Google Search Console is the best free starting point for on-page SEO.
A practical toolkit has five core tools:
- Google Search Console for Google Search performance data
- Screaming Frog SEO Spider for technical and on-page audits
- Semrush On Page SEO Checker for page-level recommendations
- Google PageSpeed Insights for Core Web Vitals and performance
- Google Rich Results Test for structured data validation
If you want one paid platform, Semrush is the best all-in-one option for most marketers. It combines page recommendations, competitor comparisons, semantic terms, technical suggestions and content workflows. Technical SEOs may prefer Screaming Frog, while content teams may get more value from Clearscope or Semrush SEO Writing Assistant.
Best On-Page SEO Tools at a Glance
| Tool | Best for | Price position | Main limitation |
|---|---|---|---|
| Google Search Console | Measuring Google Search performance | Free | Limited competitor and content research |
| Semrush On Page SEO Checker | Prioritized page recommendations | Paid | Some recommendations rely on competitor patterns |
| Screaming Frog SEO Spider | Technical audits and site-wide page checks | Free up to 500 URLs, paid beyond that | Desktop software requires more technical knowledge |
| Google PageSpeed Insights | Performance and Core Web Vitals | Free | Does not provide a complete SEO audit |
| Google Rich Results Test | Testing structured data | Free | Covers only supported rich result types |
| Ahrefs Site Audit | Large-scale technical and on-page auditing | Paid, with free options | Full workflows require an Ahrefs subscription |
| Clearscope | Editorial content optimization | Paid | Focuses more on content than technical SEO |
1. Google Search Console Is the Best Free On-Page SEO Tool
Google Search Console is the best starting point because it shows how your pages perform in Google Search.
The Performance report includes impressions, clicks, click-through rate and average position by query and page. Search Console also helps you find indexing problems, sitemap issues and Core Web Vitals problems.
Use Google Search Console to:
- Find pages that receive impressions but few clicks
- Identify queries where a page ranks below its potential
- Find unexpected queries for which a page already ranks
- Check whether important URLs are indexed
- Review Core Web Vitals and mobile performance
- Submit and monitor XML sitemaps
- Inspect individual URLs before and after changes
Search Console is the main source for your own Google Search data. Third-party platforms estimate rankings and traffic. Search Console reports data from Google Search for your verified property.
Best for: every website, including small businesses and beginners.
2. Semrush On Page SEO Checker Is the Best All-in-One Paid Option
Semrush On Page SEO Checker is a strong choice when you need a prioritized list of improvements for multiple landing pages.
The tool compares your pages with the top 10 Google results for target keywords. It provides recommendations for content, topic coverage, technical SEO, user experience, backlinks and SERP features. It can also connect with Google Search Console, Google Analytics and Semrush Site Audit data.
Semrush can help you find:
- Missing or underused topic terms
- Content structure changes
- Pages that may need a different target keyword
- Internal linking opportunities
- Technical issues affecting landing pages
- SERP feature opportunities
- Page-two rankings that may improve after an update
The tool also helps set priorities for large websites by considering potential traffic, the number of recommendations and implementation difficulty.
Its main limitation is that competitor-based recommendations are not ranking requirements. A top-ranking competitor may use a certain word count, heading structure or phrase without that element being necessary for your page.
Best for: marketers, agencies and in-house teams managing multiple pages.
3. Screaming Frog SEO Spider Is the Best Technical On-Page Crawler
Screaming Frog SEO Spider is the strongest option for checking page-level SEO elements across an entire website.
The crawler checks:
- Title tags
- Meta descriptions
- Headings
- Indexability
- Canonicals
- Redirects
- Duplicate content
- Structured data
- Internal links
- Images
- Response codes
It can also render JavaScript and connect with Google Analytics, Google Search Console and PageSpeed Insights.
Use Screaming Frog to find:
- Missing, duplicate or overly long title tags
- Missing or duplicated meta descriptions
- Missing or multiple H1 headings
- Orphaned or poorly linked pages
- Broken internal links
- Redirect chains and loops
- Canonical and noindex conflicts
- Duplicate or near-duplicate pages
- Indexable pages blocked by technical directives
- Structured data errors
- Image problems and oversized files
The free version crawls up to 500 URLs. A paid licence removes that limit and adds scheduling, crawl comparison, JavaScript rendering and custom extraction.
Best for: technical SEO audits, agencies, developers and websites with more than a few hundred URLs.
4. Google PageSpeed Insights Is the Best Tool for Page Performance
Google PageSpeed Insights is the best free tool for checking page speed and real-user experience.
PageSpeed Insights combines field data from real Chrome users through the Chrome User Experience Report with lab data generated by Lighthouse in a controlled test environment.
It reports metrics such as Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift. It also provides diagnostic recommendations.
Google's recommended Core Web Vitals targets are:
- LCP: 2.5 seconds or less
- INP: less than 200 milliseconds
- CLS: less than 0.1
These metrics measure loading performance, responsiveness and visual stability.
Do not treat the overall PageSpeed score as a ranking score. Use the report to investigate specific issues such as slow server response, render-blocking resources, oversized images and excessive JavaScript.
Best for: developers, publishers and site owners investigating slow pages.
5. Google Rich Results Test Is the Best Structured Data Validator
Google Rich Results Test is the quickest way to check whether a page's structured data is eligible for supported rich results.
The tool tests a public URL or code sample. It identifies supported structured data items, validation errors and eligibility details.
It can validate markup for:
- Product
- Article
- Breadcrumb
- Recipe
- Event
- Local business
- Review snippet
- Software application
Structured data helps Google understand the meaning and properties of page content. It can make a page eligible for richer search appearances, but valid structured data does not guarantee that Google will display a rich result.
Best for: ecommerce websites, publishers, local businesses and developers implementing Schema.org markup.
6. Ahrefs Site Audit Is a Strong Alternative for Large Websites
Ahrefs Site Audit is a good alternative to Screaming Frog when you want browser-based, recurring website audits.
Ahrefs says Site Audit checks more than 170 technical and on-page issues, including titles, meta descriptions, H1 tags, duplicate content, indexability, internal links, redirects, images, JavaScript, structured data and Core Web Vitals.
It also provides:
- Scheduled crawls
- JavaScript rendering
- Issue prioritization
- Internal linking suggestions
- Page and link explorers
- Crawl history and visual reports
- Exportable issue lists
Ahrefs is often easier for non-technical teams because it presents audit findings in a web interface with categorized errors and recommendations. Screaming Frog gives you more control over crawl settings, extraction and raw crawl data.
Best for: SEO teams that want scheduled audits, historical reporting and Ahrefs competitor research.
7. Clearscope Is Best for Content-Focused Teams
Clearscope is a strong choice for editorial teams that need guidance while writing and updating content.
Clearscope analyzes topic coverage and provides content recommendations, content scoring and integrations with Google Docs, Microsoft Word and WordPress.
It can help writers:
- Build a content brief
- Identify relevant subtopics
- Improve topic coverage
- Review readability
- Apply a consistent process across multiple writers
- Update older content more systematically
Clearscope does not replace Search Console, a crawler or PageSpeed Insights. Its main role is content optimization.
Best for: publishers, content agencies and teams producing multiple search-focused articles.
Which On-Page SEO Tools Should You Use?
For a Small Business Website
Use:
- Google Search Console
- PageSpeed Insights
- Google Rich Results Test
- Screaming Frog's free version
This combination covers Search performance, page speed, structured data and basic technical issues without requiring a paid SEO platform.
For a Content Marketing Team
Use:
- Google Search Console
- Semrush On Page SEO Checker
- Semrush SEO Writing Assistant or Clearscope
- PageSpeed Insights
Semrush SEO Writing Assistant evaluates SEO, readability, originality and tone of voice while you write. It can generate recommendations from target keywords and selected search results.
For an Ecommerce Website
Use:
- Google Search Console
- Screaming Frog or Ahrefs Site Audit
- Google Rich Results Test
- PageSpeed Insights
- Semrush or Ahrefs for keyword and competitor research
Product pages need careful checks for indexability, canonical URLs, internal links, product structured data, images, page speed and duplicate variants.
For a Technical SEO Agency
Use:
- Screaming Frog SEO Spider
- Google Search Console
- PageSpeed Insights
- Google Rich Results Test
- Ahrefs Site Audit or Semrush Site Audit
Screaming Frog is the better fit when you need crawl customization, raw HTML analysis, JavaScript rendering, custom extraction or detailed crawl comparisons.
The Most Effective On-Page SEO Workflow
A practical workflow looks like this:
- Start with Google Search Console. Find pages with impressions, low click-through rates or declining performance.
- Crawl the website. Use Screaming Frog or Ahrefs Site Audit to find indexability, metadata, heading, link and duplicate-content problems.
- Review priority pages in Semrush On Page SEO Checker. Compare them with current search competitors, but treat the recommendations as guidance rather than requirements.
- Improve the page for the searcher. Give the correct answer, add useful structure and examples, and link clearly to related pages.
- Check performance in PageSpeed Insights. Investigate the specific causes of slow loading or poor interaction.
- Validate structured data in Google Rich Results Test.
- Monitor the updated URL in Search Console. Use Search Console data to judge performance instead of relying only on third-party scores.
What These Tools Cannot Tell You
No on-page SEO tool can guarantee rankings. Optimization scores are diagnostic aids, not Google ranking grades.
Avoid blindly following recommendations for:
- Exact keyword density
- Arbitrary word counts
- Terms that make the writing unnatural
- Competitor heading structures
- Content created only to satisfy a tool score
Google says it does not use a preferred word count. It recommends creating helpful, reliable, people-first content rather than content designed mainly to manipulate rankings.
Final Recommendation
For most websites, begin with Google Search Console, Screaming Frog and PageSpeed Insights. Add Google Rich Results Test when structured data matters.
Choose Semrush if you want one paid platform for page recommendations, competitor comparisons and content workflows. Choose Ahrefs Site Audit for scheduled technical monitoring and broader Ahrefs research. Choose Clearscope when the main need is producing and maintaining search-focused content.