I find that bulk of my interactions with LLMs rely on a few frequently used prompts - summarize, make the post more interesting, fix language, do an emoji makeover, simplify etc. Imagine being able to right click on any text on the web, and apply such shortcuts on the selection. This is what rewrite.ly enables. You can build your own personalized productivity toolkit by defining custom prompts - eg "paraphrase in my writing style", or "give solution hints to selected problem" etc.