There is no shortage of SEO audit tools. There are free ones, cheap ones, expensive ones, and everything in between, all claiming to give you a complete picture of your website’s SEO health.
The problem is not finding a tool. The problem is knowing which ones are actually worth using, what each one is genuinely good at, and what none of them can do regardless of how much you pay.
This article covers every tool worth knowing about, from completely free to enterprise-level, with an honest assessment of what each one does well, where it falls short, and who it is actually for. No affiliate angles. No ranking one tool above another because of a commission. Just a straightforward comparison so you can make a useful decision.
Before Comparing Tools, What You Actually Need
SEO audit tools fall into a few distinct categories. Understanding which category solves your problem saves you from paying for features you will never use or choosing a tool that does not cover what you actually need.
Technical crawlers examine your website the way Google does, finding broken links, missing tags, redirect issues, duplicate content, and everything else that affects how Google accesses your site. Screaming Frog is the dominant tool in this category.
All-in-one platforms combine technical crawling with keyword research, backlink analysis, rank tracking, and competitor research in a single subscription. Ahrefs and Semrush are the two main players.
Search Console and Analytics are Google’s own tools, free, authoritative, and irreplaceable regardless of what else you use. No third-party tool tells you more accurately how Google actually sees your site than Google’s own data.
Backlink analysis tools focus specifically on examining link profiles, yours and your competitors’. Ahrefs is the best in this category but Semrush and Moz also cover it.
Page speed and experience tools measure how your site performs for users and against Google’s Core Web Vitals benchmarks. Google PageSpeed Insights and Web.dev are the primary tools here.
Most businesses doing their own SEO audit need two to three tools from across these categories, not one tool that claims to do everything.
Google Search Console
Cost: Free
Best for: Understanding how Google actually sees your site
Search Console is not optional. It is the baseline every other tool builds on. Nothing tells you more authoritatively how Google is crawling, indexing, and ranking your site than Google’s own data, and Search Console gives you direct access to that data for free.
What it covers well: which searches your pages are appearing for and how many clicks they generate, which pages are indexed and which are not, crawl errors and coverage issues, Core Web Vitals performance, manual actions and security issues, and sitemap status.
What it does not cover: competitor data, backlink analysis beyond a basic link report, keyword research, and in-depth technical crawl data. Search Console tells you what Google has found on your site, it does not crawl your site proactively the way Screaming Frog does.
Who should use it: Everyone. Every website owner regardless of technical skill level or budget. There is no legitimate reason not to have Search Console set up. If you have not done this yet, do it before reading the rest of this article.
Google PageSpeed Insights
Cost: Free
Best for: Diagnosing speed and Core Web Vitals issues
PageSpeed Insights measures your page load speed and Core Web Vitals scores for both mobile and desktop and tells you specifically what is causing any performance issues. It is built on Lighthouse, Google’s open-source performance audit tool, and it uses real-world user data from the Chrome User Experience Report alongside the lab-based Lighthouse scores.
The output is specific and actionable in a way most tools are not. It does not just tell you your score, it tells you which specific elements are causing your Largest Contentful Paint to be slow, which scripts are blocking rendering, and exactly how much each issue is contributing to your overall score.
What it does not cover: anything beyond page speed and Core Web Vitals. No keyword data, no backlinks, no crawl analysis.
Who should use it: Every business as part of their standard audit. Run your homepage and your most important service pages through it. Address the highest-impact issues flagged before worrying about anything else speed-related.
Screaming Frog SEO Spider
Cost: Free up to 500 URLs / £259 per year for unlimited
Best for: Deep technical site crawls
Screaming Frog is what professional SEO auditors use to crawl websites. It works the same way Google’s crawler does, visiting every page on your site and returning a comprehensive dataset of everything it finds. Title tags, meta descriptions, headings, response codes, canonical tags, internal links, images, hreflang, structured data, page depth, redirect chains – all of it, exported to a spreadsheet you can filter and analyze.
For a thorough technical audit Screaming Frog is the standard tool. Nothing else gives you the same depth of on-site technical data at this price point.
The free version covers up to 500 URLs, which is enough for most small business websites. If your site has more than 500 pages the paid version at £259 per year is still the most cost-effective technical crawl tool available.
The limitation is that Screaming Frog requires some technical knowledge to interpret. It produces a large amount of data and knowing which columns to look at, which flags are significant, and which are minor requires either experience or a willingness to learn. For a business owner running their own audit it has a steeper learning curve than the other tools on this list — but the depth of data it provides justifies that curve for anyone serious about technical SEO.
Who should use it: Business owners willing to invest a few hours learning the tool, SEO professionals, and anyone doing a thorough technical audit of a site with more than 20 to 30 pages.
Ahrefs
Cost: From $129/month (Lite) to $449/month (Advanced)
Best for: Backlink analysis and keyword research
Ahrefs has the largest and most frequently updated backlink index of any tool on the market. If you want to understand your backlink profile, who is linking to you, the authority of those links, which links are toxic, how your profile compares to competitors, and where your competitors are getting links that you are not, Ahrefs is the best tool for it.
Beyond backlinks, Ahrefs is also strong for keyword research, content gap analysis, rank tracking, and site auditing. Its Site Audit feature crawls your website and flags technical issues in a way that is more visual and accessible than Screaming Frog’s raw spreadsheet output, though less granular in its technical depth.
The pricing puts it out of reach for many small business owners as a primary tool, $129 per month is a meaningful ongoing cost for a business that only needs to run occasional audits. The use case that justifies the Lite plan is a business or agency running ongoing SEO work across multiple sites where keyword research, competitor analysis, and backlink tracking are regular activities rather than one-time exercises.
Ahrefs Webmaster Tools (free with site verification) gives you access to the backlink data for your own site, a genuinely useful free tier that is worth setting up regardless of whether you pay for a full subscription.
Who should use it: Agencies, in-house SEO teams, and serious businesses running ongoing SEO campaigns where the backlink and keyword research capabilities justify the monthly cost. For occasional audits, the free Webmaster Tools tier is enough.
Semrush
Cost: From $140/month (Pro) to $500/month (Business)
Best for: All-in-one SEO platform with strong competitor research
Semrush competes directly with Ahrefs as an all-in-one SEO platform and the comparison between them is genuinely close. Semrush is stronger in a few specific areas, its competitor traffic analysis, its advertising research features, and its content marketing tools are generally considered better than Ahrefs equivalents. Ahrefs has a larger and more accurate backlink index and is generally considered the stronger tool for pure link analysis.
For SEO auditing specifically, Semrush’s Site Audit tool is well-designed and accessible. It crawls your site, categorizes issues by severity (errors, warnings, notices), and provides a clear dashboard showing your overall site health score and the specific issues dragging it down. For a business owner doing their own audit the visual presentation is more approachable than Screaming Frog’s raw output.
The pricing mirrors Ahrefs, meaningful for small businesses doing occasional audits, justifiable for agencies and businesses with active ongoing SEO programs.
Semrush Free Account gives limited access to some features including a restricted version of the Site Audit tool. Enough to get a basic picture, not enough for a thorough audit.
Who should use it: The same profile as Ahrefs, agencies and businesses with ongoing SEO needs. If you are choosing between Ahrefs and Semrush for an agency context, the decision often comes down to whether you prioritize backlink analysis (Ahrefs) or all-in-one breadth including competitor traffic data (Semrush).
Moz Pro
Cost: From $99/month (Starter) to $599/month (Premium)
Best for: Domain Authority tracking and accessible reporting
Moz invented the concept of Domain Authority, the 1 to 100 score that estimates how much ranking power a website has accumulated. DA has become an industry-standard shorthand metric even among users of other tools, partly because Moz was there first and partly because the metric is genuinely useful as a comparative benchmark.
Moz Pro’s audit capabilities are solid though not as deep as Ahrefs or Semrush. Its keyword research and rank tracking features are competent. Where Moz genuinely differentiates is in the accessibility of its interface and reporting, it is the most beginner-friendly of the paid all-in-one platforms, which makes it a reasonable choice for a business owner managing their own SEO without a technical background.
The MozBar browser extension (free) is a useful lightweight tool that displays DA and basic on-page SEO data for any page you visit, worth installing regardless of whether you use Moz Pro.
Who should use it: Businesses that find Ahrefs and Semrush overwhelming and want a more approachable platform. Not the strongest choice for agencies or advanced users where the depth of Ahrefs or Semrush is available at a comparable price.
Ubersuggest
Cost: Free (limited) / $29/month (Individual) / One-time payment options available
Best for: Budget-conscious users who need basic keyword and audit data
Ubersuggest was acquired and rebuilt by Neil Patel and positioned as a more affordable alternative to Ahrefs and Semrush. It covers keyword research, site auditing, backlink analysis, and rank tracking at a significantly lower price point.
The honest assessment is that the data quality and depth in Ubersuggest is meaningfully lower than Ahrefs or Semrush. The backlink index is smaller. The keyword data is less comprehensive. The site audit flags issues but with less granularity than more established tools.
For a small business owner with a limited budget who needs basic audit and keyword data and cannot justify $129/month for Ahrefs, Ubersuggest is a reasonable starting point. It will surface the most significant issues. It will not go as deep as the premium tools.
Who should use it: Budget-constrained small businesses doing basic self-audits. Not for agencies or businesses where data depth and accuracy are priorities.
Web.dev and Lighthouse
Cost: Free
Best for: Core Web Vitals deep dives and developer-level performance analysis
Web.dev is Google’s developer-focused platform built on Lighthouse, the same engine behind PageSpeed Insights. For most business owners PageSpeed Insights is enough. Web.dev and running Lighthouse directly in Chrome DevTools gives developers and technically-minded users more granular performance data and diagnostic detail.
The audit covers performance, accessibility, best practices, and SEO – surfacing issues across all four categories in a single report. The SEO category covers basic on-page elements like title tags, meta descriptions, crawlability, and mobile-friendliness but not competitive data or backlinks.
Who should use it: Developers and technically-minded users who need more performance diagnostic depth than PageSpeed Insights provides. Not necessary for most small business self-audits.
Sitebulb
Cost: From $13.50/month to $55/month
Best for: Visual technical audits with clear prioritization
Sitebulb sits between Screaming Frog and the all-in-one platforms in the technical audit space. It crawls your site like Screaming Frog but presents findings in a more visual, prioritized format that is significantly more accessible for non-technical users. Issues are presented with clear severity ratings, visual diagrams showing site architecture, and explanations of why each issue matters.
For a business owner who needs the depth of a technical crawl but finds Screaming Frog’s spreadsheet output difficult to navigate, Sitebulb is the most accessible technical audit tool available. The monthly cost is reasonable and lower than the all-in-one platforms.
Who should use it: Business owners doing serious self-audits who find Screaming Frog too raw and want technical depth without the spreadsheet. Agencies that prioritize clear visual reporting for client deliverables.
The Honest Tool Stack for Most Small Businesses
You do not need to pay for everything. Here is what actually makes sense at different levels:
If your budget is zero:
- Google Search Console – non-negotiable, free
- Google PageSpeed Insights – non-negotiable, free
- Screaming Frog free version (up to 500 URLs) – covers basic technical crawl
- Ahrefs Webmaster Tools free tier – covers your backlink profile
- MozBar browser extension – DA checks and on-page quick reads
This free stack covers the majority of what a basic small business audit needs. The gaps are competitive data and keyword research, you are auditing your own site in relative isolation rather than benchmarking against competitors.
If your budget is $30 to $50/month:
- Everything above plus Ubersuggest or a Sitebulb subscription
- Adds keyword research, basic competitor data, and more accessible technical reporting
If your budget is $100 to $150/month:
- Google Search Console and PageSpeed Insights (free)
- Ahrefs Lite or Semrush Pro
- This gives you the full picture – technical audit, keyword research, backlink analysis, competitor research, and rank tracking in a single platform
If you are an agency or running SEO across multiple sites:
- Screaming Frog paid (unlimited crawls)
- Ahrefs or Semrush at a higher tier
- Google Search Console and PageSpeed Insights
- This is the professional stack, covers everything a client-facing audit needs
What No Tool Can Do
Every tool on this list surfaces data. None of them interpret it.
A Screaming Frog crawl will tell you that 47 pages have duplicate meta descriptions. It will not tell you which 47 pages matter, whether fixing them will move your rankings, or what to write instead. Ahrefs will tell you your domain authority is 14 and your competitor’s is 38. It will not tell you how to close that gap, which links to pursue first, or how long it will realistically take.
The tools are inputs. The judgment about what to prioritize, what matters in your specific competitive context, and what to actually do about each finding, that is the part that requires either experience or a professional.
If you want a human to interpret what the tools are showing you about your site and tell you exactly what to fix first, Ranqeo’s SEO audit service starts with a free review before we recommend anything further.
Get your free SEO audit from Ranqeo
Frequently Asked Questions
Is Google Search Console enough for a full SEO audit?
No — but it is the most important single tool and the non-negotiable starting point. Search Console tells you how Google sees your site but does not crawl proactively, provide competitor data, or give you the depth of technical analysis that Screaming Frog or the all-in-one platforms do. Use it alongside other tools, not instead of them.
Ahrefs or Semrush – which is better?
For backlink analysis Ahrefs has the stronger index and is generally considered the more accurate tool. For all-in-one breadth including competitor traffic analysis and content tools Semrush has the edge. Most agencies pick one and stick with it — the difference in practice is less significant than the debate around them suggests. Both are excellent tools at comparable price points.
Do free SEO tools give accurate data?
For the most part yes, with caveats. Google Search Console and PageSpeed Insights give completely accurate data because they come directly from Google. The free tiers of third-party tools like Ahrefs Webmaster Tools and the MozBar give accurate but limited data. Free standalone tools with no paid tier tend to use smaller, less frequently updated data sets — the data is directionally useful but not as precise as premium tool data.
How often should I run an SEO audit?
A full comprehensive audit makes sense once when starting SEO work, then annually. Lighter monthly checks, reviewing Search Console for new errors, checking Core Web Vitals, monitoring rank movement, should be ongoing. If you experience a significant unexplained traffic drop, run a full audit immediately regardless of timing.
Can I use multiple tools at the same time?
Yes and most serious SEO practitioners do. The tools complement each other, Search Console for Google’s direct data, Screaming Frog for deep technical crawls, Ahrefs for backlink and keyword data. Using one tool for everything means accepting the gaps in that tool’s coverage. Using two or three tools that each do something specific well gives you a more complete picture.