Ahrefs vs Semrush vs Screaming Frog for Site Audits

Ahrefs and Semrush are cloud audit tools inside broader search platforms. Screaming Frog is a desktop crawler with deeper local configuration and extraction. Choose between them by the audit evidence and operating model you need, then test the same representative URL set in each finalist.

Comparison Criteria

Define required scope, rendering, URL sources, exports, history, scheduling, team access and integrations before comparing plans. Do not compare vendor issue counts or health scores as if they used the same rules.

Feature Table

Decision	Ahrefs Site Audit	Semrush Site Audit	Screaming Frog SEO Spider
Deployment	Cloud project	Cloud project	Windows, macOS or Linux desktop app
Best-fit workflow	Stored crawl alongside Ahrefs search data	Stored crawl inside a Semrush project	Analyst-led crawl, custom extraction and local exports
JavaScript	Documented; configure when needed	Available under applicable access and settings	Paid-version feature
Raw evidence	Page and Link Explorer plus exports	Issue and crawled-page reports plus exports	Detailed tabs and bulk exports
Repeat runs	Stored crawl history	Crawl comparison	Scheduling and crawl comparison in paid version
Free access	Ahrefs Free for verified sites, within allowance	Limited access; verify current entitlement	500 URLs per crawl
Main constraint to test	Credits, project access and wider subscription fit	Page, project and rendering allowances	Machine resources, local operation and licence features

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Pricing Comparison

Screaming Frog listed a paid licence at £199 per year on 11 September 2026 and a 500-URL free crawl. Ahrefs Free listed 5,000 crawl credits per verified project per month. Semrush described limited Site Audit access and plan-dependent features. These terms can change; compare the Ahrefs, Semrush and Screaming Frog official pages on the purchase date.

Calculate total cost from pages × crawl frequency, plus projects, users, rendering, API needs and analyst time. Cloud credits and desktop machine capacity are different constraints.

For Small Sites

Start with Screaming Frog's free crawl when the site stays within 500 URLs and you need a local inventory. Use Ahrefs Free when you can verify ownership and want a recurring cloud crawl. Pair either with Google Search Console for Google's own search and indexing data.

For Agencies

Test client separation, seats, reusable settings, exports, report branding and scheduled delivery. Ahrefs or Semrush may reduce tool switching when the agency already uses that platform. Screaming Frog can provide highly configurable crawl evidence for an independently produced report. See the agency selection workflow.

For Enterprise Sites

Proof-test segmentation, authentication, rendered pages, crawl safeguards, data retention, APIs and role controls on a representative section. Enterprise requirements may also justify evaluating platforms such as Lumar; vendor category alone does not establish fit.

Make the Choice

Crawl the same controlled URL set with comparable settings.
Find a known broken link, canonical condition and JavaScript-dependent element.
Export the affected URLs and hand one finding to an implementer.
Repeat after a known change and compare how each product shows it.
Choose the workflow with sufficient evidence and the lowest sustainable total cost.

Read the detailed guides for Ahrefs, Semrush and Screaming Frog. Product facts checked against official documentation on 11 September 2026.