Show HN: Tree-merge.com. Merge e-commerce categories with a web UI

Hello, I built this web UI to merge multiple tree based e-commerce categories into one "super tree". You can export the super tree as JSON, and import it into another system such as a search engine. Users can then select a single category and view items from all of the semantically equal categories. The app is here: https://app.tree-merge.com/ https://app.tree-merge.com/ You can download the sample categories and use them to demo the UI.