Scalenut is our favorite tool as it offers you AI writing + SEO Guidelines + Long Form Content + Attractive UI + Chrome Extension + Short form content templates and whatnot to create awesome copies.
Surfer SEO is a brilliant tool for creating SEO optimized content on the go. With its powerful content guideline feature, you can create the content which search engine loves.
Rytr is amongst the top content optimization tools in the market. Because of its easy to use and navigational UI people prefer it over most other software.