes and effects, and runs only when the user clicks Migrate. Design tools include ERD creation, inferred relationships, SQL and DBML import, check constraints, junction table generation, and schema linting across 26 problem classes. Its local MCP server offers 16 tools for Claude Code, Claude Desktop, Cursor, Codex, OpenCode, and other MCP hosts. The desktop app stores work in plain JSON files that can be version-controlled with Git. It has no cloud backend, accounts, analytics, or telemetry, but transmits an automatically generated machine ID and country code for license verification. A two-week desktop trial unlocks every feature without a credit card. After it ends, offline design remains available, while live database features and Context Views pause until a license is active. Lite is free; the License is $129 one-time.