ER Diagram: Design database schemas online — free, no signup needed

Hey Product Hunt 👋 I'm the maker of ER Diagram. This started from a small annoyance: I just wanted to sketch a database schema — five tables, a couple of foreign keys — and every tool I tried made me create an account and confirm my email before I could draw a single box. For a thirty-second sketch. So I built the thing I wanted: you land on the page and start drawing immediately. No signup, no modal, nothing in the way. Guest diagrams are saved locally in your browser, so a reload won't wipe your work. You only need an account if you want cloud sync or sharing. A few things it does: • Import & export SQL DDL and DBML — it round-trips, so you're never locked in • Drag-to-connect foreign keys, auto-layout, PNG/SVG export • Prebuilt schema templates (e-commerce, blog, SaaS, hospital, and more) • Works in 10 languages On the tech side: it's SvelteKit (Svelte 5) with a Canvas renderer (LeaferJS) instead of DOM nodes, so it stays smooth even with a lot of tables. It's free to use. I'd genuinely love your feedback — especially if you throw a messy real-world schema at it and the layout does something silly. I'll be around all day answering questions 🙏 → https://erdiagram.dev/?utm_sourc...