Best SEO tools in 2026
Software for keyword research, backlink analysis, rank tracking and site audits — and, since 2025, tracking how a brand appears in AI answers from ChatGPT, Perplexity and Google's AI Overviews. The category splits between full suites and lighter, cheaper specialists.
The ranking
| # | Tool | Starting price | Best for | Score | |
|---|---|---|---|---|---|
| 1 | Semrush Top pick | £113/mo | Teams that want every SEO and AI-search job in a single suite and can justify the price. | | Visit |
| 2 | Ahrefs | Free, then £23/mo Free tier | Anyone whose SEO work centres on links and competitor research. | | Visit |
| 3 | SE Ranking | £95/mo | Freelancers and small agencies who want most of a full suite at a fraction of the price. | | Visit |
| 4 | Moz Pro | $49/mo | Small businesses and marketers who want an established SEO suite with AI-search tracking at a mid-range price. | | Visit |
| 5 | Mangools | $61/mo | Bloggers and beginners who mainly need keyword research and a simple rank tracker. | | Visit |
| 6 | Surfer SEO | $59/mo | Content teams that want to write pages that rank and track how AI answers mention their brand. | | Visit |
Ranked on weighted capability scores, weighted most heavily towards backlink data and rank tracking. Commission is not an input — see methodology.
Best by use case
An overall ranking is a compromise. These reweight the same scores for a specific job, and the top pick is not always the same one.
Best SEO tools for beginners
Keyword research that is easy to understand, at a price that makes sense before the site earns anything.
Top pick: MangoolsBest SEO tools for agencies
Tracking many client sites at once — rankings, audits and reporting — without a separate tool for each job.
Top pick: SemrushBest SEO tools for backlink research
The biggest, freshest backlink index, for finding link opportunities and seeing what competitors earned.
Top pick: AhrefsBest tools for tracking AI search visibility
Seeing whether ChatGPT, Perplexity and AI Overviews mention your brand — and for which prompts.
Top pick: SemrushHead to head
Every tool in detail
1. Semrush
The broadest SEO suite on the market, now bundling AI-search visibility tracking into most plans.
Strengths
- +The widest toolset in the category — keyword research, rank tracking, audits, competitor analysis and AI-search tracking in one login.
- +Every plan includes some AI-search tracking; Starter and above add daily prompt tracking, starting at 50 prompts.
- +Tracks rankings daily and supports multi-location and device tracking on Pro+ and above.
Limitations
- −Expensive — £113 a month for the entry SEO plan, and extra users cost from £36 a month each.
- −Historical SEO data and content optimisation tools start at Pro+, £242 a month.
- −The sheer number of tools makes it slow to learn for a first-time user.
2. Ahrefs
The SEO suite best known for its backlink index, powered by one of the most active crawlers on the web.
Strengths
- +Its backlink and site data come from what Ahrefs describes as the world's second-most active web crawler.
- +A genuinely useful free plan for sites you own, and a £23 Starter plan for light keyword research.
- +API and MCP access included on every paid plan from Lite upwards.
Limitations
- −Lite is £99 a month with only six months of historical data and one user.
- −Additional users cost £32–£64 a month each depending on plan.
- −AI prompt tracking is limited — five prompts on Lite, twenty on Advanced.
3. SE Ranking
A capable all-round SEO platform priced well below the big two, with strong rank tracking and AI-search (GEO) tools.
Strengths
- +Core gives twice the projects and four times the tracked keywords of Semrush's entry plan (10 and 2,000), for less — £95 a month.
- +AI-search tracking comes built in: 100 prompts a day on Core, 250 on Growth.
- +Unlimited keyword, competitor and backlink research on every plan.
Limitations
- −API use is capped — 25,000 credits a month on Core.
- −White-label reporting for agencies is a £49-a-month add-on, annual billing only.
- −Historical data across a project's lifetime needs the Growth plan.
4. Moz Pro
A long-established SEO suite — keywords, links, rank tracking and audits — now with AI-search visibility tracking.
Strengths
- +Standard and above track AI visibility across ChatGPT, Gemini, Google AI Mode and Perplexity.
- +Standard tracks 3 sites and 300 keywords and crawls 400,000 pages a month.
- +A $49 Starter plan for a single website, and a free trial on Medium.
Limitations
- −Standard includes one user; a second needs Medium, at $179 a month.
- −AI content briefs are capped at 2 a month on Standard and 10 on Medium.
- −AI prompts are tracked weekly on every plan, not daily.
5. Mangools
A set of simple, beginner-friendly SEO tools — best known for KWFinder — at the lowest prices in this comparison.
Strengths
- +Built around KWFinder, a dedicated keyword research tool, with rank tracking and backlink lookups alongside.
- +Annual billing brings the Basic plan to about $38 a month.
- +A handful of single-purpose tools — KWFinder, SERPWatcher, LinkMiner and others — rather than one sprawling suite.
Limitations
- −There is no full technical site-audit crawler, unlike the three suites here.
- −Monthly billing costs about 60% more than annual — $61 against roughly $38.
- −The refund window is only 48 hours.
6. Surfer SEO
A content optimisation and AI-visibility platform: write pages built to rank, then track how AI answers mention you.
Strengths
- +Tracks how AI models including ChatGPT, Gemini and AI Overviews mention your brand, from the Standard plan.
- +Standard includes 360 documents with one-click content optimisation and a plagiarism checker.
- +Discovery, at $49 a month billed yearly, covers 120 documents and 10 tracked pages.
Limitations
- −Its plans list no backlink analysis, so link research needs another tool.
- −Monthly billing costs about 20% more: Standard is $119 a month, or $99 billed yearly.
- −API access needs Peace of Mind, at $359 a month ($299 billed yearly).
Common questions
What is the best SEO tool overall?
On our weighted scoring across every use case in this category, Semrush ranks first with 84/100, ahead of Ahrefs on 81. It leads mainly on rank tracking and site audits.
Is there a free SEO tool?
Yes — Ahrefs offers a free plan. Free tiers differ enormously in what they actually allow, so check the limits rather than the label.
What is the cheapest SEO tool?
Ahrefs at £23/mo (monthly; keyword and competitor research only) has the lowest paid entry point. Prices in different currencies were compared at the European Central Bank reference rate. Cheapest is rarely best value — check what the next tier up costs and what the plan renews at, because that is where most people end up.
Sources & verification
- ahrefs.com — checked 23 September 2026Ahrefs Free covers data for sites you own; researching competitors needs a paid plan.
- api.frankfurter.app — checked 6 November 2026European Central Bank reference rate, published via Frankfurter.
- mangools.com — checked 23 September 2026No free plan, though Mangools publishes several free standalone SEO tools.
- moz.com — checked 24 September 2026No free Moz Pro plan; Medium has a free trial. Moz also offers separate free SEO tools.
- seranking.com — checked 23 September 2026No free plan; a 14-day free trial with no card required.
- surferseo.com — checked 24 September 2026No free plan is listed on the pricing page.
- semrush.com — checked 23 September 2026Free trial available on paid plans; no free plan listed on the pricing page.