The best keyword research tools, free and paid, by what you need

Decide by the job, not a leaderboard. Your needs are: volumes you can trust, the markets you sell in, the questions your buyers ask, how hard a page will be, and how to group topics into clusters you can ship.

• Volume source: every tool models volume. Search Console is your truth for your own clicks and impressions. Everything else is an estimate.
• Markets and language: you need country and, if relevant, language filters that match where you sell. A US-only estimate will mislead a UK SaaS.
• Intent and SERP shape: the results page tells you if a query wants a product page, a how-to or a comparison. Tools that preview SERPs help, but you can also check live.
• Difficulty: each suite has its own score. Treat it as relative inside that tool. Cross-check by reading the top results and their link profiles.
• Questions and variants: autocomplete, People also ask, and question tools show how buyers phrase things. Use them to write headings, not to stuff keywords.
• Clustering: some tools group terms. You can also do this by hand with a spreadsheet and the SERPs.
• Freshness: trends move. Check Google Trends for seasonality before you commit a sprint.

Use the free stack first. It covers research, intent and validation well enough for a small site.

• Google Search Console: free. Shows queries, pages, impressions, clicks and positions for your site. Use the Performance report to spot themes, rising terms and pages close to page one.
• Google Keyword Planner: free with a Google Ads account. Gives volume ranges without spend. Good to sanity check big head terms and to see related ideas.
• Google Trends: free. Shows relative interest over time. Good for seasonality and breakouts.
• Autocomplete and People also ask: free in the search results. Collect how people phrase problems and compare intents across markets.
• Bing Webmaster Tools: free. Includes backlinks, keyword research and IndexNow. Handy for extra ideas and to compare wording in Bing.
• Ahrefs Webmaster Tools: free for verified sites. Use Site Explorer and Site Audit on your own site to see backlinks and tech issues that may block pages from ranking.

A simple pass: pull your top-200 queries in Search Console, group them by theme, then check the biggest gaps with Keyword Planner and Trends. This gives you a plan without paying for a suite.

If you want one paid tool to go faster, pick a beginner suite built for small sites. These balance guidance with simple views.

• Mangools: five tools aimed at beginners and small teams. KWFinder gives keyword ideas with a difficulty score. SERPWatcher tracks ranks. LinkMiner uses Majestic’s link data. SERPChecker and SiteProfiler round it out.
• Ubersuggest: built for beginners by NP Digital. Gives keyword ideas, a site audit, rank tracking and backlink data. Has a free daily allowance. Its data is smaller than the large suites.
• SE Ranking: covers rank tracking, website audit, keyword and competitive research, backlinks, on-page checks and an AI writing assistant, with agency features. Often chosen as the affordable full suite.
• Moz Pro: holds Keyword Explorer, Link Explorer, Site Crawl, Rank Tracking and On-Page Grader. Backed by long-standing education. Domain Authority is Moz’s 0 to 100 score, not Google’s.

Pick one. If you publish one new page a week, any of these will be enough. Your bottleneck will be writing and shipping, not ideas.

If you work across markets, rivals and backlinks, choose a broad suite. The big ones have deeper indexes and more modules you may grow into.

• Ahrefs: known for its backlink index and Site Explorer. Also has Keywords Explorer, Site Audit, Rank Tracker and Content Explorer. Domain Rating runs 0 to 100 based on links.
• Semrush: a broad suite. Keyword Magic Tool, Position Tracking, Site Audit, Backlink Analytics and competitive research. Adds advertising and content modules. Authority Score summarises strength.
• Moz Pro: the core modules plus education and the MozBar extension for quick on-page checks.
• SE Ranking: a full suite that many pick when they need coverage at a smaller spend profile than the two big suites.
• SpyFu: specialises in search and paid keyword history of domains, with overlap views and outreach lists. Use it to see what a rival bought or ranked on over years. Weaker on auditing your own site.

If backlinks decide your market, you will spend most time in Site Explorer and Backlink Analytics. If content decides it, Keyword Magic Tool, Keywords Explorer and topic tools will be your home. Match the suite to the job you do weekly, not to a long feature list you will not use.

Use question tools to shape headings and FAQs. They show how people ask, by country and language. They do not replace your own SERP read.

• AnswerThePublic: visualises autocomplete suggestions as wheels of questions, prepositions and comparisons. Part of NP Digital.
• AlsoAsked: maps People also ask questions as trees, several levels deep, by country and language. Handy for nested FAQs.
• Keywords Everywhere: a browser extension that shows volumes on the results page. Speeds up triage.
• People also ask and related searches: free and live. Copy the phrases your buyers use into subheadings on pages like /guides/getting-started and /pricing.
• Google Trends: check if the question is growing or fading.

A fixed page might read the top three PAA questions into H2s, answer each in two short paragraphs, and link to a deeper guide for the one you want to rank with.

You can find and sort keywords with only a browser and a spreadsheet. This is enough for a niche product and a site under 200 pages.

1. 1

   List buyer jobs and pages you sell with

   Write ten buyer jobs and the pages you have or plan: /pricing, /features/x, /guides/getting-started, /compare/you-vs-alt.

2. 2

   Turn jobs into seed queries

   For each job, write how a buyer would search it. Use natural phrases. Example: “invoice automation for freelancers”, “how to reconcile Stripe payouts”.

3. 3

   Read the SERP to learn intent

   Search each seed. Note the mix: guides, tools, templates, comparisons. If the top ten are all “what is” posts, do not target it with /pricing.

4. 4

   Harvest questions live

   Expand People also ask for five minutes. Copy useful questions into your sheet. Stop when they loop or go off-topic.

5. 5

   Cluster by page

   Group terms that fit one page. Do not split near-duplicates. Keep one primary, a few close variants and the questions as subheads.

6. 6

   Sanity check volume and seasonality

   Use Keyword Planner ranges and Google Trends. If both are flat near zero, park it unless it is a crucial sales term.

7. 7

   Ship and measure

   Publish. Add internal links from related pages. In Search Console, watch impressions and queries for 28 days. Tweak titles and headings once you see the terms you surface for.

This beats hunting a perfect score. When you find a good cluster, build three related pages in a fortnight and interlink them. Example: /compare/you-vs-x, /alternatives/x, and /guides/x-migration-checklist.

Use this to pick fast by need. If two rows fit, start with the free one and add the paid tool only if you stall.

Run this each month. It balances ideas with shipping and keeps you on terms that buy.

1. 1

   Mine real demand

   In Search Console, filter last 28 days. Sort by impressions. Tag themes where you already appear but do not yet have a focused page.

2. 2

   Expand with one tool

   Pick one of KWFinder, Ubersuggest or Semrush Keyword Magic Tool. For each theme, pull 20 to 50 ideas and questions. Dedupe obvious variants.

3. 3

   Check markets

   Set country filters to your buyers. If you sell only in the UK, ignore US spikes unless you plan to expand.

4. 4

   Read intent on the SERP

   Open the top results for your short list. Note content type, depth, and any SERP features like featured snippets. Cut misfits.

5. 5

   Prioritise by page type and effort

   Favour queries where one good guide or one comparison page can win. Park broad definitions and newsy terms.

6. 6

   Draft titles and H2s

   Write a 60-character title and three to five H2s that mirror the questions. Example: “Invoice automation for freelancers, setup and tools”.

7. 7

   Ship, link, and measure

   Publish two pages. Link them from /pricing and /guides. Watch queries in Search Console. If you see “striking distance” terms, tune the title and add an FAQ.

Keep a backlog of clusters. When one starts to move, build the neighbouring page next. This builds topical coverage and helps internal links carry weight across your /guides and /compare pages.

• Chasing the biggest index: you do not need the deepest data to plan five pages. You need the right intent and a page you can ship.
• Confusing pre-click with post-click: Search Console and Google Analytics 4 never match exactly. Use Search Console for queries. Use GA4 for what those visits did.
• Over-trusting one difficulty score: they are proprietary. Read the SERP and the top results’ link profiles too.
• Mixing markets: decide the country first. A term that works in the US may be odd in the UK.
• Ignoring questions: your H2s should mirror how buyers ask. That earns snippets and AI cites as of 2026.
• Skipping the audit: if your site fails to crawl, no keyword plan will save it. Run a crawl with Screaming Frog SEO Spider or Sitebulb first.

A fixed page matches the searcher’s intent, answers three common questions inline, and links to your product page at natural points without fluff or jargon.