20 Best SEO Tools Compared: How to Choose Free and Paid Tools by Purpose

There are so many SEO tools that plenty of people struggle with "which one should I actually choose." And because each tool is good at a different area, choosing without organizing your goals often leads to "paying money for something you never use." This article organizes the types of SEO tools and how to choose them, then introduces 20 recommended free and paid tools by purpose.

What Is an SEO Tool?

An SEO tool is a tool that visualizes and streamlines the work needed to rank highly in search engines (keyword research, rank tracking, competitor analysis, internal audits, and so on). SEO is hard to win on instinct alone; the more competitive the keyword, the more analysis and improvement based on data becomes a prerequisite.

The 5 Types of SEO Tools

SEO tools can be broadly divided into the following 5 types by role. First, use this classification to identify the type you need.

• Keyword research type: uncovers search volume, related keywords, and search intent
• Rank tracking type: continuously measures the ranking trends of targeted keywords
• Competitor analysis type: investigates competitors' traffic keywords, backlinks, and top-ranking trends
• Internal audit (technical SEO) type: detects technical issues such as crawl errors and page speed
• Integrated (all-in-one) type: can perform the above functions together (common among paid tools)

10 Recommended Free SEO Tools

First, the free tools you can start with at no cost. Google's official tools in particular are essential.

1. Google Search Console

A free official Google tool that lets you grasp the reality of your search traffic (search queries, impressions, clicks, rankings). It also handles index status and error detection, making it the starting point for all SEO.

2. Google Analytics (GA4)

A free official Google analytics tool that lets you analyze the traffic paths, behavior, and conversions of users who visit your site. It is indispensable for measuring SEO results.

3. Google Keyword Planner

A tool for researching search volume and related keywords. It is originally intended for Google Ads, but is widely used in SEO as well as foundational data for keyword selection.

4. Rakko Keyword

A Japanese tool that can extract large numbers of suggest keywords and related terms. It is fully usable even for free, and helps with finding content themes and understanding search intent.

5. Ubersuggest

A tool covering keyword research, competitor analysis, and content suggestions. The free version limits the number of uses, but it suits beginners getting a grasp of the big picture.

6. Microsoft Clarity

A free Microsoft tool that visualizes user behavior with heatmaps and session recordings. It helps with page improvement and finding UX bottlenecks.

7. PageSpeed Insights

A free official Google tool that measures page loading speed and Core Web Vitals. It also presents improvement points, serving as an entry point to technical SEO.

8. Google Trends

A free tool for grasping trends in keyword search demand and seasonal patterns. You can use it to spot growing themes and plan content.

9. Suggest-based tools such as keysearch and aramakij

A group of free tools that can easily extract suggest keywords. Used alongside Rakko Keyword, they let you uncover keywords from multiple angles.

10. Lighthouse (browser extension / developer tool)

A free tool that diagnoses page performance, accessibility, and basic SEO items. Built into Chrome, it streamlines everyday checks.

10 Recommended Paid SEO Tools

For serious operation such as competitor analysis and large-scale rank tracking, paid tools become necessary. Choose according to your purpose.

11. Ahrefs

An all-in-one tool with a strong reputation for backlink analysis and competitor research. You can grasp competitors' traffic keywords and backlinks in detail, and features for viewing citation status in AI search have also emerged.

12. Semrush

A globally used integrated tool that broadly covers keywords, competitors, and advertising. It also has features to measure visibility in AI search, and suits large-scale, multilingual analysis.

13. Moz Pro

A tool known for metrics such as Domain Authority (DA). It performs backlink analysis and site audits, with strengths in English-language SEO.

14. Mieruca SEO

A Japanese tool with strengths in content SEO. It offers search-intent analysis, article outline support, and content creation support features using generative AI.

15. Nobilista

A cloud-based rank tracking tool. With no installation required, it measures rankings automatically 365 days a year, and suits sharing rankings across a team.

16. GRC

A long-standing, standard rank checking tool. It is simple and inexpensive, with the ability to record the rankings of large numbers of keywords daily.

17. Rank Tracker

A desktop-based rank tracking tool. It can track large numbers of keywords at once and also includes keyword research features.

18. Pascal

A Japanese tool that presents content improvement hints from comparisons with top-ranking sites. It is useful for the practical work of internal measures and content SEO.

19. TACT SEO

A Japanese tool that supports keyword analysis and the identification of internal-measure issues. It makes it easy to organize content improvement priorities and is also easy for beginner SEO teams to use.

20. Screaming Frog SEO Spider

A standard technical-SEO tool that crawls your site and extracts internal links, title and meta information, and errors all at once. For small sites, it can be used for free.

How to Use Free and Paid Tools

Rather than picking "one multifunctional tool," the basic approach is to choose according to your purpose and phase.

• Just starting SEO / individual / small scale → Google's free official tools (Search Console, GA4, Keyword Planner) and Rakko Keyword are enough to start.
• Want to track rankings continuously → Introduce a rank checking tool such as Nobilista or GRC.
• Want to analyze competitors in earnest → Consider an all-in-one type such as Ahrefs or Semrush.
• Want to streamline content creation → Make use of a content-support type such as Mieruca SEO or Pascal.

Many companies commonly build on free official Google tools and combine two or three paid tools costing several thousand to several tens of thousands of yen per month. Grasping your current situation and issues with free tools first, then supplementing the features you come to need with paid tools, is an efficient way to proceed.

Points for Choosing an SEO Tool

• Does it have features that match your purpose: prioritize whether it has features that solve your issues, over sheer multifunctionality
• Balance of price and operation scale: don't pay a high price for features you won't use
• Availability of a free trial: before adopting, try multiple tools and compare their usability
• Support and Japanese-language compatibility: for beginners, the support structure of a domestic tool also matters

Summary

The right way to choose an SEO tool is not "which is the best" but "which fits your purpose and phase." By first building a foundation with Google's free official tools and adding paid tools for rank tracking, competitor analysis, and content support as needed, you can build an SEO setup that keeps costs down while leading to results.