RSS-lambda transforms RSS feeds without RSS client lock-in.
There are RSS clients that can perform transformations on RSS feeds, e.g. only keep entries with certain keywords, or translate texts of the entries
However, using those features from the RSS clients will create RSS client lock-in that prevents you from moving to another RSS client if you desire
RSS-lambda is an application that perform transformations on the server-side instead so that you can freely move to another RSS client while keeping the transformations. It's also self-hostable so that you don't even need to rely on the official server instance!