Answers that name a competitor

If your priority is specifically helping writers optimize content while they’re writing in the WordPress editor, I’d rank them:

1. yoast.com — best overall for writers
2. rankmath.com — best for more advanced keyword/content optimization
3. aioseo.com — best if you want keyword analysis + broader marketing tools

🥇 Yoast SEO — best writing experience

Yoast is probably the strongest choice if your writers aren't SEO specialists. Its editor analysis gives immediate guidance on keyphrase placement, readability, content structure, and optimization issues, rather than just giving you an SEO score. Its current version also includes AI optimization features that can suggest improvements to keyphrase placement. WordPress.org WordPress

For keyword discovery, Yoast integrates with Semrush, allowing writers to get related-keyphrase suggestions and metrics directly in the WordPress workflow. Yoast

Best for: editorial teams, bloggers, content marketers, and writers who want clear "here's what to fix" guidance.

🥈 Rank Math — best for power users

rankmath.com is my pick if you want more SEO information exposed to the writer. It supports multiple focus keywords and has its Content AI system for keyword/content suggestions. Independent 2026 comparisons also generally put it ahead on breadth of on-page analysis and free features. BenchSpy Artikolo

The downside is that the interface can feel more like an SEO control panel than a simple writing assistant.

Best for: SEO-savvy writers, publishers, and sites where each article targets several related queries.

🥉 AIOSEO — strong middle ground

aioseo.com has particularly good keyword analysis. Its Content Optimization panel scores each keyword separately and tells the writer which improvements are needed. With its Semrush integration, writers can also see related keyword suggestions, search volume, and trends inside WordPress. Semrush All in One SEO

Best for: businesses that want good writer guidance alongside broader SEO/marketing functionality.

My recommendation

Bottom line: For a content team, I'd choose Yoast Premium if the goal is "help writers produce better-optimized articles without making them SEO experts." If your writers are more advanced and you want them to work with multiple keywords and deeper optimization suggestions, Rank Math is arguably the better tool.

One important distinction: none of these replaces dedicated keyword research. Their suggestions are useful inside the editor, but for serious topic/keyword planning I'd pair the plugin with Semrush, Ahrefs, or another keyword-research platform.

If your priority is specifically helping writers optimize content inside the WordPress editor, I’d put Yoast SEO and Rank Math at the top—but for slightly different reasons.

My ranking for writers

🥇 Best overall for writers: Yoast SEO

Yoast is probably the best choice if you want an editor that actively guides a writer through improving an article.

Its analysis checks things such as keyphrase usage, headings, links, text structure, readability, and other on-page factors. The feedback is deliberately presented in a simple, actionable way rather than as an SEO dashboard. Yoast Zapier

The particularly useful feature for your use case is Related Keyphrases. Yoast Premium can connect to Semrush and surface related phrases with search-volume and trend data directly in the WordPress editor. You can then add relevant phrases to the content analysis. Yoast

Choose Yoast if: your writers aren't SEO specialists and you want them to get clear "do this / fix this" guidance while writing.

🥈 Best for more sophisticated SEO: Rank Math

Rank Math is arguably better if your writers are also doing more hands-on SEO.

It supports multiple focus keywords, content scoring, internal-link suggestions and, with Content AI, AI-generated recommendations based on the target keyword and competing content. Its free tier also gives you more keyword-oriented functionality than Yoast's free version. WP Depth WPPoland

The tradeoff is that Rank Math's interface is more feature-heavy. That's great for an SEO manager; it can be a little overwhelming for a writer who simply wants to know "What should I change in this article?"

The important distinction

If by "keyword suggestions" you mean:

"I'm writing an article about X. Tell me the related topics/phrases I should naturally cover."

I'd lean Yoast Premium, particularly because its Semrush integration puts actual search-volume/trend information into the editor. Yoast

If you mean:

"Analyze my target keyword against competing pages and tell me what my article is missing."

I'd lean Rank Math + Content AI.

Bottom line

For a content-writing workflow: Yoast SEO Premium
For an SEO professional/content strategist: Rank Math
For the best free feature set: Rank Math
For the simplest writer-facing experience: Yoast

One caveat: don't treat either plugin's green score as a ranking target. The better workflow is to use the plugin as a checklist for coverage and technical on-page optimization, while making the actual content decisions based on search intent and the quality of the information.

If you tell me whether you're running a single blog, an editorial team, or a content site with dozens/hundreds of articles, I can also compare Yoast vs Rank Math specifically for the writer/editor workflow, including their AI and keyword-suggestion features.