You don’t need a $140/month Semrush subscription to do SEO. Here are 15 genuinely free tools that cover everything from keyword research to technical audits.
Free Keyword Research Tools
1. Google Search Console (Free, Essential)
The single most important free SEO tool. Shows exactly which queries your site ranks for, click-through rates, and impressions. Directly from Google — no tool approximates it.
Best for: Finding keyword opportunities in your existing content, tracking ranking changes.
Limitation: Only works for your own site. No competitor data.
2. Google Keyword Planner (Free with Ads account)
Google’s own keyword research tool shows search volumes and competition data. Requires a Google Ads account but you don’t need to run ads.
Best for: Finding search volumes for new keyword targets.
Limitation: Volumes are shown as ranges (100–1K, 1K–10K) unless you spend money on ads.
3. Ahrefs Free Tools (Actually Free)
Ahrefs offers several free tools at ahrefs.com/free-seo-tools:
- Ahrefs Webmaster Tools: Site audit + backlink data for your own site (free forever)
- Keyword Generator: 100 keyword ideas per search
- SERP Checker: See top 10 rankings for any keyword
- Backlink Checker: Top 100 backlinks for any domain
4. Ubersuggest (Free Tier)
Ubersuggest offers 3 free searches/day with keyword ideas, search volume, and difficulty scores.
Best for: Quick keyword checks when you don’t need deep data.
5. Answer The Public (2 free searches/day)
Visual tool that shows the questions and phrases people search around any keyword. Excellent for content ideation.
Best for: Finding long-tail question keywords for blog posts.
Free Backlink Analysis Tools
6. Ahrefs Backlink Checker (Free)
Top 100 backlinks for any domain, completely free. Powered by Ahrefs’ database — the same data you’d pay $129/month for in the Lite plan.
Access: ahrefs.com/backlink-checker
7. Moz Link Explorer (10 free queries/month)
Moz’s DA (Domain Authority) checker and basic backlink data. Requires a free account.
Best for: Checking DA for competitor or potential link partner sites.
Free Technical SEO Tools
8. Google PageSpeed Insights (Free)
Tests your page speed and Core Web Vitals directly from Google. Shows exactly what’s slowing down your pages with fix recommendations.
Best for: Pre-launch site audits and finding CWV issues.
9. Screaming Frog SEO Spider (Free up to 500 URLs)
The most powerful free technical SEO crawler. Finds broken links, duplicate content, missing meta tags, redirect chains, and much more.
Best for: Technical audits for sites under 500 pages (free version limit).
Limitation: 500 URL cap. For larger sites, the paid version is £149/year.
10. GTmetrix (Free Tier)
More detailed page speed analysis than PageSpeed Insights, with waterfall charts and video recordings of page load.
Best for: Diagnosing specific performance bottlenecks.
11. Bing Webmaster Tools (Free)
Often overlooked, but Bing’s tools include a free backlink report and keyword research that sometimes surface different data than Google.
Best for: Getting a second perspective on your technical health and keyword opportunities.
Free Rank Tracking Tools
12. Google Search Console (Again)
GSC’s Performance report is the most accurate rank tracker for your own queries — because it’s Google’s actual data.
Best for: Tracking ranking changes over time for keywords you already rank for.
13. Rank Math (Free WordPress Plugin)
Combines on-page SEO analysis, schema markup, sitemap generation, and rank tracking in one free WordPress plugin.
Best for: WordPress sites needing all-in-one on-page optimization.
Free Site Audit Tools
14. Ahrefs Site Audit via Webmaster Tools (Free)
The full Ahrefs site audit crawls your site and identifies 100+ technical issues — crawl errors, slow pages, missing meta descriptions, broken links. Free for your own sites.
Access: Sign up for Ahrefs Webmaster Tools (free, verify domain ownership).
15. Semrush Site Audit (10 free crawls)
Semrush’s free account includes 10 site audits with 100 pages each. Good for a monthly health check.
The Best Free SEO Stack (Zero Budget)
Combine these for a full free SEO setup:
| Need | Tool | Cost |
|---|---|---|
| Traffic & ranking data | Google Search Console | Free |
| Keyword research | Ahrefs Keyword Generator + Answer The Public | Free |
| Backlink analysis | Ahrefs Backlink Checker + Webmaster Tools | Free |
| Technical audit | Screaming Frog (500 URLs) + GSC | Free |
| Page speed | PageSpeed Insights + GTmetrix | Free |
| On-page optimization | Rank Math (WordPress) | Free |
This stack covers 80% of what you’d do with a paid tool. You only need to pay when you need:
- Competitor keyword data
- More than 500 pages in technical audits
- Historical data trends
- Ongoing rank tracking for 100+ keywords
When to Upgrade to a Paid Tool
Consider paying when:
- You need competitor keyword data (what keywords competitors rank for)
- You’re tracking 50+ keywords consistently
- You’re doing site audits for client sites (not just your own)
- You need backlink prospecting for link building campaigns
For most of these, Ahrefs Starter ($29/month) or Semrush Pro ($140/month) is the next step up.
Compare paid SEO tools → Ahrefs Pricing 2026 | Ahrefs vs. Semrush