Semrush SEO Writing Assistant: Honest Affiliate Guide (2026)
Disclosure: This site earns revenue through affiliate partnerships with other platforms. This article does not currently contain affiliate links for Semrush. Any tool recommendations are based on independent evaluation verified from Semrush’s official knowledge base in June 2026.
The Semrush SEO Writing Assistant is genuinely useful — but only if you are on the right plan, and most articles explaining it skip the most important fact: Free and Pro users can generate up to two SEO Writing Assistant documents per account. Not two per month.
Up to two total. If you publish more than two articles and want to use the Semrush SEO Writing Assistant on each one, you need the Guru plan at $208.33/month when billed annually. Understanding that before you open the tool saves considerable frustration.
I am Andreas Maratheftis, 30 years in professional finance and founder of InnovateHub Finance, where I use Semrush to plan and prioritise content for a growing affiliate site. This guide covers what the SEO Writing Assistant actually does, which plan you realistically need, and how to build it into an affiliate content workflow that produces consistently better-optimised articles.
Quick Answer: What Is the Semrush SEO Writing Assistant?
In brief: The Semrush SEO Writing Assistant (SWA) is a real-time content optimisation tool that analyses your draft against the top 10 Google results for your target keyword and scores it across four dimensions — SEO, readability, originality, and tone of voice.
It works directly inside the Semrush platform, Google Docs, WordPress, and Microsoft Word. The practical value for affiliate publishers is straightforward: it tells you what your draft is missing compared to pages currently ranking, before you publish rather than after.
The key limitation to understand upfront: on Free and Pro plans, you can create two recommendation sets in total — not per month, not per year, but ever. Meaningful use of the SEO Writing Assistant as an ongoing content tool requires the Guru plan at $208.33/month when billed annually. Always verify current pricing directly on Semrush’s official pricing page before purchasing — prices and plan limits change. Everything else in this guide assumes that context.
Semrush SEO Writing Assistant: Plan Limits Explained
Plan limits are the most important thing to understand about the SEO Writing Assistant before deciding whether it belongs in your workflow. Most articles about this tool bury these limits at the end or omit them entirely.
| Feature | Free | Pro ($117.33/mo annual) | Guru ($208.33/mo annual) | Business |
|---|---|---|---|---|
| Documents (recommendation sets) | Up to 2 per account | Up to 2 per account | Unlimited per month | Unlimited per month |
| Plagiarism checks | Verify in account | 3 total per account | 5 per month | 10 per month |
| Smart Writer Words (AI features) | Verify in account | 500 lifetime | 1,000 per month | 2,000 per month |
| Rephraser | Verify in account | Limited | Included | Included |
| Compose (AI writing) | Verify in account | Semrush platform and Google Docs only | Semrush platform and Docs | Semrush platform and Docs |
| Additional Smart Writer Words | Not available | Not available | 10,000 for $20/month | 10,000 for $20/month |
The practical decision point: if you are publishing two or fewer articles per month and want to use SWA occasionally, the Pro plan covers basic evaluation — but you will exhaust your two-document per account limit quickly. If you are publishing weekly or more, the Guru plan is the only tier where SWA functions as an ongoing workflow tool rather than a one-off evaluation. Verify current limits at semrush.com/kb/814 before purchasing — these change.
What the Semrush SEO Writing Assistant Analyses: Four Scoring Dimensions
The SEO Writing Assistant scores your content from 0 to 10 overall, based on four component scores updated in real time as you write.
SEO Score. Evaluates keyword usage — whether your target keyword and semantically related terms appear naturally and with appropriate frequency — alongside internal linking signals and meta description quality. The recommendations come from analysing the top 10 pages currently ranking for your target keyword, not from generic SEO rules. This means the suggestions reflect what is actually working in your specific SERP right now, not a fixed checklist.
Readability Score. Calculated using the Flesch reading ease formula and benchmarked against the top-ranking competitor content for your keyword. It flags long sentences, complicated words, passive voice, and paragraph length against the standard your actual competitors are meeting. For affiliate content, this is useful for understanding whether your writing style is significantly harder or easier to read than the pages you are competing against.
Originality Score. Checks your content against a plagiarism database powered by Copyleaks. For affiliate content built from research across multiple sources, this is a practical safety check — it surfaces passages that too closely mirror existing published content before you go live. Plagiarism checks are limited per plan: 3 lifetime on Pro, 5 per month on Guru.
Tone of Voice Score. Evaluates whether your content maintains a consistent tone throughout — formal, neutral, or informal — and flags shifts that may undermine reader trust or brand consistency. For an affiliate site where the author’s voice is a core E-E-A-T signal, tone consistency across articles matters more than most publishers realise.
The overall score synthesises all four into a single 0-10 indicator. A score above 7 generally indicates well-optimised content. A score below 5 signals meaningful gaps that are worth addressing before publishing. Use the score as a directional signal — a high score does not guarantee rankings, and a low score does not mean the article will fail. It means specific, addressable improvements are available.
How to Set Up Semrush SEO Writing Assistant
The SEO Writing Assistant runs in four environments — and the setup process differs for each. Choose the environment that matches where you actually write, not where the tool is most convenient to install.
Semrush platform (no installation required). Navigate to SEO Writing Assistant from the left-hand sidebar in the SEO Toolkit. This is the fastest way to start — paste your draft or write directly in the workspace, add your target keyword, and the tool begins scoring immediately. This environment includes all features including Compose and Rephraser. Use this version if your drafting workflow is flexible and you do not need to work in a separate application.
Google Docs. Install the SEO Writing Assistant add-on from the Google Workspace Marketplace. After installation, open any Google Doc and access the tool from Extensions → SEO Writing Assistant → Show. The sidebar appears on the right and analyses your content as you type.
Note that your writer does not need a Semrush account to view and use a template you have already created — useful if you are working with freelance writers on your affiliate site. Compose is available in Google Docs.
WordPress. Install the Semrush SEO Writing Assistant plugin from the WordPress plugin directory. Once installed and connected to your Semrush account, the tool appears as a sidebar panel in the post editor. This is the most convenient environment for publishers who draft and edit directly in WordPress. Important limitation: the Compose (AI writing) feature is not available in the WordPress plugin — only in the Semrush platform and Google Docs.
Microsoft Word. Install the SEO Writing Assistant as a Word add-in. The same Compose limitation applies — AI writing features are not available in Word. For affiliate publishers who draft in Word, the core SEO, readability, originality, and tone scoring is fully functional.
How to Use the SEO Writing Assistant for Affiliate Content: Step-by-Step
The most effective workflow for an affiliate publisher treats the SEO Writing Assistant as a post-draft optimisation step, not a writing-from-scratch tool. Write your article first — with your own perspective, experience, and editorial judgement — then use SWA to identify specific gaps before publishing.
Step 1: Create a new document. Open the SEO Writing Assistant in your preferred environment. Enter your focus keyword and select your target country. SWA immediately analyses the top 10 ranking pages for that keyword and generates your recommendation set — the benchmark your draft will be compared against. On Guru, you can create a new recommendation set for every article. On Pro, remember you have a two-document-per-account limit.
Step 2: Paste your completed draft. Do not start writing in the tool — write your article in your normal workflow first, then paste the completed draft. This preserves your authentic voice and editorial judgment rather than letting the tool’s suggestions shape your writing from sentence one. SWA is most effective as a quality check, not a writing assistant in the literal sense.
Step 3: Review the SEO recommendations. SWA shows which recommended keywords are present, which are missing, and how your keyword density compares to top-ranking pages.
For each missing keyword, judge whether it belongs in your article editorially — add it if it genuinely improves the content, skip it if it would feel forced. Mechanical keyword insertion scores points in the tool but damages reader experience and E-E-A-T signals. Our guide on Semrush keyword difficulty covers how to evaluate which keyword opportunities are worth pursuing in the first place.
Step 4: Address readability flags. SWA highlights long sentences, passive voice, and complicated words. Each flag is worth reviewing but not mandatory to fix. An affiliate article written by a human with genuine expertise will sometimes use complex language appropriately. Fix the readability issues that genuinely improve clarity; leave the ones that would make your writing sound generic.
Step 5: Run the plagiarism check. Before publishing, run the plagiarism checker, particularly on sections written with heavy research input. A high similarity score on a specific passage is worth reviewing — not necessarily to rewrite everything, but to ensure you are adding genuine value beyond what the source already covers. This step uses one of your monthly plagiarism check allocations on Guru.
Step 6: Check tone consistency. If the tone score flags inconsistencies, review the highlighted sections. For an affiliate site where the author’s consistent voice is a trust signal, significant tone shifts between sections undermine credibility. This is especially relevant when incorporating research-heavy sections alongside personal commentary. Our Semrush competitor analysis guide covers how consistent, authoritative content supports topical authority building across a site.
SEO Writing Assistant vs Writing Without a Tool: The Honest Comparison
The Semrush SEO Writing Assistant saves time on one specific task: identifying which semantically related keywords the top-ranking pages use that your draft is missing. That task — done manually — requires opening 10 competitor articles, reading each one, noting the recurring terms and topics they cover, and checking your own draft against that list. SWA compresses this to approximately 5 minutes and produces a structured output rather than a manual note.
The original calculation worth making: a publisher writing four articles per week at Guru ($208.33/month annual) pays approximately $13 per article for the complete Guru toolkit — keyword research, site audit, position tracking, backlink analysis, and SWA combined. The time saved on competitive content analysis alone (approximately 30-60 minutes per article) justifies this easily once you are publishing consistently.
Where SWA does not add value: it cannot evaluate whether your editorial angle is genuinely differentiated, whether your personal experience adds credibility, or whether your affiliate recommendations are trustworthy. A well-optimised article with a generic perspective will underperform a slightly less optimised article with genuine expertise and a clear author voice.
Use SWA to close technical gaps, not to substitute for substantive thinking. For a full assessment of whether Semrush’s toolkit justifies the cost at your current site stage, our guide on whether Semrush is worth it covers the complete cost-benefit framework.
When Semrush SEO Writing Assistant Is Not the Right Tool
SWA is a content optimisation tool for existing drafts. It is not the right tool for several tasks that affiliate publishers frequently attempt to use it for.
Generating content from scratch. The Compose feature writes content, but the output requires substantial editorial revision to reflect genuine expertise and a specific author voice. For an affiliate site where E-E-A-T signals are core to trust, AI-generated first drafts need heavy editorial investment to be publishable — often as much work as writing from scratch. The SEO Writing Assistant is more useful as a quality check on human-written content than as a generation tool.
Keyword research and content strategy. SWA tells you what keywords to add to an existing draft. It does not help you decide what to write about, which keywords to target, or whether a topic is worth the effort. Use the Keyword Magic Tool and Topic Research for those decisions first. Our guide on Semrush Topic Research covers the ideation workflow that should precede SWA use.
Technical SEO auditing. SWA checks on-page content quality. It does not crawl your site for broken links, check page speed, identify crawl errors, or flag indexing issues. Use Site Audit for technical SEO health monitoring separately from your content optimisation workflow.
Common Mistakes When Using Semrush SEO Writing Assistant
Chasing a perfect score at the expense of readability. A score of 10 means your content mechanically satisfies every recommendation from the top-ranking pages. It does not mean the article is better, more useful, or more trustworthy than a score of 7. Affiliate publishers who optimise primarily for SWA score often produce content that reads as if it was written for a tool rather than a reader. The score is a signal, not a target.
Using the Pro plan for ongoing content work. Two lifetime documents is genuinely not enough for a publishing operation producing weekly content. If you intend to use SWA on every article you publish, price in the Guru plan cost from the outset rather than discovering the limit mid-workflow.
Writing in the tool rather than pasting a completed draft. Writing directly in SWA while watching the score update in real time encourages optimisation-led writing rather than reader-led writing. The score influences your word choices in ways that often produce mechanical, over-optimised text. Write your complete draft first, then use SWA to review and refine.
Ignoring the tone of voice score on multi-section articles. Long-form affiliate articles often shift tone between sections — a formal introduction, a technical comparison table, a conversational FAQ. SWA flags these shifts. Review them to ensure the transitions feel intentional rather than disjointed. Consistent tone is a stronger E-E-A-T signal than a technically optimised but jarring article. For a full breakdown of Semrush’s content tools and how they fit together, read our full Semrush review.
What To Do Next
If you are on a Guru plan, open the Semrush SEO Writing Assistant now and run it on your most recent published article — not a new one. Paste the existing content, enter the focus keyword, and review the recommendations. Treat this as a calibration exercise: understand what SWA flags on content you have already published before using it as part of your pre-publish workflow.
The gap between your current articles and the tool’s recommendations tells you which specific aspects of your content deserve the most attention going forward.
If you are on a Pro plan and considering upgrading: use your two available document allocations on articles in your highest-traffic topic cluster. The SWA recommendations on those two articles give you a clear read on whether the tool surfaces actionable improvements that justify the Guru plan cost for ongoing use. Our Semrush pricing guide covers exactly what the Guru plan includes beyond SWA to help you evaluate the full upgrade decision.
Frequently Asked Questions
Is the Semrush SEO Writing Assistant free?
Partially. The SEO Writing Assistant is accessible on the free Semrush account and on the Pro plan, but with a lifetime limit of two documents — meaning you can create two recommendation sets in total before the tool is no longer usable at those tiers. Unlimited monthly documents require the Guru plan at $208.33/month when billed annually. A 7-day free trial of paid plans is available with a card required.
Does the Semrush SEO Writing Assistant work with Google Docs?
Yes. Install the SEO Writing Assistant add-on from the Google Workspace Marketplace. After installation, open any Google Doc and access the tool from Extensions → SEO Writing Assistant → Show.
The sidebar analyses your content as you type and updates the score in real time. Google Docs supports the core SEO Writing Assistant sidebar, recommendations, scoring, Compose, and Rephraser. One important limitation: issue highlighting — where the tool marks specific text sections with colour-coded flags — is only available inside the Semrush SEO Writing Assistant editor, not in Google Docs, WordPress, or Microsoft Word.
What is the difference between SEO Writing Assistant and SEO Content Template in Semrush?
The SEO Content Template analyses the top 10 ranking pages for your keyword and produces a structured content brief — recommended word count, target keywords, readability benchmark, and suggested external links — before you write.
The SEO Writing Assistant analyses your draft against that same SERP data and scores it in real time as you write. They are sequential tools in the same workflow: Content Template for the brief, Writing Assistant for the draft review. Both are included in the Guru plan.
Can my writers use the Semrush SEO Writing Assistant without a Semrush account?
Yes, with limitations. If you share a Google Doc that already has an active SEO Writing Assistant recommendation set, a writer with the free Google Docs add-on installed can view and use the recommendations without a Semrush account of their own. They cannot create new recommendation sets or access the tool in the Semrush platform directly. This makes Google Docs the most practical integration environment when working with freelance writers on an affiliate site.
What are Smart Writer Words in the Semrush SEO Writing Assistant?
Smart Writer Words are the usage credits consumed by AI-powered features in the SEO Writing Assistant — specifically the Compose, Rephraser, and Ask AI functions. Each word generated by these features consumes one Smart Writer Word credit.
Pro plan users have 500 lifetime Smart Writer Words. Guru plan users have 1,000 per month. Additional packs of 10,000 words are available for $20/month for Guru and Business users. Once lifetime credits on Pro are exhausted, AI features in SWA are no longer accessible at that plan tier.
Final Thoughts
The Semrush SEO Writing Assistant is a genuinely useful post-draft quality check for affiliate content publishers — it compresses 30-60 minutes of manual competitive content analysis into a 5-minute scored review. Its practical value is in identifying missing semantic keywords, flagging readability gaps relative to what currently ranks, and checking tone consistency across longer articles.
Used correctly — as a review tool on completed drafts rather than a writing-from-scratch assistant — it consistently surfaces specific, addressable improvements that are worth making before publishing. Used incorrectly — as a score to chase at the expense of genuine editorial quality — it produces over-optimised content that serves a tool’s metrics rather than a reader’s needs.
The plan limit is the deciding factor: if you are publishing more than two articles total and want SWA in your ongoing workflow, the Guru plan is the realistic minimum. For a complete breakdown of everything Semrush includes at each plan tier and whether the investment makes sense for your affiliate site at its current stage, read our full Semrush review.
- Semrush Pricing Explained — every plan tier, limit, and what Guru includes beyond SWA
- Semrush Topic Research — the ideation workflow that runs before SWA
- Semrush Keyword Difficulty — choosing the right keywords before optimising your draft
- Semrush Content Toolkit — the standalone content creation platform at $60/month
- Is Semrush Worth It? — cost-benefit framework by site stage
All SEO Writing Assistant features, plan limits, and pricing verified from Semrush’s official knowledge base in June 2026. Pricing confirmed at semrush.com/prices. Always verify current limits and pricing directly on Semrush’s official pages before purchasing — these change frequently. For independent context, Backlinko’s Semrush review provides a useful third-party perspective on SWA’s capabilities.
