My understanding is that Tauri is designed for using a Rust back end (i.e. the code responsible for creating windows, and native platform interop), with arbitar

My understanding is that Tauri is designed for using a Rust back end (i.e. the code responsible for creating windows, and native platform interop), with arbitary html+javascript front-end. One can think of it more as a way of creating a web-tech based UI for your program otherwise written in rust. Astrodon on the other hand appears to be designed around allowing you to write the back-end in javascript running on Deno, with the front end still being arbitrary html+javascript. The net result being more akin to a deno powered electron (instead of a node powered one).