Autocrit is great for editing longer form text. It's less designed for short email and Slack threads. If you are writing a short story or novel it's fantastic. It can also be well used for longer form pieces such as articles and interviews. I would not personally use it to write my content in its first draft. It has a word editor but it's not as fully featured as your typical writing programs.
As I am a content marketer, every day I have to fight to get top-ranked for my articles. So, SEO should be perfect. For my content side of SEO, MarketMuse is a lifesaver to me. It helps me to plan my content, get the score of my content, and the suggestion to optimize my articles. It saves my time and money too.
The support I have received from all MarketMuse staff at each step of the process has been excellent. They are very friendly, quick to assist, and also provide really good training to teach you how to use their product. Additionally, their own blog is a wealth of information regarding different aspects of content marketing, from articles to video interviews.
Grammarly is good at the grammar and spelling stuff but the deeper analysis is lacking. Autocrit and Grammarly make a solid pairing as you can incorporate grammarlies tools with Autocrit for a full package. The same can be done with pro writing aid.
MarketMuse is more cost-effective than BrightEdge and does more for writers and editors that are strictly focused on content. It keeps people in one system after their first draft. Writers and editors do not need to go into multiple tools to look things up manually, saving valuable time. This enables them to produce more content more quickly.