Can I use the SEO Writing Assistant without a Semrush account?

In order to run the SEO Writing Assistant, you will need an Semrush account to create an SEO Content Template. 

Please note: Free users and users with a Pro SEO Toolkit plan can create a Content Template only once. The Content Ideas tools in Semrush (which include Topic Research, SEO Content Template and SEO Writing Assistant) are fully available with the Guru or Business SEO Toolkit subscriptions. Read more about SEO Writing Assistant limits.

If someone (e.g. your Content Manager) has already connected a document to SEO Content Template, anyone who has access to the document will be able to see the SEO Writing Assistant interface.