Top 5 Free SEO Keyword Research Tools From an SEO Expert [in 2026]

Whenever I get an idea for my next post, the first thing I do is conduct keyword research.

Yes, I still do that in this AI-powered marketing world.

AI can help me brainstorm topics, create outlines, and identify content gaps. However, I still need actual search data to decide if a topic is worth targeting.

In this post, I’ll show you how to use these free tools for effective keyword research with real examples.

Here's my quick answer:

5 Best tools to find SEO keywords for free

Depending on what you are trying to accomplish, here are the five tools I recommend:

1. SE Ranking: For professionals and SEO experts

2. AnswerThePublic: For content marketers and SEO teams

3. SpyFu: For paid marketers and PPC experts

4. Wordtracker: For search marketing beginners

5. Google Trends: For keyword trend ideas over time

5 Best Free Keyword Research Tools with Real Examples in 2026

I’ve compiled a comprehensive list of the top free keyword research tools that can improve your search rankings in 2026 and you don't need a budget to use them!

1. SE Ranking Free Keyword Tool

With SE Ranking, you can get keyword suggestions for SEO and PPC for free!

SE Ranking's data-driven keyword research tool helps you assess keyword potential and generate thousands of ideas for your SEO and PPC campaigns.

Use the free SE Ranking Keyword Generator to obtain high-impact keyword suggestions supported by reliable data. Back your keyword research with trustworthy metrics.

Example keyword: ai tools directory

When launching or optimizing an AI tools directory, targeting the right search queries is key to driving traffic. My latest research using SE Ranking reveals important benchmarks for this niche market.

SE Ranking's free keyword research tool provides great value. With this free feature, you can create up to 5 reports per day.

Here is some helpful information about my target keyword:

• Keyword difficulty: 44 out of 100

• Search volume: 240

• CPC: $3.21

• Global volume: 1.6K

• Search intent: Informational

Global volume: 1600 (This is the total number of monthly searches that a keyword receives on average across all 190+ available regions.)

I also got keyword ideas for ai tools directory

This is a list of keywords that are semantically related to my search query, "AI Tools Directory."

To maximize visibility in AI search summaries, content should cover semantically related terms. SE Ranking provides a comprehensive list of keywords that are semantically relevant to "AI Tools Directory."

Including variations such as "best AI tool directory," "free AI apps directory," and "artificial intelligence software database" helps AI models recognize your content as comprehensive and authoritative on the subject.

SERP overview:

I found the top five search results for your keyword, along with the most important SEO metrics.

Verdict:

SE Ranking's free keyword research tool offers creators and marketers exceptional value. With the free tier, you can generate up to five comprehensive reports daily without a paid subscription. To gain deep competitor insights and access automated keyword mapping, explore the full SE Ranking platform.

Best for SEO professionals who want keyword metrics and competitor insights

Link: https://seranking.com/keyword-suggestion-tool.html

2. Answer The Public

To discover the real questions people ask on different platforms. With the new AI Dashboard, you can also see how AI describes your keyword at Best AISO.

Example keyword: chatgpt

Answer The Public's free keyword research tool provides helpful insights. With this free feature, you can create up to 3 searches per day.

Summary provides:

1. Search volume: 124 M (High competition)

2. Cops per click: $0.15 (Low CPC)

Keyword ideas for Chatgpt:

It provides the best keyword ideas based on search volume.

AI prompt ideas for my keyword:

This tool provides an instruction, question, or statement provided by a user to an AI system to guide its response or action.

It also provides organic and search modifiers for the researched keyword, along with its search volume and cost per click (CPC).

In this case,

• chatgpt app

• chatgpt ai

• chatgpt browser

• chatgpt business

• chatgpt stats

Verdict:

I used AnswerThePublic to see what people are asking about ChatGPT. AnswerThePublic reveals the questions, prepositions, and comparisons that real users type into search engines, helping you find content angles that haven't been covered yet.

Best for finding questions, long-tail keywords, and content ideas

Link: https://answerthepublic.com/

3. SpyFu

Competitor Keyword Research for Google Ads PPC & SEO at Best AISO.

SpyFu is a competitive intelligence and search analytics platform that helps marketers uncover their competitors' organic search (SEO) and paid advertising (PPC) strategies.

You can use the search bar on SpyFu's official website for free to look up domains or keywords and see top-level results.

Example keyword: ai visibility tools

The following metrics were helpful while working on the AI Visibility Tools post for Best AISO:

Top Keywords for Google Ads Buy Recommendations at Best AISO

Most Successful Advertisers and Their Best Ads for the respective keyword.

Top 10 Organic Ranking History | Brand Websites

Top 10 Organic Search Ranking Analysis with Rank difficulty score and other important metrics.

Paid plans start at just $33 per month. Learn more at SpyFu website.

Verdict:

SpyFu is useful for competitor research rather than generating a huge list of random keyword ideas. I use it to reverse-engineer competitors, identify keyword gaps, and analyze organic and paid search strategies. The free version is useful for quick research, but you can only see a limited amount of data compared with the paid plans.

Best for competitor keyword research and PPC insights

Link: https://www.spyfu.com/

4. Wordtracker

Find new keywords for your market at Best AISO.

WordTracker is a free keyword research tool that provides thousands of keywords for your market. You can use this free tool to reveal thousands of profitable long-tail keywords, with up to 10,000 results per search.

Example keyword: ai agents

I created a post about AI agent directories and was looking for keyword ideas when I discovered WordTracker.

Here are the top keywords for ai agents powered by Wordtracker at BestAISO.com!

I received a list of 99 keywords for "AI agents" with volume, competition and KEI.

Verdict:

If you're looking for a simple keyword research experience without the overwhelming complexity of a massive SEO platform, Wordtracker is a good starting point. It is useful for discovering related keywords and understanding keyword competition.

Best for beginners who want straightforward keyword research

Link: https://www.wordtracker.com/

5. Google Trends

Explore what your country is searching for right now at Best AISO.

I used Google Trends to explore the popularity of AI tools over time, in different locations, and in terms of their popularity on Google.

Example keyword: ai tools

The numbers represent the relative search interest for the given region and time, with 100 representing the peak popularity.

A value of 100 indicates peak popularity. A score of 50 indicates that the term is half as popular. A score of 0 indicates that there was insufficient data for this term.

See where your term was most popular during the specified time frame.

• Related Topics: These are topics that users searching for your term also searched for.

• Related Queries: Users searching for your term also searched for these queries.

Verdict:

I would use Google Trends when freshness and search momentum matter. It's great for identifying emerging topics, comparing keyword interest, and determining if a topic is gaining or losing attention.

However, I would not rely on it exclusively for comprehensive keyword research. It cannot replace a dedicated SEO keyword database when detailed difficulty and competitor data or a large list of keyword metrics are needed.

Best for finding keyword trends and comparing search interest over time

Link: https://trends.google.com/trends/

This is my curated list of best free SEO keyword research tools that I use and recommend.

Which free keyword research tool should you use?

I would choose based on what I need at that moment:

Tool	Best for	What I would use it for
SE Ranking	SEO metrics	Search volume, difficulty, intent, SERP research
AnswerThePublic	Content ideas	Questions, long-tail keywords, topic ideas
SpyFu	Competitor research	Competitor keywords, PPC, keyword gaps
Wordtracker	Beginner research	Related keywords and competition research
Google Trends	Trends	Growing topics, seasonality, keyword comparisons

Best AISO Keyword Research Workflow in 2026

Personally, I wouldn't rely on just one of these tools. I would combine them.

First, I would use Google Trends to see if the topic is growing or declining.

Then, I would use AnswerThePublic to find the questions that people are asking.

Next, I would use SE Ranking to check the search volume, keyword difficulty, user intent, and current SERP.

After that, I would use SpyFu to analyze competitors and identify keyword gaps.

Finally, I would use Wordtracker to discover additional related terms and long-tail opportunities.

This approach provides more than just a list of keywords.

It provides an understanding of:

What people search for, why they search for it, how competitive it is, what competitors are already ranking for, and whether interest is growing.

That is exactly what I want from keyword research in 2026.

Final Thoughts

AI has made content research much faster.

However, faster does not always mean better.

Before creating a page or a post, I want to know what people are searching for, what questions they have, which topics competitors are ranking for, and if there is real search demand for the topic.

That is why keyword research remains part of my workflow.

If you are just starting out, you don't need an expensive SEO platform.

Begin with these free tools, understand the strengths of each, and combine the data rather than relying on a single keyword score.

This will usually be enough to transform a basic content idea into a much more informed SEO strategy.

About Author: The SEO Keywords Finder

Suresh Chaudhary is an AI SEO expert and solo builder dedicated to helping businesses grow through AI-driven search engine optimization.

He is the founder, blogger and creator behind BestAISO.com, where he builds and shares practical strategies for modern blogging, AI search optimization, and the evolving world of search.

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2. https://bestaiso.com/seo-vocabulary

3. https://bestaiso.com/layers-of-seo-ai

4. https://bestaiso.com/seo-vs-aiso-guide

5. https://bestaiso.com/seo-tools-for-content-writing

6. https://bestaiso.com/content-types-for-geo-aeo-ai

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