SEMrush

What Semrush Does

Semrush started as a keyword research tool in 2008 and has grown into a platform with over 55 individual tools (Semrush, 2025). It serves over 10 million users, including 30% of Fortune 500 companies (Semrush Annual Report, 2024). Its core strength is the depth of its keyword database and the breadth of its marketing toolkit.

While Ahrefs specializes in backlinks and competitive analysis, Semrush goes wider. It includes PPC research, social media scheduling, content optimization, local SEO tools, and a full reporting suite. If you need one platform for everything, Semrush is the strongest candidate.

Domain Overview

Enter any domain to see a snapshot: organic traffic estimate, paid traffic, backlinks, display advertising, and top organic keywords. The Authority Score (0 to 100) measures overall domain strength based on backlinks, organic traffic, and other signals.

The competitive positioning map is unique to Semrush. It plots your domain against competitors based on total keywords and estimated organic traffic, giving you an instant visual of where you stand.

Keyword Magic Tool

The Keyword Magic Tool is Semrush's flagship keyword research feature. Enter a seed keyword and it returns a grouped list of related keywords organized by topic cluster.

Semrush's keyword database contains over 26 billion keywords across 142 countries (Semrush, 2025). Each keyword comes with:

• Volume — average monthly searches
• Keyword Difficulty (KD%) — estimated difficulty to rank in the top 10
• CPC — average cost per click in paid search
• SERP features — which special results appear (featured snippets, People Also Ask, etc.)
• Intent — classified as informational, navigational, commercial, or transactional

The intent classification is particularly valuable. Semrush automatically tags every keyword with its search intent, saving you the manual work of categorizing thousands of keywords. A study across 3.8 billion keywords found that 52% of searches have informational intent, 33% have navigational intent, and the remaining 15% split between commercial and transactional (Semrush Search Intent Study, 2024).

Position Tracking

Position Tracking monitors your keyword rankings daily. Add your target keywords and Semrush checks your position every day, tracking changes over time. It supports tracking by country, state, city, and even ZIP code level.

The Visibility Trend shows your overall search visibility as a percentage. The Cannibalization tab identifies when multiple pages on your site compete for the same keyword, which is a common problem that dilutes your ranking potential.

The Featured Snippet tracking shows when your pages win (or lose) featured snippets, which appear above position 1 and capture approximately 8.6% of all clicks when present (Ahrefs SERP Study, 2024).

Site Audit

Semrush's Site Audit crawls your website and scores it out of 100 based on technical health. It checks over 140 types of issues, including:

• Crawlability errors (broken links, redirect chains, 5xx errors)
• HTTPS implementation problems
• Core Web Vitals performance
• Internal linking issues
• Duplicate content and thin content pages
• Structured data validation

Each issue includes a "Why and how to fix it" explanation, making it approachable even for beginners. Schedule audits weekly to catch issues early. The average website has a Site Health score of 68 out of 100 (Semrush State of Search, 2024).

Backlink Analytics

Semrush's backlink database contains over 43 trillion links (Semrush, 2025). The Backlink Analytics tool shows referring domains, anchor text distribution, link types, and new or lost links over time.

The Backlink Gap tool compares your backlink profile against up to four competitors. It finds domains that link to your competitors but not to you, creating a targeted list of link building prospects.

The Toxic Score identifies potentially harmful backlinks. While Google's John Mueller has said the disavow tool is rarely needed, monitoring your toxic links helps you spot negative SEO attacks or spammy link patterns early.

Semrush vs Ahrefs: When to Use Which

Both tools are excellent. Here is how they compare for common tasks:

• Keyword research — Semrush wins with intent classification and the Keyword Magic Tool's topic grouping
• Backlink analysis — Ahrefs has a slightly larger and more frequently updated index
• Technical audit — Both are strong; Semrush has better explanations for beginners
• Content analysis — Ahrefs Content Explorer is more powerful for finding linkable content
• All-in-one breadth — Semrush covers PPC, social, local SEO, and content marketing; Ahrefs focuses on SEO
• Pricing — Both start around $129/month (2025). Semrush offers more features per dollar if you need marketing beyond SEO

If you can only afford one tool, choose based on your primary need. For pure SEO and backlinks, Ahrefs. For broader marketing plus SEO, Semrush. Over 67% of professional SEOs use at least one of these two platforms (Search Engine Journal SEO Survey, 2024).