SEMrush Tutorial: Technical SEO Auditing and Competitive Intelligence in 2025

SEMrush remains a dominant force in the SEO toolkit landscape in 2025, with features spanning site auditing, keyword research, competitive intelligence, and content optimization. For developers and technical SEO engineers, SEMrush offers a Site Audit module with configurable crawl settings, API access for automated reporting, and a suite of competitive research tools that can be integrated into data-driven SEO workflows.

The SEMrush Site Audit tool functions as a dedicated crawler that evaluates on-page SEO, site structure, and performance. To get accurate, actionable results, you must configure the crawl properly for your specific tech stack.

Start by creating a new project and entering your domain. Under "Site Audit settings," configure the following:

• Crawl source: Use "SEMrushbot" as the crawler and set the crawl speed to "Slow" for large sites to avoid overwhelming your server.
• Include/exclude rules: Use regex patterns to exclude admin paths, staging directories, and asset CDN subdomains. For example, exclude /wp-admin/* or /staging/*.
• JavaScript rendering: Enable this for client-rendered sites. SEMrush renders pages with a headless browser, allowing it to discover links and content loaded dynamically via JavaScript (SEMrush, 2025, "Site Audit: How to Improve Your Site's Technical Health").

The audit report categorizes issues by error type: Errors (critical), Warnings (moderate), and Notices (informational). Each issue includes affected URLs, a severity score, and suggested fixes. For custom issue tracking, export the report as PDF or CSV.

The On-Page SEO Checker combines technical audit data with content optimization suggestions. Enter a target keyword, and the tool compares your page against the top 10 ranking competitors. It generates a prioritized list of recommendations, including:

• Missing title tags and meta descriptions
• Internal linking opportunities
• Schema markup gaps, such as missing FAQ or Article schema
• Content length and keyword density comparisons

This tool is especially valuable for developers performing content audits because it quantifies exactly which on-page elements need attention. Each recommendation links to the specific page element, reducing the time spent locating the issue (SEMrush, 2025, "On-Page SEO Checker: Optimize Your Content for Better Rankings").

The Domain vs. Domain tool in SEMrush provides a direct competitive comparison. Enter your domain and up to four competitors. The tool generates a side-by-side analysis of:

• Organic keyword overlap
• Backlink profile comparison
• Top performing pages
• Estimated traffic distribution

For technical SEO teams, the backlink comparison is the most actionable section. It reveals which competitors have link equity advantages and highlights domains that link to competitors but not to you. Export the "New Lost Backlinks" report weekly to track churn in your link profile (SEMrush, 2025, "Competitive Research: How to Analyze Your Competitors' SEO Strategy").

SEMrush provides a REST API (Project API) that gives programmatic access to site audit results, position tracking data, and keyword analytics. The API uses OAuth 2.0 authentication and returns JSON responses. Rate limits vary by plan, typically 500 requests per minute for business tier accounts.

You can build automated workflows such as:

• Pulling weekly site audit data into a data warehouse
• Triggering alerts when critical errors exceed a threshold
• Populating a custom SEO dashboard in tools like Grafana or Metabase

SEMrush's Site Audit, On-Page SEO Checker, and Domain vs. Domain analysis form a complete technical audit cycle. Configure the crawl to match your stack, review recommendations from the On-Page Checker weekly, and run competitive analysis monthly. Use the API to push findings into your existing monitoring infrastructure. Regular SEMrush audits help maintain alignment between technical health and organic search performance.

SEMrush. (2025). "Site Audit: How to Improve Your Site's Technical Health." SEMrush Blog. https://www.semrush.com/blog/site-audit/

SEMrush. (2025). "On-Page SEO Checker: Optimize Your Content for Better Rankings." SEMrush Blog. https://www.semrush.com/blog/on-page-seo-checker/

SEMrush. (2025). "Competitive Research: How to Analyze Your Competitors' SEO Strategy." SEMrush Blog. https://www.semrush.com/blog/competitive-research/