OWOX Model Canvas vs DrawSQL: ERD Tools Compared
Polished collaborative ERDs vs a portable, AI-readable data model (OKF export). Both free — which fits your team?
DrawSQL and OWOX Model Canvas are both free, browser-based ways to draw a data model – and both are pleasant to use. The difference is what you're optimizing for.
DrawSQL makes beautiful, shareable diagrams.
OWOX Model Canvas makes a portable, AI-readable model that happens to also render as a diagram.
If you want a picture for a doc, DrawSQL is a fine choice. If you want the model to travel – into git, into another tool, into an LLM, be the source that drives you report – read on and use it, it’s free. For the wider field, see our best free ERD tools roundup; this is the head-to-head.
TL;DR
- Pick DrawSQL if your main goal is a polished, collaborative ERD you'll drop into documentation or share with stakeholders.
- Pick OWOX Model Canvas if you want the same visual model plus an open export (OKF) you can version, hand to an AI, or push into a warehouse – free, open-source, and with no sign-up.
Side by side
Where DrawSQL wins
DrawSQL's strength is presentation. The diagrams look good out of the box, sharing is easy, and for teams that mostly need to communicate a schema – in a design doc, an onboarding wiki, or a stakeholder review – that polish is genuinely valuable.
If your deliverable is a clean picture of the schema and collaboration on that picture, DrawSQL does it well. OWOX Model Canvas isn't trying to out-pretty it.
Where OWOX Model Canvas wins
OWOX Model Canvas adds three things DrawSQL doesn't (as of July 2026):
- AI drafting – describe the model in plain language and let AI draft the tables and joins, then refine visually.
- A portable, AI-readable output – it exports OKF (Google's Open Knowledge Format), plain markdown you can commit to git, review in a pull request, or feed to an LLM as context so text-to-SQL stops guessing your schema.
- Open and free – Apache-2.0, no sign-up, opens Google's official GA4, Stack Overflow, and Bitcoin samples, and can push a model into governed OWOX Data Marts.
The canvas with tables, keys, and join paths – the same model exports to OKF (portable markdown) or an image.
The real difference: a picture vs a model
Both tools draw the same kind of ERD. The distinction is the artifact you walk away with. DrawSQL's output is a diagram – for humans.
OWOX Model Canvas's output is a model – an open spec a machine can read.
That matters more in 2026 than it did a year ago: AI assistants now need a trustworthy, machine-readable description of your data, and a PNG can't be one. An OKF file can. If your diagram only needs to be looked at, DrawSQL is enough; if it needs to do work downstream, the portable model wins.
Which should you choose?
- You need a beautiful, collaborative diagram for a doc → DrawSQL.
- You want a model that's portable, versionable, and AI-readable → OWOX Model Canvas.
- You don't want to sign up or pay → OWOX Model Canvas (free, anonymous, open-source).
New to modeling? Start with our guide to data modeling or grab a template; prefer a code-first tool instead? See OWOX Model Canvas vs dbdiagram.io.
Frequently asked questions
Finally, a tool that doesn't ask business users to learn a new dashboarding UI. Our marketing team already knows Sheets. OWOX just delivers the right data.
Joinable data marts concept was the thing that sold us. We can now use the semantic layer without building one.
Self-hosted the OSS version on Digital Ocean. Zero vendor lock-in. Contributed a Shopify connector back in week two.