Thanks for the link. Quite a collection. Have you thought about auto suggesting categories when adding new items? Cheap and fast way: Use fastText or Fast Sentence Embeddings to calculate average embeddings for all items in each category. Then, when user enters a new link, create embeddings and rank categories based on the new embeddings’ similarity to those of the categories.
I think there's plenty of scope for improvements like this. I haven't had the energy to pursue further improvements along these lines, but I suspect they could make it a better app.
