The premium package covers everything covered under the Popular package and additional checking like- captions (images, illustrations) This is the most exhaustive proofreading service that you need. It goes well for business plans, complex proposals, advertisements, brochures, product catalogs, instruction manuals, project reports, wherever there's important or substantial graphic & pictorial content, and wherever a high level of document scrutiny is desired. The rate given is for up to 2000 words maximum per hour.