Is draw.io Desktop completely free and open source?

Yes. draw.io Desktop is released under the Apache 2.0 license. There are no paid tiers, feature locks, or telemetry. The source code is available on GitHub.

Can I use draw.io Desktop on a machine without internet access?

Absolutely. The desktop app is designed for offline use. All diagramming features work without a network connection, and files are saved locally.

Does draw.io Desktop support Visio file import?

Yes. It can import.vsdx (Visio 2013+) files directly. Older.vsd formats are not supported, but you can convert them via Visio or the online draw.io converter first.