I have to take a deeper look at the LDA model method first so I can't say too much about this right now. But one key focus in this project was explicitly NOT to use methods that need "more processing power" or a backend-service, e.g. and instead use a seemingly "trivial" method like looking for occurencies matched with a keyword-list. But maybe LDA can also be implemented in a frontend package? I will take a look, thanks for the hint. And it would also be helpful for me if you can give me some info about the other "similarly established methods". Thank you!