The SEO tool market is dominated by expensive all-in-one platforms. Ahrefs, SEMrush, and Moz Pro are excellent — but at £100–£400 per month, they are not the right starting point for every UK business. The good news: Google itself offers some of the most powerful SEO data available, entirely free, and a range of third-party tools provide meaningful capability at zero cost. Here are ten that belong in your toolkit.
Google's Own Free Tools
1. Google Search Console
The single most important free SEO tool available. Shows exactly which queries bring traffic to your site, your average ranking positions, click-through rates, indexing status, Core Web Vitals data, and mobile usability issues. No third-party tool has access to this data — it comes directly from Google. Set it up before anything else and check it monthly. (See our full guide to getting started with GSC.)
2. Google Analytics 4
Tracks what happens after people arrive from search — which pages they visit, how long they stay, which convert. Essential for understanding whether your SEO traffic is actually valuable or just high-volume, low-intent visitors. GA4's integration with Search Console connects search data to on-site behaviour for a complete picture.
3. Google PageSpeed Insights
Analyses your page speed and Core Web Vitals scores on both mobile and desktop. Provides specific, prioritised recommendations. Run your key landing pages through it regularly — a slow page losing you rankings is invisible without this tool. Free, no login required.
4. Google Keyword Planner
Originally built for Google Ads, Keyword Planner provides search volume data, keyword suggestions, and competition levels. Requires a Google Ads account (free to create, no spend required). The search volume data is less precise than paid tools (shown in ranges rather than exact numbers) but more than sufficient for initial keyword research and content planning.
Third-Party Free Tools
5. Ubersuggest (Free Tier)
Neil Patel's SEO tool offers a generous free tier covering keyword research (search volume, difficulty, CPC), domain analysis (organic keywords, top pages), and basic backlink data. Limited daily searches on the free plan, but enough for a small business doing regular research. Particularly good for generating long-tail keyword ideas from a seed term.
6. Ahrefs Webmaster Tools
Ahrefs offers a free version of their tool specifically for site owners — Ahrefs Webmaster Tools. After verifying your domain, you get access to their backlink index (one of the most comprehensive available), organic keyword rankings for your site, and a technical site audit. This is genuinely exceptional value — the backlink data alone is worth significant money in the paid tool market.
7. Screaming Frog SEO Spider (Free Version)
The free version crawls up to 500 URLs and identifies technical SEO issues: broken links, missing meta descriptions, duplicate title tags, redirect chains, canonical issues, and more. Indispensable for technical SEO audits. The free limit covers most small business sites entirely. Download the desktop app, point it at your domain, and it produces a comprehensive technical report in minutes.
8. Answer The Public
Visualises the questions, prepositions, and comparisons people search for around any keyword. Type "web design" and it returns hundreds of related queries: "web design for beginners", "web design vs web development", "how much does web design cost UK". An invaluable content ideation tool. The free version allows a limited number of daily searches.
9. Google's Rich Results Test
Validates your schema markup and shows whether your pages are eligible for rich results (FAQ dropdowns, star ratings, product information in search). Paste in a URL or code snippet and it tells you exactly what Google can read. Free, no account required, and essential if you are implementing structured data.
10. Detailed SEO Extension (Chrome)
A free Chrome browser extension that displays key SEO information for any page you visit: title tag, meta description, H1–H6 hierarchy, canonical tag, robots directives, schema types, and internal/external link counts. Invaluable for quickly auditing competitors' pages and your own. Install it, visit any page, and click the extension icon for an instant on-page SEO snapshot.
Building a Free SEO Stack
For a small UK business starting from scratch, this recommended combination covers all the fundamentals:
- Data and monitoring: Google Search Console + Google Analytics 4
- Keyword research: Google Keyword Planner + Ubersuggest
- Technical audit: Screaming Frog (free) + Google PageSpeed Insights
- Backlinks: Ahrefs Webmaster Tools
- Content ideas: Answer The Public
- On-page analysis: Detailed SEO Extension
Key Takeaway
Start with Google Search Console and Google Analytics 4 — these are non-negotiable and provide data no paid tool can replicate. Add Ahrefs Webmaster Tools for backlink intelligence and Screaming Frog for technical audits. This free stack covers 80% of what most UK small businesses need to run effective SEO. When you outgrow free limits, that is the right time to evaluate paid tools.
Final Thoughts
The gap between free and paid SEO tools is real but smaller than the tool vendors would have you believe. Professionals use paid tools for scale, deeper historical data, and time-saving workflows — not because the free alternatives are ineffective. For a UK business building its SEO foundations, the tools listed above are genuinely sufficient to identify and act on the highest-value opportunities. Start with the free stack, measure results, and invest in paid tools when a specific capability gap becomes clear.