Free SQL→ER diagram tool, runs in the browser, nothing uploaded

100/10 for mobile usability. Panning, Zooming, selecting and moving was so seamless I thought I was tripping out.

Could we have the option of straight lines and 90 degree angles? I’ve never really liked the bendy ones. Looks cool, good job!

It's a small too nothing great I just figured others might find it useful too. I kept finding myself needing to visualize database schemas, but most tools had the same problems: paywalls, mandatory signups, or sending your SQL to someone else's server.

No backend, no accounts, no data leaving your machine.

A few implementation details that were fun:

* Built on <canvas> instead of DOM/SVG. Tables are rasterized into cached bitmaps with viewport culling, which keeps things smooth even with hundreds of tables on screen.

* The SQL parser tracks source spans for every token. That lets edits stay surgical so a rename a table and only the relevant identifier (and its references) change while comments and formatting remain untouched.

* The URL contains the entire schema. Sharing simply serializes the schema into the URL itself, so there's no backend, no stored state, and no account required.

* I also experimented with a Rust/WASM version because why not? but the parser was ~37% slower because the JS↔WASM boundary cost outweighed the compute savings but The O(n^2) overlap-resolution pass was about 2.2x faster though * In the end I stuck with plain JavaScript. No framework ~32KB gzipped

There's also Azimutt: https://azimutt.app/gallery

Maybe you can support schemas in more dialects by using a similar approach to a little tool I made: sqlscope.netlify.app

Basically integrate sqlglot to translate the schema between dialects and then use a base dialect for generating the schema.

The two tools seem complementary and you seem to be a better designer, so it would be nice to see it all together

I was looking for it, thanks! Great work!

The GitHub link takes you to the front page of GitHub instead of the actual project.

Okay thats pretty cool. Nice job!