Common CrawlMost Popular

Nonprofit open web archive with 9.5 PB of data – the foundational dataset behind 64% of major LLMs including GPT-3.

By Nathan KesslerUpdated May 8, 2026

Each tool is evaluated against our methodology using public docs, vendor demos, and hands-on testing.

Independent web indexes maintain their own crawl of the web, separate from Google or Bing. This independence is valuable for AI applications that need unbiased search results, want to avoid rate limits on commercial search engines, or need specialized coverage. Several of these indexes are open source, allowing full transparency into how results are ranked.

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Features

—JS Rendering

✓Structured Output

✓Open Source

✓Self-Hosted Option

Pricing:Free

Editorial assessment

The bedrock of the modern AI era – 80%+ of GPT-3's training tokens came from Common Crawl. 9.5 PB of freely available web data, 2.4B pages crawled monthly. Not an API you query for search results. This is a massive archive you download and process yourself, requiring significant compute infrastructure. Free in cost, expensive in engineering.