We need to write an in-depth article about monthly cost breakdown of leading AI writing tools. Must include internal links (2-3) from provided list. Must not include TOC, Key Takeaways, FAQ, CTA. Must be at least 1000 words. Must use HTML tags, no markdown. Must have H1 title containing exact focus keyword. Must not repeat exact keyword in multiple subheadings. Must maintain keyword density 1-1.5%. Must use transition words in at least 30% sentences. Must keep paragraphs short (2-3 sentences). Must include internal links using tags with href.