Screaming Frog SEO Spider
The Screaming Frog SEO Spider is a website crawler that helps you improve onsite SEO, by extracting data & auditing for common SEO issues. Download & crawl 500 URLs for free, or buy a license to remove the limit & access advanced features. The SEO Spider is a powerful and flexible site crawler, able to crawl both small and very large websites efficiently while allowing you to analyze the results in real-time. It gathers key onsite data to allow SEOs to make informed decisions. Crawl a website instantly and find broken links (404s) and server errors. Bulk export the errors and source URLs to fix, or send to a developer. Find temporary and permanent redirects, identify redirect chains and loops, or upload a list of URLs to audit in a site migration. Analyze page titles and meta descriptions during a crawl and identify those that are too long, short, missing, or duplicated across your site.
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Crawl4AI
Crawl4AI is an open source web crawler and scraper designed for large language models, AI agents, and data pipelines. It generates clean Markdown suitable for retrieval-augmented generation (RAG) pipelines or direct ingestion into LLMs, performs structured extraction using CSS, XPath, or LLM-based methods, and offers advanced browser control with features like hooks, proxies, stealth modes, and session reuse. The platform emphasizes high performance through parallel crawling and chunk-based extraction, aiming for real-time applications. Crawl4AI is fully open source, providing free access without forced API keys or paywalls, and is highly configurable to meet diverse data extraction needs. Its core philosophies include democratizing data by being free to use, transparent, and configurable, and being LLM-friendly by providing minimally processed, well-structured text, images, and metadata for easy consumption by AI models.
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Semantic Juice
Use capabilities of our web crawler for topical and general web page discovery, open or site specific crawl with powerful domain, URL, and anchor text level rules. Get relevant content from the web, discover new big sites in your niche. Use API for integration with your project. Our crawler is tuned to find topical pages from small set of examples, avoid various spider traps and spam sites, crawl more often more relevant and more topically popular domains, etc. You can define topics, domains, url paths, regular expression, crawling intervals, general, seed, and news crawling modes. Built-in features make our crawlers more efficient as they ignore near duplicate content, spam pages, link farms, and have a real time domain relevancy algoritm which gets you the most relevant content for your topic.
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WebCrawlerAPI
WebCrawlerAPI is a powerful tool for developers looking to simplify web crawling and data extraction. It provides an easy-to-use API for retrieving content from websites in formats like text, HTML, or Markdown, making it ideal for training AI models or other data-intensive tasks. With a 90% success rate and an average crawling time of 7.3 seconds, the API handles challenges like internal link management, duplicate removal, JS rendering, anti-bot mechanisms, and large-scale data storage. It offers seamless integration with multiple programming languages, including Node.js, Python, PHP, and .NET, allowing developers to get started with just a few lines of code. Additionally, WebCrawlerAPI automates data cleaning, ensuring high-quality output for further processing. Converting HTML to clean text or Markdown requires complex parsing rules. Handling multiple crawlers across different servers.
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