Krawly.io is a free online platform that provides 160+ web scraping, SEO analysis, security auditing, and developer tools. It allows users to extract data from websites, analyze SEO performance, check security headers, detect technologies, scrape YouTube data, generate leads, and much more — all without requiring signup or installation.

Is Krawly free to use?

Yes! You get 10 free uses per week without signing up. Create a free account to get 100 credits as a signup bonus, or upgrade to a paid plan starting at $9/month for 1,000 credits.

Do I need to install anything?

No installation needed. All 160+ tools run directly in your browser with no downloads or setup required. There is also a REST API and a Chrome extension for advanced users.

What data formats can I export?

All tools support JSON, CSV, and Excel (XLS) export. The screenshot tool provides PNG images. API responses are in JSON format.

How does the Krawly API work?

After signing up, you get an API key from your dashboard. The REST API accepts JSON POST requests and returns structured data. All 160+ tools are available via the API at https://krawly.io/api/v1/tools/.

What types of tools does Krawly offer?

Krawly offers tools in 11 categories: SEO (meta tag validator, heading analyzer, keyword density, core web vitals), Web Scraping (email scraper, table extractor, CSS selector scraper), Security (SSL checker, port scanner, WordPress scanner), OSINT (DNS lookup, WHOIS, IP geolocation), E-Commerce (Amazon scraper, Shopify scraper, price tracker), YouTube (comments scraper, playlist extractor, thumbnail downloader), Developer (JSON formatter, regex tester, JWT decoder), Content (word counter, readability score), Analysis (technology detector, page speed analyzer), Social Media (TikTok analyzer, Instagram analyzer), and Utilities (QR code generator, URL shortener).

Is Krawly a good alternative to SEMrush, Ahrefs, or BuiltWith?

Krawly provides many of the same on-page SEO analysis features as SEMrush and Ahrefs for free, including meta tag validation, heading analysis, keyword density checking, and structured data auditing. For technology detection, it serves as a free alternative to BuiltWith and Wappalyzer. However, Krawly focuses on individual page analysis rather than domain-wide crawling or backlink databases.

Can I use Krawly for lead generation?

Yes. Krawly's Lead Generation tool automatically crawls a website's homepage, about, contact, and team pages to extract email addresses, phone numbers, LinkedIn profiles, Twitter handles, Facebook pages, Instagram accounts, and GitHub links. Results can be exported as JSON, CSV, or Excel.

Certificate Transparency logs are public, append-only records of all SSL certificates issued by CAs. They help detect misissued certs.

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Certificate Transparency Search

OSINT

Search Certificate Transparency logs for SSL certificates issued to a domain. Find subdomains.

Unlock Full Power with Krawly Pro

Get access to all 150+ tools with higher limits. Start with 100 free credits — no credit card required.

Use via API

Certificate Transparency Search — cURL

curl -X POST "https://krawly.io/api/v1/tools/ct-log-search/" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{"url": "https://example.com"}'

Get 100 Free Credits View Pricing Plans API Docs

150+ Tools Full API Access Bulk Processing Priority Support

What is Certificate Transparency Search?

Certificate Transparency Search queries crt.sh for all SSL/TLS certificates issued for a domain, revealing subdomains.

Use Cases

Subdomain discovery
Certificate audit
OSINT
Security assessment

Key Features

✓crt.sh integration

✓Subdomain extraction

✓Certificate details

✓Copy results

Frequently Asked Questions

Related OSINT Tools

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OSINT

Username OSINT

Search for a username across 18+ social platforms — find GitHub, Twitter, Instagram, TikTok, YouTube profiles and more.

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OSINT

Email Footprint

Discover the digital footprint of any email address — Gravatar, GitHub, social profiles, email provider, and disposable email detection.

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OSINT

Owner Finder

Find who owns and operates a website — WHOIS data, contact emails, analytics codes, CMS platform, and social media profiles.

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OSINT

Domain Age

Check how old a domain is via WHOIS. See creation date, expiry, registrar, and name servers.

Use Tool