How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- Google Keyword Planner is the best free source of demand data, with unlimited searches but volume shown in ranges rather than exact counts.
- Google Search Console is the best free tool for sites that already rank, showing the real queries that bring impressions and clicks.
- Ahrefs Free Keyword Generator is the best free idea dump, with about 100 ideas per search and no login required.
- Semrush's free account is the best free sample of professional data, but it caps at 10 searches per day with 10 results each.
- AnswerThePublic is the best free question finder, though its free plan allows only 3 searches per day.
Quick comparison
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Starting priceFree
Free planYes
Google Keyword Planner is the best free source of demand data, because it draws on Google's own search data rather than a third party estimate. It is free with a Google Ads account, offers unlimited searches, and shows volume ranges, CPC estimates, location filters, and seasonality. For comparing relative demand between topics, it is the most reliable free source available.
Without ad spend, volume appears in broad ranges such as 1,000 to 10,000 rather than exact counts, and its competition metric measures advertiser competition, not SEO difficulty. A high CPC keyword is not automatically valuable for organic search. For demand validation and topic comparison, Keyword Planner is the first tool to open.
What we like- Unlimited searches
- Volume and CPC data straight from Google
- Location and seasonality filters
Watch out for- Volume shown in ranges without ad spend
- Built for advertisers, not SEO
- Competition means ad competition, not SEO difficulty
#2Google Search Console
Best for: Queries you already rank for4.7/5 on
G2 (513 reviews, checked Oct 2026)
Visit search.google.com
Starting priceFree
Free planYes
Google Search Console is the best free tool for sites that already rank, because it shows the real queries that bring impressions and clicks, plus the pages and positions behind them. It is unlimited and free forever for verified properties. Its most valuable use is finding near misses: queries where a page ranks on page two and could reach page one with a better title or a new section.
Search Console only covers your own sites, so it cannot size a new market, and very large sites see sampled data. For optimizing existing pages and finding content gaps on a live site, it is the first place to look, before any keyword generator.
What we like- Unlimited and free forever
- Shows real queries, impressions, clicks, and positions
- Reveals near misses to optimize
Watch out for- Only covers sites you can verify
- No total market volume
- Data is sampled on very large sites
Starting priceFree
Free planYes
Google Trends is the best free tool for seasonality and trend direction, showing whether a topic is rising, falling, or seasonal over time and across regions. It is unlimited and free, and it answers a question volume tools cannot: is this topic worth building for now, or is interest fading? A keyword with steady volume may be a better bet than one with a short spike.
Trends shows normalized interest on a 0 to 100 scale, not absolute search counts, so it cannot size a market alone. Pair it with Keyword Planner for volume and Search Console for your own performance. For content planning and timing, Trends is an essential free check.
What we like- Unlimited and free
- Shows seasonality and whether a topic is rising or dying
- Regional interest breakdowns
Watch out for- Relative values only, not absolute volume
- No difficulty or intent data
- Short term spikes can mislead
Starting priceFree
Free planYes
Ahrefs Free Keyword Generator is the best free idea dump, giving about 100 ideas per search with volume and difficulty estimates and no login required. It is the fastest way to expand a seed topic into a list of related phrases, questions, and variations, and it works for Google, YouTube, Bing, and Amazon keyword data in some versions.
The free generator shows far less depth than paid Ahrefs, with capped output per search and no exports or history. Difficulty scores are estimates based on backlink data, not a promise of ranking. For quick spot checks and idea expansion, it is the best free generator available.
What we like- About 100 ideas per search with volume and difficulty
- No login required
- Question and phrase filters
Watch out for- Limited depth versus paid Ahrefs
- Output caps per search
- Difficulty scores are estimates, not guarantees
#5Semrush
Best for: Professional data sample4.4/5 on
G2 (4,035 reviews, checked Oct 2026)
Visit semrush.com
Starting priceFree
Free planYes
Semrush's free account is the best free sample of professional keyword data, with real keyword difficulty, search intent, topic clustering, and SERP context for the top ranking pages. Its Keyword Magic Tool groups ideas by topic and filters by question type, which helps plan content clusters rather than single pages.
The free account caps at 10 searches per day with 10 results each, which runs out fast for a large project. For sampling professional data on a handful of topics per day, it is excellent. For daily research at scale, a paid plan or a combination of free tools is needed.
What we like- Real keyword difficulty, intent, and clustering data
- SERP context for top results
- Topic groups and question filters
Watch out for- Free account caps at 10 searches per day with 10 results each
- Runs out fast for large projects
- Full tool costs $139.95 per month
Starting priceFree
Free planYes
AnswerThePublic is the best free question finder, turning a seed topic into visual maps of questions, prepositions, and comparisons that people actually search. It is excellent for FAQ sections, long tail angles, and content ideas that keyword generators miss, because questions reveal intent that short phrases hide.
The free plan allows only 3 searches per day, shows no volume data, and caps exports at 30 keywords. Ideas are not proof of demand, so validate the best questions in Keyword Planner before building a page around them. For content ideation, AnswerThePublic is unmatched at its price.
What we like- Visual question, preposition, and comparison maps
- Excellent for FAQ and long tail angles
- Country and language options
Watch out for- Free plan allows only 3 searches per day
- No volume data on the free plan
- Exports capped at 30 keywords
#7Ubersuggest
Best for: Beginner all in one view4.2/5 on
G2 (160 reviews, checked Oct 2026)
Visit neilpatel.com
Starting priceFree
Free planYes
Ubersuggest is the best beginner friendly free tool, combining volume, difficulty, SERP data, and content ideas in one simple view. The web free plan allows about 3 searches per day, while the browser extension allows roughly 40 lookups per day, which makes the extension the practical way to use it free. It suits casual lookups and beginners who want one dashboard rather than three tools.
Difficulty scores can look too easy compared with Ahrefs or Semrush, and data depth is thinner than the paid platforms. Do not rely on Ubersuggest alone for a competitive niche. For beginners and casual research, its simplicity is a real advantage.
What we like- Volume, difficulty, and SERP data in one beginner friendly view
- Extension allows about 40 lookups per day
- Content ideas included
Watch out for- Web free plan allows only 3 searches per day
- Difficulty scores can look too easy
- Data depth is thinner than Ahrefs or Semrush
Starting priceFree
Free planYes
Keyword Surfer is a free Chrome extension that overlays estimated search volumes on Google results as you browse, with related ideas on every search. It is unlimited and genuinely free, and it turns ordinary browsing into research: every Google search you run anyway becomes a chance to see volume and related phrases.
Estimates are moderate accuracy, and the tool gives no difficulty or intent data, so it cannot judge competition alone. For inline research while browsing and for quick volume checks without opening a separate tool, Keyword Surfer is the best free extension available.
What we like- Unlimited and genuinely free
- Volumes overlaid on Google results as you browse
- Related ideas on every search
Watch out for- Browser extension only
- Estimates are moderate accuracy
- No difficulty or intent data
How we chose
We compared free keyword research tools using their published free limits, data sources, and coverage as checked in 2026, drawing on vendor pages and independent free tool comparisons. Each tool had to offer a genuinely free tier, not only a trial, and had to provide keyword ideas, demand data, or performance data. We weighted free tier generosity, data reliability, and ease of use, and we left out tools that only offer a short trial or that stopped being free. Limits change often, so confirm the current cap before depending on one.
Buying guide: how to do free keyword research
Start with your own data. Open Google Search Console and list the queries where your pages already get impressions but rank on page two. Those near misses are the fastest wins, because Google already considers your pages relevant. Add the questions those pages should answer better, using AnswerThePublic for question ideas.
Next, size demand with Keyword Planner. Run your best candidates through it to compare relative volume and seasonality, and use Google Trends to check whether interest is rising or fading. A topic with steady or rising interest and a clear intent match is worth building for. A topic with a short spike may not be.
Then expand ideas with the free generators. Run seed topics through Ahrefs Free Keyword Generator for about 100 ideas per search, sample Semrush's free account for difficulty and intent on your top candidates, and use Keyword Surfer while browsing to catch related phrases. Group related phrases under one page rather than one page per phrase, and pick a primary phrase plus a handful of natural variations for each page.
Finally, validate with real search results. Search your top candidates in a private window and study what ranks: the page types, lengths, and angles that Google already rewards. If every top result is a major authority site, a new site may struggle. If the results are thin or outdated, that gap is your opening. Record everything in a spreadsheet with columns for intent, volume range, difficulty, and the page it belongs to.
Frequently asked questions
What is the best completely free keyword research tool?
Google Keyword Planner for demand data and Google Search Console for your own site's performance are the best completely free tools, with no daily caps. For idea generation, Ahrefs Free Keyword Generator gives about 100 ideas per search with no login. Combine two or three free tools rather than relying on one.
How accurate are free keyword volume estimates?
Google Keyword Planner gives ranges without ad spend, and third party tools estimate volume from their own data, so treat all free volumes as relative, not exact. Compare topics against each other rather than trusting a single number, and validate with Search Console data once a page ranks.
Why do free tools cap searches per day?
Free tiers are samples of paid products, so vendors limit daily searches to encourage upgrades. Semrush caps at 10 searches per day, AnswerThePublic at 3, and Ubersuggest at 3 on the web. Spreading research across several free tools avoids hitting any single cap.
Do I need a paid tool for serious SEO?
Not at first. A small site can plan content with Keyword Planner, Search Console, Trends, Ahrefs free generator, and AnswerThePublic. Paid tools become worth it when you need large scale tracking, competitor analysis, or daily research volume that free caps cannot cover.
What is keyword difficulty, and can I trust it?
Keyword difficulty estimates how hard it is to rank for a phrase, usually from backlink data on top results. Scores differ between vendors because methods differ, and Ubersuggest scores can look too easy. Treat difficulty as a rough guide, and check the actual top results before deciding.
How many keywords should one page target?
One primary phrase plus a handful of natural variations. Group related phrases under one page rather than creating a thin page per phrase. A page that answers a topic thoroughly ranks for many related queries, which Search Console will reveal over time.
Sources we checked (0)
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.
Google Keyword Planner
Google Trends
Ahrefs Keyword Generator
AnswerThePublic
Keyword Surfer