Web Crawlers List: 10 Most Popular Bots & Spiders

The most common web crawlers are Googlebot, Bingbot, YandexBot, DuckDuckBot, Slurp, Baiduspider, facebookexternalhit, Applebot, Swiftbot, and SemrushBot. AI crawlers such as GPTBot, ClaudeBot, and PerplexityBot now show up in server logs too. Use the table below to match a user-agent token in your logs to its owner, then allow or block it in robots.txt.

Crawler	Operator	robots.txt Token	Main Purpose
Googlebot	Google	Googlebot	Google Search indexing
Bingbot	Microsoft	bingbot	Bing search indexing
YandexBot	Yandex	YandexBot	Yandex search indexing
DuckDuckBot	DuckDuckGo	DuckDuckBot	DuckDuckGo search
Slurp	Yahoo	Slurp	Yahoo content platforms
Baiduspider	Baidu	Baiduspider	Baidu search indexing
facebookexternalhit	Meta	facebookexternalhit	Link previews when a URL is shared
Applebot	Apple	Applebot	Siri and Spotlight suggestions
Swiftbot	Swiftype (Elastic)	Swiftbot	Site search indexing
SemrushBot	Semrush	SemrushBot	SEO and backlink data

The sections below cover the key features of each bot, followed by the AI crawlers you should know about and how to protect your site from malicious bots.

What Are Web Crawlers?

Web crawlers, also known as bots or spiders, are automated programs that systematically browse the internet to discover and index web pages. 

They play a crucial role in search engine operations, as they gather information from websites to create searchable indexes. 

Following links from one page to another helps these crawlers gather data and provide it to search engines, enabling users to find relevant content. 

How Does a Web Crawler Work?

A web crawler begins by starting at a seed, or a list of known URLs, and then systematically reviews and categorizes web pages. 

It discovers URLs, follows internal links, and collects content from websites. 

As it navigates through the web, the crawler indexes the gathered information and sends it to the database, enabling search engines to provide accurate and relevant results to users. 

This process allows you to understand how web crawlers systematically gather and organize data, ultimately influencing the search results that users encounter.

Top Web Crawlers List 

Here is the top 10 crawler list.

1. Googlebot

Googlebot is the powerhouse behind the world’s most popular search engine. 

As you browse the web, this tireless crawler is constantly at work, discovering new pages and updating existing ones to ensure your search results are always accurate and relevant.

When you’re managing your website, keep these key features of Googlebot in mind:

• Adaptive Crawl Rate: Googlebot sets its own crawl rate from your server’s response times, and your robots.txt file controls which paths it may visit.

• Search Console: Use Google Search Console to gain insights into how Googlebot navigates your site and improve your search visibility.

• URL Inspection: Google retired its public cached-page links in 2024, so use the URL Inspection tool in Search Console to see how Googlebot fetched and rendered a page.

• Efficient Crawling: Googlebot uses multi-threading and focused crawlers to gather information quickly and effectively.

• Specialized Bots: Google deploys various bots for specific purposes, including Googlebot Image, News, Video, and others like AdsBot and Feedfetcher.

• Monitoring Tools: Use server logs, Search Console data, sitemaps, and web analytics to track crawl frequency, indexing status, and identify potential issues.

Understanding these features can help you optimize your site for better visibility and performance in Google’s search results.

Suggested Read: How to Easily Add Google Search on WordPress Site

2. Bing Bot

BingBot is Microsoft’s powerful web crawler for the Bing search engine. Since 2010, this efficient bot has been discovering new web pages and updating existing ones, much like its Google counterpart. 

As you manage your website, keep these key BingBot features in mind:

• Crawl Control: Bing Webmaster Tools lets you adjust how fast BingBot crawls your site.

• Webmaster Control: Take advantage of Bing Webmaster Tool to manage how your website appears in search results.

• Continuous Discovery: BingBot keeps finding and re-crawling URLs, judging each one’s value for searchers.

• Smart Evaluation: During crawling, BingBot assesses your URL structure, length, complexity, and inbound link quality to predict content value.

• Bot Authentication: Protect your site from malicious imposters by using Bing’s bot verification tool to confirm genuine BingBot visits.

3. Yandex Bot

Yandex Bot is an efficient and fast web crawler powering Yandex, Eastern Europe’s popular search engine. 

Here’s what you need to know about Yandex Bot’s key features:

• Cyrillic Content Priority: Yandex Bot excels at recognizing and prioritizing Cyrillic script content, giving regional language material the attention it deserves.

• Enhanced Visibility Tools: Boost your Yandex presence by adding a “Yandex.Metrica” tag to your pages, using Yandex Webmaster tools for reindexing, or using the IndexNow protocol to highlight your new, updated, or removed pages.

• Bot Authentication: Protect your site by verifying genuine Yandex Bots. Check if the robot’s hostname ends with yandex.ru, yandex.net, or yandex.com to confirm its authenticity.

• Specialized Crawlers: Yandex deploys targeted bots for different content types. You’ll encounter YandexBot/3.0 for general web pages, YandexImages for visuals, YandexVideo for video content, and YandexDirect for optimizing online ads.

4. Duckduck Bot

DuckDuckBot is a privacy-focused web crawler. As you browse the internet, this bot diligently discovers new web pages and updates existing ones, all while prioritizing your privacy.

Here’s what you need to know about DuckDuckBot’s key features:

• Visit Verification: Use the DuckDuckBot API to check if this bot has visited your website, giving you insight into its crawling patterns.

• Comprehensive IP Database: Access one of the largest publicly available collections of DuckDuckBot IP addresses through the API, helping you understand its reach.

• Fraud Detection: DuckDuckBot continuously updates its API database with new IP addresses and user agents, empowering you to identify and block fake bots masquerading as DuckDuckBot.

• Respectful Crawling: You’ll appreciate that DuckDuckBot adheres to WWW: RobotRules and uses a variety of IP addresses, ensuring reliable and considerate crawling of your site.

Privacy and security go hand in hand, did you know you can secure your website easily? Here are the 6 Best WordPress Security Plugins you can consider.

5. Slurp Bot

Slurpbot is the diligent web crawler powering Yahoo Search. As you browse the web, Slurp strategically follows links to uncover fresh content, continuously refining and expanding Yahoo’s search results to enhance your online experience.

Here’s what you need to know about Slurp’s key features:

• Yahoo Platform Integration: Slurp gathers content from partner websites to populate platforms you use, like Yahoo News, Finance, and Sports, keeping you informed across various topics.

• Personalized Content Delivery: By verifying information from multiple sources, Slurp ensures you receive the most accurate and personalized content on Yahoo platforms.

• Smart Link Following: Slurp focuses on HREF attribute links, ignoring SRC attributes. This means you can control which content Slurp indexes by using the appropriate link types.

• Search Index Creation: As you link to other pages on your website, you’re helping Slurp discover and index new content, contributing to Yahoo’s comprehensive search index.

By understanding Slurp’s behavior, you can optimize your website for better visibility on Yahoo Search and its associated platforms.

6. Baidu Spider

The Baidu Spider is the powerful web crawler behind China’s most popular search engine. 

As you expand your online presence in the Chinese market, this bot efficiently discovers new web pages, with a special focus on Chinese language content.

Here’s what you need to know about Baidu Spider’s key features:

• Automatic Updates: Baidu Spider continually scans your site for fresh content. If you notice performance issues, you can easily adjust the crawling rate through your Baidu Webmaster Tools account.

• Crawl Management: Take control of how Baidu Spider interacts with your site using Baidu Webmaster Tools (Baidu Ziyuan). This platform allows you to analyze crawling issues and view the HTML content that Baidu has indexed.

• Activity Monitoring: Spot Baidu Spider’s presence on your site by looking for user agents like “baiduspider,” “baiduspider-image,” or “baiduspider-video” in your logs.

• Market Significance: Remember, Baidu is the largest search engine in mainland China. By optimizing for Baidu Spider, you’re tapping into a vast audience of Chinese internet users.

7. Facebook External Hit

Facebook External Hit is an intelligent web crawler that enhances your Facebook sharing experience. As you and others share links on the platform, this bot springs into action, gathering crucial information about the shared websites. 

By swiftly analyzing new web pages and updating existing data, Facebook External Hit ensures that your shared content is presented most engagingly and accurately as possible, ultimately improving your and other users’ experience on Facebook.

Here’s what you need to know about Facebook External Hit’s key features:

• Content Analysis: When you share a link, Facebook External Hit immediately analyzes the HTML of your website or app, ensuring accurate representation on the platform.

• Rich Link Previews: This bot fetches details like webpage titles and embedded video tags, allowing you to showcase your content more effectively when sharing links.

• Advertising Enhancement: Facebook External Hit works alongside Facebook to boost advertising performance, helping you reach your target audience more efficiently.

• Time-Sensitive Crawling: Be aware that if the crawl process isn’t completed quickly, your custom snippet may not display. Optimize your site’s load time to ensure the best possible preview of your shared content.

Recommended Read: 7 Best Facebook Plugins for WordPress [Live Feed, Reviews, & More]

8. Apple Bot

Apple’s web crawler has been diligently working since 2015. As you use the Apple ecosystem, this bot plays a crucial role in enhancing your experience across Apple’s suite of products and services, from Siri to Spotlight and beyond.

Here are some key features of Applebot:

• Siri and Spotlight Integration: When you use Siri or Spotlight Suggestions, you’re benefiting from Applebot’s indexing prowess.

• Smart Search Indexing: Applebot considers factors like user engagement, content relevance, external link quality, and your location to deliver the most appropriate search results.

• Advanced Rendering: Unlike some older crawlers, Applebot can process JavaScript and CSS, ensuring it sees your web pages just as you do.

• Googlebot Compatibility: If you’ve already optimized for Googlebot, you’re in luck. Applebot can understand and follow Googlebot instructions when specific Applebot directives aren’t available.

Understanding these features can help you optimize your website for better visibility within Apple’s ecosystem, ensuring your content is easily discoverable through Siri, Spotlight, and other Apple services. 

When you cater to Applebot, you’re enhancing your reach to millions of Apple users worldwide.

9. Swift Bot

Next up in our list of crawlers is Swift Bot. It is the crawler behind Swiftype, a site search product that Elastic acquired in 2017 and now treats as a legacy product, so you will mostly see it on older sites.

Here’s what sets Swift Bot apart:

• Customized Indexing: With Swiftype, you can easily catalog and index all pages of your website, especially beneficial if you manage a large site.

• Targeted Crawling: Unlike most web crawlers, Swift Bot only crawls websites upon your specific request, giving you full control over what content gets indexed.

• User-Friendly Setup: You’ll find Swift Bot’s indexing process straightforward and less technically demanding than using the Swiftype API, allowing you to set up site searches quickly and easily.

• Google-Like Efficiency: Swift Bot collects and indexes data from your website similarly to Google, ensuring comprehensive coverage of your content.

By focusing on these features, you can optimize your website’s searchability and provide a more tailored search experience for your users. 

With Swift Bot, you’re in control of what gets crawled and indexed, allowing for a more customized approach to site search.

10. SEMrushBot

In the list of web crawlers, SEMrushBot is the final one here, used by none other than SEMrush, a popular SEO tool.

It crawls the web to gather information about websites and their content, which is used to provide insights and recommendations to SEMrush users.

Here are some key Features of SEMRush Bot:

• Multi-Purpose Data Collection: Use Semrushbot’s insights for backlink research, on-page SEO audits, keyword research, link building, brand monitoring, and content creation.

• Backlink Analysis: Evaluate your website’s backlink profile quality and quantity, identifying opportunities to boost your online presence and attract more traffic.

• Organic Traffic Insights: Uncover the keywords driving visitors to your site, allowing you to optimize content and climb search engine rankings.

• Competitive Edge: Analyze your competitors’ data to develop strategies that will help you outrank them in search results.

• Goal-Oriented Optimization: Use Semrushbot’s collected data to enhance your SEO efforts and achieve your digital marketing objectives.

Recommended Read: 5 Best Free SEO Plugins for WordPress

AI Web Crawlers You Will See in Your Logs

Search crawlers index pages for search results. AI crawlers do something different, and several companies now publish separate bots for training, search, and user-requested fetches. Each one is controlled by its own robots.txt token, so you can allow one and block another.

Crawler	Operator	What It Does
GPTBot	OpenAI	Crawls content that may be used to train generative AI models
OAI-SearchBot	OpenAI	Surfaces websites in ChatGPT search results
ChatGPT-User	OpenAI	Fetches a page when a ChatGPT user asks about it; robots.txt rules may not apply
ClaudeBot	Anthropic	Collects web content that could contribute to model training
Claude-SearchBot	Anthropic	Improves the quality of Claude search results
Claude-User	Anthropic	Fetches pages when a Claude user asks a question
PerplexityBot	Perplexity	Surfaces and links sites in Perplexity search; not used for AI model training
Perplexity-User	Perplexity	Fetches pages for user questions and generally ignores robots.txt rules

OpenAI states that each setting is independent, so you can allow OAI-SearchBot to appear in ChatGPT search while disallowing GPTBot to keep your content out of model training. To block a training crawler from your whole site, add this to robots.txt:

User-agent: GPTBot
Disallow: /

User-agent: ClaudeBot
Disallow: /

This list follows the crawler documentation published by OpenAI, Anthropic, and Perplexity. Bots change, so check each company’s page before editing robots.txt.

How to Protect Your Site From Malicious Web Crawlers?

To protect your site from malicious web crawlers, here are a few handy techniques:

1. Optimize Robots.txt

The Robots.txt file allows you to specify which parts of your site crawlers can access. Use it to block suspicious user agents and restrict access to sensitive areas of your website.

2. Strengthen Authentication

Employ strong authentication measures. Implement CAPTCHA systems and login requirements to prevent unauthorized bots from accessing protected content.

Related Read: CAPTCHA vs reCAPTCHA Compared [8 Key Differences]

3. Monitor Traffic

Monitor your site’s traffic regularly. Use analytics tools to identify unusual crawling patterns or spikes in bot activity. 

If you spot suspicious behavior, investigate and take action promptly.

4. Deploy Web Application Firewall

Consider using a web application firewall (WAF). This tool can help you filter out malicious traffic and protect against common attack vectors.

5. Keep Software Updated

Regularly update your content management system (CMS) and plugins. Outdated software can be vulnerable to exploitation by malicious crawlers.

6. Implement Rate Limiting

Rate limiting on your server will prevents bots from overwhelming your site with requests, ensuring legitimate users can access your content.

7. Set Honeypot Traps

Use honeypot traps to catch bad bots. Create hidden links that only a bot would follow, then block any visitors to these fake pages.

Implementing these strategies will significantly enhance your site’s security against malicious web crawlers while still allowing beneficial bots to index your content.

Wrapping Up

As we’ve covered the top 10 web crawlers, you’ve gained valuable insights into how these digital explorers shape the internet. 

From industry giants like Googlebot and Bing Bot to specialized crawlers like Baidu Spider and SEMrushBot, each plays a crucial role in indexing and organizing the vast expanse of online content.

While these bots are essential for discoverability, it’s equally important to protect your site from malicious crawlers through the methods mentioned above.

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FAQs on Web Crawlers List