7 Best Free SEO Audit Tools in 2026 (Compared)
Most free SEO audit tools check page speed and stop there. In 2026, what matters is whether AI search systems can find and cite your business. Here are 7 free tools compared on what they actually check, what they miss, and which one gives you the code to fix the problems.
Quick Comparison
| Tool | SEO Checks | Security | AI Visibility | Fix Code | Speed |
|---|---|---|---|---|---|
| BotMo | 15 | 9 | Yes | $27 | 30 sec |
| Google PageSpeed | 3 | No | No | No | 15 sec |
| Ahrefs Webmaster | 100+ | No | No | No | Hours |
| Semrush (free tier) | 130+ | Limited | No | Hours | |
| Ubersuggest | 8 | No | No | No | 30 sec |
| Screaming Frog (free) | 50+ | No | No | Minutes | |
| Google Search Console | 20+ | No | No | Ongoing |
The Tools
1. BotMo
Free instant scan that checks 15 SEO signals and 9 security signals in 30 seconds. No account needed. Gives you a score out of 100, a letter grade, a pass/fail checklist, and a security vulnerability rating. The $27 fix guide includes copy-paste code for every issue.
The only tool on this list that checks AI visibility signals specifically. Schema markup, structured data, security headers, and the technical signals that AI Overviews, ChatGPT, and Perplexity use to decide which businesses to cite.
Best for: Local businesses that want to know their AI visibility score and get the fix code without hiring an agency.
Limitation: Single-page scan. Does not crawl your entire site like Ahrefs or Screaming Frog.
2. Google PageSpeed Insights
Checks page speed, Core Web Vitals, and basic performance metrics. Free. No account needed. Shows load time, largest contentful paint, cumulative layout shift, and first input delay.
Best for: Checking if your site loads fast enough.
Limitation: Only checks speed. Does not check title tags, schema markup, meta descriptions, security headers, or any of the SEO signals that AI uses to rank businesses. If PageSpeed says you are fine, you still might be invisible to AI.
3. Ahrefs Webmaster Tools
Free version of Ahrefs that crawls your site and checks 100+ SEO issues. Requires account and site verification. Full crawl takes hours but gives detailed technical SEO data.
Best for: Deep technical SEO audits on large sites.
Limitation: Requires account. Takes hours. Does not check security. Does not give fix code. Does not check AI visibility signals specifically.
4. Semrush (Free Tier)
The free tier lets you audit up to 100 pages and track 10 keywords. Very thorough technical checks. Industry standard for agencies.
Best for: Agencies and marketers who need detailed reports for clients.
Limitation: Free tier is heavily limited. Full version costs $130 to $500 per month. Does not provide fix code. Does not check AI visibility specifically.
5. Ubersuggest
Neil Patel's free SEO tool. Checks basic on-page SEO, keyword rankings, and backlinks. Simple interface good for beginners.
Best for: Beginners who want a simple overview.
Limitation: Limited free searches per day. Surface-level checks. No security scan. No fix code. No AI visibility data.
6. Screaming Frog (Free)
Desktop crawler that scans up to 500 URLs for free. Very technical. Checks broken links, redirects, duplicate content, and more.
Best for: Technical SEOs who know what they are looking for.
Limitation: Desktop software. Steep learning curve. No security scan. No fix code. No AI visibility check. You need to know what the data means.
7. Google Search Console
Google's own tool for monitoring how your site appears in search. Shows indexing status, search queries, click data, and technical issues Google found.
Best for: Ongoing monitoring of your Google search presence.
Limitation: Not a one-time audit tool. Requires verification. Data is delayed by days. Does not check security. Does not give fix code.
Which Tool Should You Use?
It depends on what you need.
If you want to know your AI visibility score and get the code to fix issues, use BotMo. It is the only tool that checks all 24 signals AI uses and gives you copy-paste fixes.
If you need a deep crawl of a large site, use Ahrefs or Screaming Frog.
If you only care about page speed, use Google PageSpeed Insights.
If you have $130 or more per month for ongoing SEO monitoring, use Semrush.
For most local businesses, BotMo plus Google Search Console covers everything.