6 Best SEO Writing Checkers: Real-Time Content Optimization and Analysis Tools

Pankil Shah
by Pankil Shah
Updated On: October 9, 2023
6 Best SEO Writing Checkers: Real-Time Content Optimization and Analysis Tools

A recent study of 1+ billion pages by Ahrefs found that a staggering 90.63% of web pages don’t get any organic traffic. But a study done by Brightedge showed that 63% of online experiences started with a quick online search.

This can only mean one thing — not many sites make it to the first page of Google. Why not? Well, if it was easy enough for those 90% of web pages, no one would be making any money!

The art of ranking has evolved, and in 2023, it requires a novel approach to SEO writing. It’s crucial to follow the E-E-A-T principles (Expertise, Experience, Authority, and Trust) to create high-quality content that meets the latest guidelines. And believe it or not, you can take one look at a piece of content and determine whether or not it meets these standards.

With Google on the night watch and the prevalence of “SEO first” content, you need a more refined approach that lets you check the content for SEO as well as these new standards set by Google.

Choosing the right SEO writing checker or assistant can take away almost all your pain. But choosing the wrong one can be disastrous — costing you 10 times more pain from a significant drop in rankings and lost opportunities for improvement.

So let’s dive into the core features you’ll need in an SEO writing checker before we show you the top tools in 2023 that can help you with predictable content success.

What Are SEO Writing Checkers and On-Page Optimizers?

An SEO writing checker is a tool that analyzes web content to ensure it’s optimized for search engines. It can point out where your content needs to improve, like NLP terms, intent, images, keyword density, meta tags, links, and other on-page SEO factors. This helps you improve your content.

SEO writing checkers help content writers and editors optimize content for search engines before publishing the content. Having the right tool can help you predictably rank for content.

What Is Real-Time or On-Page Analysis?

Real-time content analysis is the process of analyzing web content or page in real-time, as it’s being created. This includes identifying and addressing potential issues with the content, such as poor grammar, style, or structure. It also helps ensure the content is optimized for search engine ranking. 

This analysis involves studying the competing webpages in SERPs and benchmarking all on-page SEO factors to come up with a better strategy to outrank them. The right SEO writing checker and assistant can perform most of this analysis using automation and AI.

9 Features for the Best Content Optimization Toolkit

1. SEO Scoring: Real-Time Content Scoring

SEO scoring keeps track of the on-page elements that are important for ranking. The scoring is calculated by benchmarking these factors against the completed product. Most tools score the content using NLP and keyword density. 

While NLP term coverage is a big ranking factor, other factors are equally important. A good SEO writing checker should have a comprehensive scoring system to assess all the important on-page ranking factors.

Image of a content score with different areas of assessment, like title, description, outline, content, media, and links.
For a clearer perspective, assess your content from different angles.

Top 5 Elements Your Tool Should Score

  1. Title and description
  2. Content (Outlines, NLP terms, Uniqueness, Structure, depth)
  3. Link structure
  4. Media
  5. Semantic terms

2. Meta Tags Optimization: Title and Description

Your title is one of the most important on-page SEO factors. A good tool should guide you into creating an SEO-optimized title. For example, it should help you create a title with high CTR potential, the right keywords, necessary length, and most of all helps you meet the user’s search intent.

Image of the criteria to rank titles: targeted words, search terms, and length.
And although meta descriptions are less important, they’re still a ranking factor. So don’t copy other websites that don’t pay any attention to it. Instead, optimize your descriptions with the right keywords.

3. Content Structure Optimization: Outline, Tables & Lists, Word Count

A good SEO content checker should evaluate the ranking pages and suggest ideal word count, outlines, and terms to use to outrank the top pages. A great checker will go the extra mile to include the amount of tables, list items, and statistics used by competing webpages. 

Google heavily monitors webpages for user experience and content depth. So, you should aim to include a good amount of UX-enhancing elements per your checker’s suggestions, and gain an edge over other pages who aren’t tapping into these factors.

Image of the content scoring criteria: targeted words in outline, H tags, and search terms in H tags.
Don’t neglect your UX!

4. Content Uniqueness

Most content writers and researchers that don’t have the subject matter expertise refer to the SERPs for information to write about. As a result, the content’s originality may be lost as many of the same concepts are already ranking.

Image of the criteria to rank content uniqueness.
Don’t parrot other content creators, make your website stand out.

While Google likes seeing comprehensive content that covers all topical areas, it also wants to see content that brings something new to the table. And because people have been generating a lot of AI content, content uniqueness is even more valuable in 2023. The right writing checker tool should be able to tell you if your content meets the uniqueness requirements.

5. Topics and NLP Terms: Coverage and Term Map

Google uses NLP to interpret text, search queries, and even video and audio content. So, natural language processing (NLP) is an integral part of understanding search queries and content.

With the introduction of the BERT and MUM updates, Google has a better understanding of complex and conversational queries, and can interpret text questionnaires in documents.

With NLP, Google can identify entities in search queries, understand the semantic meaning of a search query, and identify the search intent. This helps refine the search term and provide more accurate search results.

Therefore, having a comprehensive understanding of topics and NLP terms when checking your content is essential to ensure it’s optimized for search engine rankings.

A good tool will provide a term map and comprehensive information on these topics.

Image of a term map for NLP analysis.
Understand what NLP terms are ranking and use those for your advantage.

6. Keyword Density: Frequency Increase or Decrease

Though keyword density was once an important factor for SEO, modern search engine algorithms are now smart enough to understand the content of a page. This means the algorithm can know how well your content matches users’ search intent, without relying heavily on keywords. 

Google has confirmed this, with Matt Cutts and John Mueller both stating that there is no hard and fast rule for keyword density and that SEOs should focus on writing content in a natural way. So always avoid keyword stuffing because this will backfire.

Quotes from Matt Cutts and John Mueller. "I would love it if people could stop obsessing about keyword density.... There's not a hard and fast rule." "Keyword density, in general, is something I wouldn't focus on. Make sure your content is written in a natural way."
Take it from the pros, and write content that reaches hearts, not word counts.

Rather than overusing the target keyword, you should focus on covering the topic as fully as possible. Cover subtopics that the searches are expecting, and make your content comprehensive enough to provide readers with the info they were looking for. 

A good tool will find a good balance between too much and too little, providing the density you need to ensure you haven’t overemphasized the keyword. 

7. Media: Alt Text, Images, and Video

Checking content for SEO also means checking it for the right amount of images, videos, and proper alt tags. Your content should consist of an optimal number of images and all the important alt text terms.

A good SEO writing checker will suggest how to optimize content for each of these factors by showing benchmark results against the competitors.

Image of the criteria to rank media: images, alt text, and videos.
An image is worth a thousand words, so use it wisely!

8. Link Optimization: Internal and External Links with Anchor Text

While internal linking isn’t a direct ranking factor, it helps you pass authority and help other pages rank better on your website. On top of that, external links have been proven to be a ranking factor.

A good SEO writing checker should be able to access the anchor text, understand semantic terms, and be able to suggest content you can link to and from within your website. It should also show you common external links used by competing webpages. Your SEO checker should even provide insight into how many external and internal links you need in your content.

Image of the linking criteria and recommendations.

9. Optimization for Readability

Who would want to read gibberish? If readers can’t make sense of what they’re reading, they won’t stick around. Having good readability comes from understanding your audience. It’s all about balance — you can’t talk to a nuclear physicist in child terms.

Most tools can suggest if the content’s readability is 5th grade level or 8th, but the true sense of “perfect readability” should come from the writer’s experience and know-how of the audience. Most SEO writing checkers would rely on external tools like Hemingway Editor or Grammarly for readability optimizations.

Screenshot of the grammarly recommendations for the paragraph above.
Optimizing your language will help you maintain your reputation and ensure readers will stay on your page!

6 Best Tools for Checking SEO Writing or On-Page Content Optimization and Analysis

1. Outranking

Outranking is one of the most advanced SEO writing checkers that examines content for the most important on-page SEO writing factors. As the most comprehensive on-page SEO checker that combines the data from SERP analysis with AI research capabilities, Outranking works to help you reach predictable content success.

Top Outranking Features

Real-Time SEO ScoringBenchmarks 20 competing pages from SERPs to give real time scoring of the most important on-page SEO factors
Title and DescriptionChecks against important words and semantic terms to use in title and description to improve your content’s organic reach
OutlinesProvides complete breakdown of outlines, how many headings and subheadings you need, what terms to include, and what semantic terms to target
Word CountSuggests words to target in the content for a comprehensive coverage of all the concepts around the primary keyword and its surrounding entities
Common NLP TermsChecks your content against common NLP terms or topics used by competing web pages along with the range of usage for each term nicely laid out in the term map
Unique EntitiesSuggests the number of unique entities to target by benchmarking your content against the competing web pages
List and TablesSuggests the ideal number of list items and tables to use in your content
StatisticsChecks your content for the appropriate number of statistical data used in your content against the competing web pages
Competitor VisualizationProvides a nice visualization chart showing content elements and other important data of competing web pages. This gives many ideas of what pages are great at content and which rank because of authority
Media OptimizationGives the average and max consumption of images and videos, shows the most common alt-text terms, and checks the content against these data points
Internal and External LinksOffers an SEO content editor that checks the content and can connect with your sitemap URL and suggest internal links in the same slip to link to. It can also suggest common external uses by completion along with a benchmark of how many competing webpages are using
Featured Snippet OptimizationChecks your content for patterns and suggests optimizations. While this is not a ranking factor, optimizing your SEO writing for featured snippets can help you get past some tough competition and rank for featured snippets. 


Outranking’s pricing starts at $49 and can go up to $239 for higher plans. A $7 free trial is also available.

2. SurferSEO

If you want to optimize your blog post based on keyword density, SurferSEO is another good tool. It’s quick and easy to use, and it gives you insights into improving your content based on topic density and coverage. 

While Surfer also scores some additional on-page factors such as outlines and word count, and suggests related keywords to add, it still primarily scores your content based on keyword density.

And although this method is ancient and outdated, it might work for those who still prefer to use it. SuferSEO has been out there for a while, which makes them a decent contender.

Screenshot of SurferSEO.
You can see that Surfer still likes to focus on keyword density.


  • Offers a basic SEO writing checker
  • Connects with plagiarism checker
  • Is simple to use



SurferSEO starts at $59/Month and goes up to $239/Month for higher plans.

3. Frase

While Frase is a good topic optimization tool, its on-page optimization is basic and not as comprehensive as some of the other options available. In a crowded market with options and ideas being constantly recycled, Frase makes it to the top.

Like most SEO writing checker tools, Frase also uses Google NLP engine BERT to extract the entities. It provides some basic semantic keywords suggestions but its core is centered around topics.

Screenshot of Frase.
Check your phrases with Frase.


  • Good for basic NLP terms optimization
  • Variety of features related to writing with AI
  • Beginner-friendly and affordable


  • Lacking advanced content optimization capabilities
  • Not-so-friendly customer service


Frase is relatively cheaper, with pricing starting at $12.99 for 4 documents, and up to $114 for higher plans.

Followup Read: Frase Vs. Marketmuse Complete comparison

4. Clearscope

Clearscope is an easy-to-use SEO writing checker that uses topic coverage and density along with readability as a scoring method for their checker. Clearscope also provides a term map and some visualization of competition along with Google Doc integration.

Clearscope can be somewhat useful, however, it doesn’t offer advanced SEO content optimization features like Outranking. It only offers basic content topic optimization.

The not-so-clear scope of clearscope.
Screenshot of clearscope.


  • Basic SEO writing checker
  • Ideal for simple content processes
  • Easy to use


  • Focus still on keyword density
  • Expensive pricing for fewer robust features
  • Limited integrations available


Clearscope is one of the more expensive tools out there as it starts at $170 for 10 documents at a whopping $17 per document.

5. Marketmuse

Marketmuse claims to scan many pages and extract entities (NLP terms) from them. It then uses a topic coverage map to suggest the topics to include in your content briefs. It’s also a comprehensive topic coverage tool to check content gaps for NLP terms. 

Check the below example of pet blogging using Marketmuse that shows keywords like Riveting pet blog and “maggie marton” which aren’t that relevant when it comes to writing about pet blogging. Some anomalies exist in all tools, and while that isn’t necessarily a bad thing, it’s not justified considering the hefty price tag.

Marketmuse will inspire you to write about Maggie Marton in your pet blogging journey.
Screenshot of the Marketmuse interface.


  • Great deal of NLP terms
  • Very simple to use
  • Free plan


  • Lacking feature updates 
  • Emphasis on keyword density
  • No document management
  • Very expensive


Marketmuse is one of the most expensive tools in the market that starts at $149 and can quickly reach up to the $1,000s.

6. Yoast

Yoast is an SEO writing checker that integrates with WordPress using a plugin. As you pass its prompts, the content is ready for publishing, and you can have a final check to ensure the content meets the SEO best practices in real time. 

While Yoast is a good tool, it’s limited to WordPress in most cases. Most SEOs have this or RankMath as a preferred choice of SEO WordPress plugins for final checks.

Yoast is good for final checks, but only if you use WordPress.
Screenshot of the Yoast prompts.


  • Great for beginners.
  • Easy-to-understand real-time scoring
  • Helpful in union with most tools above


  • Limited to WordPress 
  • Not thorough enough


Yoast is only $99 per year but isn’t a complete on-page optimization tool. It has some website optimization features that make the pricing a bang for your buck.

When comparing Outranking, Frase, Yoast, and other Outranking competitors, it’s clear that Outranking is the most advanced tool available. Take a look at some more Outranking features that make it stand out from the crowd.

Why Outranking Outranks Other Tools

Most Comprehensive 

Outranking is the most comprehensive SEO writing checker that provides the greatest support for content success. While most tools are heavily keyword density-based, Outranking uses topic coverage and other on-page factors to score content.

AI Capabilities 

Outranking integrates with OpenAI and uses its custom trained models to generate SEO outlines, titles, and extract entities. Outranking also uses Google’s BERT for NLP extraction. This data and AI combination makes Outranking the tool for checking SEO writing.

Ease of Use 

Outranking started with an advanced SEO writing tool and hence was complicated in the beginning. Our reimagined workflow is intuitive and easy to use right out of the gate. The trial starts at $7 for the first month.

SEO Document Management 

Because Outranking is a SEO content checking, auditing, writing, and strategy platform, it’s equipped with a complete document and workflow management system with a seamless Google Doc integration.

Semantic Term Suggestions 

Outranking is the only tool that can gather semantic terms from competing web pages, determine if they would be beneficial to your web page, and provide thoughtful suggestions to incorporate them for more organic reach.


Outranking visually represents gaps in your content and helps address them quickly. Using a term map, you can also see what content you can add to elevate your success.

Depth of Data 

Outranking analyzes SERPs for many factors such as content, HTML, backlinks, page authority, score, etc. to give a complete picture of how your content measures against your competition.

Advanced Features 

Outranking is also equipped with Google Doc integration, WordPress plugin, and domain analytics from Google search console.

Why Use an SEO Writing Checker or Website Content Analysis Tool? 

Check for Errors in Your Content

Using an SEO writing checker or content analysis tool can help you identify errors in your work so you can fix them before publishing. This can help improve your chances of ranking well in search engines and avoid potential penalties. 

Ensure Your Content Is Easy to Understand

Having easy-to-understand content is a huge factor for your readers’ satisfaction. Clear and logical content is key to ensuring users keep coming back to your website. Good readability is also important for search engines, as they’ll be able to index your content more easily if it’s well-written.

Improve Your Website’s Search Engine Ranking 

If you want your website to rank well in search engine results pages (SERPs), you need to make sure that your content is high quality and keyword-rich. However, writing quality content can be a challenge, especially if you’re not a natural writer.

SEO writing checkers or content analysis tools can come in handy. These tools can help you improve your content quality and ensure it’s optimized for your target keywords. In turn, this can help to improve your website’s search engine ranking.

Create Better Content in Less Time 

SEO writing checkers or content analysis tools can help reduce the amount of time needed to edit content, improve the quality of your writing, and ensure your content is keyword-rich and optimized for search engines.

Make Your Content Perform Predictably 

If you’re serious about your website’s SEO and want to ensure your content is effective, you should consider using Outranking SEO writing checker or content analysis tool.

These tools can help you predict how well your content will perform in Google search results, and can also help you identify any potential problems that could impact your website’s ranking and help you fix them.

How to Use Outranking’s On-Page Optimization or SEO Writing Checker Tool

Outranking on-page optimization or SEO writing checker tool helps you improve your website’s ranking in search engine results pages (SERPs). The tool analyzes your web page’s content and provides recommendations on how to improve your page’s SEO. Outranking also allows you to compare your page’s SEO with that of your competitors.

Watch this video to see how you can properly optimize your content for ranking using the Outranking SEO writing checker tool.

Not All Optimization Bots Are Created Equal — So What Should You Avoid When Searching for a Checker? 

Here are a few common pitfalls to avoid when choosing the best SEO writing checker for your needs:

  1. Check that your tool assesses all the SEO elements you’re interested in
  2. Ensure your writing checker is easy to use and understand. The last thing you want is to waste time trying to figure out how to use a complicated bot.

By avoiding these common pitfalls, you’ll be able to choose the best SEO writing checker for your needs. Take a look at some more examples of things you should always keep in mind when choosing your tool.

Be Wary of Free Tools

Most free writing checkers are inaccurate, so they give you false results. This means it’d be impossible to accurately predict how well your content will rank. In the end, you may end up in losses from your unsuccessful content marketing campaign. If you’re serious about improving your writing, it’s worth investing in a paid tool.

Check for Plagiarism

One of the most common pitfalls is choosing a checker that doesn’t check for plagiarism. If it doesn’t, you may end up with a lot of duplicate content on your website, which harms your rankings. A built-in plagiarism checker also saves you the time and money needed to find and use a third-party checker. 

Consider the User Interface

When choosing an SEO writing checker, it’s important to consider the user interface. Some checkers can be difficult to use and navigate, which can make the process of checking your writing more time-consuming and frustrating.

Additionally, some checkers may not provide clear explanations of why a certain error was flagged, which can make it difficult to learn from your mistakes. To avoid these pitfalls, take some time to try out different writing checkers and find one that is easy and intuitive to use.

Outranking has an easy-to-follow SEO workflow that lets you create an SEO-optimized article in a few minutes without hassle, just by clicking “Next”. It’s very user-friendly with tooltips to guide you through the whole process.