How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- Ahrefs Site Audit is the best all-round checker, with free Webmaster Tools for verified sites and Starter at $29 a month.
- Screaming Frog is the deepest desktop crawler, free up to 500 URLs and about $259 a year for unlimited crawling.
- SE Ranking suits agencies that need audit, scheduling, and API access on one plan, from $55 to $129 a month by guides.
- Google Search Console is free and is the ground truth for indexing, but it is data, not a report.
- Pair a hosted checker with a desktop crawler: hosted tools schedule and explain, desktop tools find everything.
Quick comparison
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Starting priceFree
Free planYes
Ahrefs Site Audit suits teams that want a scheduled cloud crawl inside a full SEO suite. The free Webmaster Tools tier covers verified sites with site audits and basic backlink data, which is a genuine free entry point, while Starter costs $29 a month with usage caps and deeper features on higher tiers.
Crawl depth is excellent, with JavaScript rendering and link intelligence behind every audit. Credit allowances matter on heavy crawling, so check your plan limits before running large audits. In 2026 Ahrefs also added brand and AI search tracking, which widens the audit beyond classic rankings.
What we like- Free Webmaster Tools for verified sites
- Deep crawl with JavaScript rendering
- Backlink data in suite
Watch out for- Full suite pricing climbs fast past Starter
- Credit-based limits on heavy crawling
- Needs technical skill for full value
Starting priceFrom $139 per month
Free planFree trial
Semrush Site Audit suits marketing teams already on Semrush, with 140+ checks covering crawlability, HTTPS, internal linking, and performance, plus scheduled cloud crawls and thematic reports. Entry pricing runs about $139 a month, with a 7-day free trial, and guides list a 100,000-page monthly cap.
The suite breadth is the point: audit findings link to keyword, content, and competitor data in the same product. For a team that only needs audits, the price is steep. For a team running SEO, content, and PPC together, Semrush is the most complete suite here.
What we like- 140+ checks in one audit
- Scheduled cloud crawls
- Thematic reports for teams
Watch out for- About $139 a month entry
- 100,000 pages a month cap by guides
- API tiered by plan
Starting priceFrom $55 per month
Free planFree trial
SE Ranking Website Audit suits agencies and freelancers that live on client reports, with audit, scheduling, and API access on one plan rather than gated behind enterprise tiers. Guides list entry from $55 to $129 a month depending on tier and billing, with a 14-day free trial, and Growth crawls up to 2 million pages.
The interface is clean and the reporting is agency-ready, which is why SE Ranking is often called the best value all-in-one for agencies. For very large enterprise sites, dedicated crawlers may still win on depth, but for most agencies SE Ranking covers the audit job.
What we like- Audit, schedule, and API on one plan
- Up to 2 million pages on Growth
- Clean agency reporting
Watch out for- Guides list $55 to $129 a month entry
- Less suited for large enterprise sites
- Crawl caps by plan
Starting priceFree
Free planYes
Screaming Frog SEO Spider is the crawler every technical SEO runs. It finds everything: status codes, redirects, canonicals, titles, headings, links, images, schema, and JavaScript rendering, and exports it to a spreadsheet. The free version covers up to 500 URLs, while the paid license costs about $259 a year, or 199 pounds, for unlimited crawling.
It does not explain what to do, and turning output into a client report takes work. It is also RAM-bound, since it runs on your computer rather than in the cloud. For a technical SEO, it is essential. For a business owner, pair it with a hosted tool that explains findings.
What we like- Deepest desktop crawler available
- Free up to 500 URLs
- About $259 a year for unlimited
Watch out for- Runs on your computer, RAM-bound for large sites
- No hosted reports
- Steep learning curve
#5Sitebulb
Best for: Readable client audits4.5/5 on
G2 (13 reviews, checked Oct 2026)
Visit sitebulb.com
Starting priceFrom $15 per month
Free planFree trial
Sitebulb suits teams that need audits the whole team can read. It prioritizes issues, explains each one in plain language, and produces visual reports that clients and bosses understand without SEO training. Entry pricing runs about $15 to $18 a month by guides, with a free trial, and Pro crawls up to 500,000 pages.
It is a desktop crawler rather than a hosted service, so scheduling and cloud API sit on higher tiers. For an in-house team that must turn audit findings into approved fixes, Sitebulb explanations save more time than any other tool here.
What we like- Excellent explanations and prioritized audits
- Visual reports for clients
- About $15 to $18 a month entry
Watch out for- Desktop crawler, not hosted
- Cloud API only on Pro
- Smaller suite than Semrush
Starting priceFree
Free planYes
Google Search Console is free and is the ground truth for indexing: it shows which pages Google indexed, which it skipped, and why, plus Core Web Vitals from Google own data. There are no crawl caps, since it reports on all indexed pages, and it costs nothing.
It is data, not a report: no competitor audits, no prioritized fix lists, and no plain-language explanations. Every site should run Search Console alongside a real checker, since it catches indexing problems that third-party crawlers can miss. As a sole checker, it leaves too much interpretation to the user.
What we like- Free for all indexed pages
- Google own indexing and Core Web Vitals data
- No crawl caps
Watch out for- Data, not reports
- No competitor audits
- No prioritized fix lists
Starting priceFree
Free planYes
Seobility suits small sites that want a hosted checker without paying for a full suite. The free tier covers up to 100 pages, and Premium costs $69.90 a month by September 2026 guides, with hosted crawls that are easy to read.
Free tier caps matter for sites over 100 pages, and crawl depth trails Screaming Frog. For a small business site that needs a simple, hosted audit on a budget, Seobility is a clean, honest pick.
What we like- Free to 100 pages
- Premium $69.90 a month by guides
- Hosted and easy to read
Watch out for- Free tier caps at 100 pages
- Smaller crawl depth than Screaming Frog
- Less suite breadth
Starting priceFrom $39 per month
Free planFree trial
Sitechecker suits in-house teams that want continuous monitoring between full audits, with alert-led reporting that flags new issues as they appear rather than waiting for a monthly crawl. Entry pricing runs about $39 a month by guides, with a free trial.
Audit caps on lower tiers are small, and depth trails the specialist crawlers. For a team that needs to catch breakage between audits, Sitechecker monitoring fills a gap that monthly tools leave open.
What we like- Continuous monitoring between audits
- Alert-led reporting
- About $39 a month entry
Watch out for- Small audit caps on lower tiers
- Less depth than Screaming Frog
- Suite breadth thinner
How we chose
We compared SEO checker tools on crawl depth, JavaScript rendering, scheduling, API access, reporting clarity, page caps, and price, using vendor pages and October 2026 audit guides. We favored tools with published pricing and real audit use, and we left out single-page tools like Lighthouse except where noted, since they do not audit a whole site.
Match the tool to the audit job. For a whole-site technical audit, Screaming Frog or Sitebulb find the most. For scheduled monitoring and client reports, SE Ranking or Ahrefs suit better. For a free start, Google Search Console plus Ahrefs Webmaster Tools covers indexing and basic audits at no cost.
Run hosted and desktop together
Most teams use one of each: a hosted checker for scheduled crawls and plain-language reports, plus a desktop crawler for deep dives. Hosted tools cap page counts by plan and present results for a non-technical reader, while desktop tools crawl without caps but need skill to interpret. Together they cover both depth and communication.
Check page caps before you pay
Page caps decide the real price. A $55 plan that caps at 10,000 pages costs more than a $129 plan with 2 million pages once your site grows. Count your URLs, including staging and parameter pages, and pick a plan with headroom for growth rather than one that fits today exactly.
Fix by impact, not by count
An audit can return thousands of issues, and most of them barely matter. Fix indexing blocks, broken pages, and duplicate canonicals first, then move to titles and internal links, and leave minor warnings for last. A report with 50 fixed high-impact issues beats a report with 500 fixed trivial ones, and it is the progress search engines actually reward.
Frequently asked questions
Which SEO checker tool is best overall?
Ahrefs Site Audit, for scheduled cloud crawls, JavaScript rendering, and a free Webmaster Tools tier for verified sites. Screaming Frog beats it on raw crawl depth, but Ahrefs is easier for teams that need reports non-technical colleagues can read.
Is there a free SEO checker tool?
Yes. Google Search Console is free for all indexed pages, Ahrefs Webmaster Tools is free for verified sites, Screaming Frog is free up to 500 URLs, and Seobility is free up to 100 pages. Together those four cover a small site audit at no cost, though paid tools add scheduling and prioritization.
What is the difference between a checker and a crawler?
A checker audits and explains issues, while a crawler finds raw data. Hosted checkers schedule and report, desktop crawlers find everything but need interpretation. Most teams use one of each, since neither type alone covers both depth and communication.
How often should I audit my site?
Monthly for most sites, weekly for large or fast-changing sites, and immediately after a redesign, migration, or major content push. Continuous monitoring tools like Sitechecker catch breakage between scheduled audits, so problems surface in days rather than at the next monthly crawl.
Do I need a paid tool if I have Search Console?
Search Console shows indexing truth from Google, but it does not prioritize fixes, audit competitors, or explain issues in plain language. A paid checker adds prioritization, reporting, and depth that Search Console alone does not provide, and that combination is what most teams actually need.
Sources we checked (8)
- https://ahrefs.com
- https://www.semrush.com
- https://seranking.com
- https://www.screamingfrog.co.uk
- https://sitebulb.com
- https://search.google.com/search-console
- https://www.seobility.net
- https://sitechecker.pro
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.
Ahrefs Site Audit
Semrush Site Audit
SE Ranking Website Audit
Screaming Frog SEO Spider
Google Search Console
Seobility
Sitechecker