To import, you plug in your iPhone, select a folder, and hit Import. Subsequent imports into the same folder only copy new files.
It’s built with Rust and Tauri, with a Svelte UI (can very much recommend that stack now), and it is open source (MIT).
Please note: This is the initial release, so even though I tested it on all three platforms and have been using various earlier versions for a while now, there are probably still some minor bugs. Also, it is not signed, so Windows/macOS might complain.