The best SEO audit software of 2026

SERPed.net treats an audit as a sales tool as much as a repair list. Its SEO Audit checks any page for on-page and off-page SEO, mobile friendliness, speed and security. You can run a quick one-off report for a prospect, or set up an automated report that runs on a schedule and graphs a client's progress over time. Each site you add to Site Manager also gets an audit with fixes and up to three competitors to compare against, and Site Crawler maps a site's internal links to find dead links and HTTP errors.

Site Auditor Pro is the part agencies buy it for. You put an audit form on your own site, or add it with the WordPress plugin. A visitor enters their site and details, gets a report under your brand, and their contact goes to you or straight into an email tool such as AWeber, Mailchimp, GetResponse, Ontraport or Platformly.

Premium costs $79 a month, or $53 a month billed yearly, for 20 sites, 250 white-label audits a month and up to 250 Site Auditor Pro leads, alongside the rank tracking, keyword research and reporting tools in the same login. The next plan up, at $179 a month, raises that to 2,500 audits. Your first 30 days cost $7, and SERPed refunds in full within 30 days. For a technical crawl of a large site, pair it with Screaming Frog.

The SEO Spider is the crawler to open when you need to know exactly what is wrong with a site. You install it on Windows, macOS or Linux, give it a starting URL and it follows every link the way a search engine bot would. Screaming Frog says it checks for more than 300 SEO issues, including broken links and server errors, redirect chains and loops, missing or duplicate titles and descriptions, and exact, near-duplicate and similar pages. It renders JavaScript in a built-in Chromium browser, so sites built with React, Vue or Angular get a fair crawl.

The integrations make it more than a link checker. It pulls Google Analytics, Search Console and PageSpeed Insights data into the same crawl, so you can sort broken pages by the traffic they lose. It also builds XML sitemaps, checks accessibility against axe rules, and lets you run your own prompts through OpenAI, Gemini, Anthropic or Ollama while it crawls.

The free version stops at 500 URLs per crawl, which covers most small business sites. A license costs $279 a year per user and removes the cap; the real limit then becomes your computer's memory and storage. The results come as long tables, so expect to spend an afternoon learning which ones matter. If you would rather have the tool explain each issue, look at Sitebulb.

Sitebulb crawls a site much like Screaming Frog does, then sorts what it finds into Hints: plain explanations of each problem, ranked by how much it matters. Pro checks for more than 300 issues. That makes it a good choice for a consultant who has to explain an audit to a client, or a marketer who knows what a canonical tag is but does not want to read raw crawl tables.

The desktop app runs on Windows or Mac. Lite costs $18 a month and audits up to 10,000 URLs with more than 100 Hints, JavaScript crawling and connections to Google Analytics, Search Console and Google Sheets. Pro costs $42 a month for one user and raises the limit to 500,000 URLs per audit (you can push it to 2 million if your machine copes). It adds the full 300+ Hints, audit comparisons, scheduled audits and customized PDF reports you can send to a client. Yearly plans save 15%. Both plans now connect to Claude and ChatGPT through Sitebulb's MCP server, so you can ask questions about a crawl.

Sitebulb Cloud runs the same audits in your browser for teams, with up to 10 million URLs per audit, from $125 a month. The 14-day trial matches Pro and needs no card, so you can audit a real site before you pay.

Semrush's Site Audit runs more than 140 technical and on-page checks, including page speed, mobile friendliness and Core Web Vitals, and it can run on a schedule so new problems show up before a client notices them. The Semrush One plans add checks for issues that can hurt how a site appears in AI search results. The audit sits in the same account as keyword research, rank tracking and backlink data, which is the main reason to choose it.

Limits depend on the SEO toolkit you pay for. Pro covers 100,000 pages a month with up to 20,000 in one audit. Guru allows 300,000 pages a month, and Business allows 1,000,000 with up to 100,000 per audit. A free account audits 100 pages and gives you 10 reports a day across the main tools, which is enough to test the audit on a small site.

Semrush's plan FAQ lists the SEO toolkit at $139.95 a month for Pro, $249.95 for Guru and $499.95 for Business, with a 7-day trial. Its pricing page now uses newer plan names, so match the page limits to the plan before you buy. Adobe completed its purchase of Semrush on April 28, 2026, and the plans are still sold under the Semrush name. If an audit is all you need, Screaming Frog or Sitebulb costs far less.

Ahrefs Site Audit scans for more than 170 issues, gives each site a health score, renders JavaScript and reports Core Web Vitals using CrUX and Lighthouse data. Ahrefs describes its audits as always on, crawling around the clock so new problems show up early.

The best part for most site owners is the price. Site Audit is included in Ahrefs Free, which you can use on as many sites as you can verify as yours. Each verified project gets 5,000 crawl credits a month, and Ahrefs only spends a credit on an HTML page that loads correctly, so broken URLs, redirects, images and scripts do not count. That covers a typical small business site or blog every month. You also get Site Explorer with up to 1,000 of your backlinks and keywords.

The catch is competitors. Ahrefs Free only audits verified sites. To crawl a prospect's or rival's site you need a paid plan: Lite costs $129 a month with 100,000 crawl credits, Standard $249 with 500,000 and Advanced $449 with 1.5 million. Those plans are priced for backlink and keyword research, so buy one for the research and treat the audit as a bonus.

SE Ranking's Website Audit checks more than 115 metrics, from security and crawling to redirects and Core Web Vitals. Each audit gets a health score you can compare with earlier runs, and you can switch on JavaScript rendering for sites that build pages in the browser. Audits run weekly or monthly on their own, or whenever you start one.

The Core plan, at $129 a month or $103.20 a month billed yearly, gives you 250,000 audit pages a month across 10 projects, along with 2,000 keywords tracked daily, keyword research and backlink data. Growth, at $279 a month, raises the audit allowance to 2 million pages and adds manager seats. Compared with Semrush's Pro toolkit, you pay about the same and audit more pages.

Agencies can add the Agency Pack, from $69 a month on yearly billing. It includes white-label branding and a lead generator widget for your own site: a visitor enters a page, gets a technical health report and leaves their email. The 14-day trial needs no card.

Every audit tool above estimates how Google sees your site. Search Console is the only one that tells you. It is free, and it shows which pages Google has indexed and why others were left out, how your pages score on Core Web Vitals for mobile and desktop, and which structured data qualifies for rich results. URL Inspection gives the crawl, index and serving details for one page straight from Google's index, and lets you ask Google to crawl it again once you fix it. Google also emails you when it spots indexing, spam or other problems.

It has clear limits as an audit tool. It only covers sites you can prove you own, it reports problems Google has already hit rather than crawling every page for you, and it will not flag a missing title tag across a hundred pages the way a crawler will.

Set it up before you trial anything else. Screaming Frog and Sitebulb can both pull its data into a crawl, and its indexing report is the best way to check whether an issue a paid tool flags is hurting you in Google.