20 Best SEO Tools (Free and Paid)

1. Semrush

Semrush is a globally renowned digital marketing tool that provides integrated marketing and analytics services. Founded in 2008, it currently has over 10 million users, including major companies like Tesla and Procter & Gamble. Semrush's main features include keyword research, competitor analysis, website traffic monitoring, backlink analysis, SEO optimization, advertising research, and social media management. Additionally, it provides SEO content optimization tools to help users improve content quality and search engine performance. Semrush offers various paid plans to meet different user needs.

2. Ahrefs

Ahrefs is a powerful SEO and digital marketing tool focused on helping users improve website search engine rankings and visibility. Its core features include backlink analysis, keyword research, website auditing, content exploration, and competitor analysis. Ahrefs provides comprehensive SEO data, such as traffic estimates, keyword rankings, and backlink quality, helping users optimize content and develop effective SEO strategies. Additionally, Ahrefs has launched an AI content assistant to improve content quality and search engine rankings. Its massive database and user-friendly interface make it a preferred tool for SEO professionals.

3. Similarweb

SimilarWeb is a leading website traffic analysis tool focused on providing comprehensive website data and analytics services. It can help users understand website traffic sources, user behavior, competitor situations, and market trends.

4. Small SEO Tools

Small SEO Tools is a platform providing over 145 free online SEO tools aimed at helping users optimize website search engine performance. It covers multiple categories, including text analysis tools (such as plagiarism checker, article rewriter, spell checker, word counter, etc.), keyword tools (such as keyword research, density checker, competition analysis, etc.), backlink tools (such as external link checker, dead link detection, etc.), website management tools (such as website performance analysis, page speed testing, etc.), and image editing tools (such as image compression, size adjustment, etc.).

Additionally, Small SEO Tools also provides website tracking tools, proxy tools, domain tools, meta tag tools, password management tools, PDF tools, development tools, unit conversion tools, binary conversion tools, online calculators, etc. These tools require no download or installation, and users can use them simply by accessing the website through a browser.

5. SEO Review Tools

SEO Review Tools is a platform providing various free online SEO tools aimed at helping users quickly analyze website SEO performance and monitor competitor dynamics. These tools cover multiple SEO dimensions such as technical, content, and authority, and can generate detailed SEO insights and improvement suggestions.

1. Link Tools

2. Content Tools

3.3. Meta Information Checker

• Meta Length Checker by mrs.digital

Results displayed in Google Search after entering Meta information in code, using my blog Alignify as an example, checking if it will be truncated.

3. Keyword Tools

• Google Keyword Planner
• Google Trends
• Semrush Keyword Research
• Moz Keyword Explorer

1. AITDK

AITDK is an SEO extension made by independent developer Blank. For beginners, it can meet basic needs. You can view TDK (Title, Description, Keywords), Traffic (Similarweb metrics), SERP (number of indexed pages), Heading (H tags), Links (internal links and Attributes), Structured (structured data), etc.

These are the items I check most frequently.

2. Detailed SEO Extension

A veteran SEO extension with similar features to AITDK.

3. Wappalyzer – Technology Profiler

4. MozBar

5. Others

• SuperX – Twitter Analytics
• Hunter – Email Finder

1. Screaming Frog

Screaming Frog is an industry-leading website crawler tool developed by a UK SEO agency, widely used for technical SEO auditing. It can help users quickly crawl website pages, analyze website structure, content, and key elements, and identify common SEO issues such as broken links, duplicate pages, meta tag issues, etc.

Screaming Frog SEO Spider offers both free and paid versions. The free version can crawl up to 500 URLs, while the paid version (annual fee £199) has no limits and provides advanced features such as JavaScript rendering, custom data extraction, Google Analytics and Search Console integration, etc.

2. Xenu's Link Sleuth

Xenu's Link Sleuth is a powerful free website dead link detection tool, widely used to detect invalid links, broken links, and redirect links on websites. It supports comprehensive detection of local webpage files and online URLs and can generate detailed reports.

1. AirOps: LLM-Driven Content Generation Workflow

AirOps is a platform focused on leveraging AI technology to optimize content creation and SEO, aimed at helping businesses achieve scalable growth through precise content strategies and AI-driven workflows. It provides end-to-end solutions from content planning to distribution, supports multiple content types, and through expert guidance and team empowerment, helps businesses transform from AI users to AI builders, thereby improving content quality and business outcomes.

1. Social Media Management

• Buffer
• Hootsuite

2. Social Media Monitoring

• Awario
• Keyhole
• Brandmentions
• Brand24
• Social Searcher