Question: Is there a service that offers a writing assistant with autocompletion and paraphrasing abilities to help with writer's block?

If you're looking for a writing assistant with autocompletion and paraphrasing abilities, QuillBot is a good option. It has a range of tools, including a paraphraser, grammar checker and AI-based writing tools. The interface is easy to use and geared for writers of all levels, with more advanced tools available through its Premium subscription.

Another contender is Wordtune, which offers an AI writing assistant that can rewrite your text, producing error-free, well-constructed content. It also has a summarizer and a range of templates for different content types, so it's flexible and fast. Wordtune integrates with Google Calendar and Microsoft Word, among other apps, and has several pricing levels depending on your needs.

Rytr is another good option, with a variety of AI-based writing tools, including AI autocomplete text, grammar checking and content optimization tools. It can handle a range of use cases and tones, and offers both free and paid accounts. Rytr's Chrome Extension and API let you easily integrate it into your workflow.

Last is ProWritingAid, which offers a range of AI-based tools to help you with your writing, including real-time checks, readability tests and plagiarism checks. It integrates with the big writing software, including Microsoft Word and Google Docs, so it's a good tool for professionals and students. ProWritingAid offers a few different pricing levels depending on your needs and budget.