Website Contact Extractor
Emails, phone numbers and social profiles from company websites, with the page each one was found on.
RapidAPI: free 50 requests/month; $14.99/month for 10,000 requests
Web data tools for developers and AI agents
43 tools that turn websites, documents, audio and images into clean data. Run them in bulk on Apify; selected tools also have a RapidAPI endpoint.
Free AI crawler checker
Is your site blocking ChatGPT, Claude or Perplexity? See which of 29 AI crawlers (GPTBot, ClaudeBot, PerplexityBot and more) a site's robots.txt allows, with a ready-to-paste fix. Free JSON API, no sign-up, no key:
https://tools.yukai.uk/ai-crawlers/<domain> — try /ai-crawlers/wikipedia.org
Also try our free AI visibility checker (one sample answer per day). Also free for AI agents: https://tools.yukai.uk/md/<url>, a web page or PDF as clean Markdown (how to use it). Machine-readable catalog: /llms.txt
Featured APIs
Call these tools from your code, with a free tier and paid plans on RapidAPI.
Image OCR API
Text from receipts, documents, screenshots and photos in many languages.
RapidAPI: free 50 requests/month; $9.99/month for 2,000 requests
AI Web Data Extractor API
Read public pages only, respect robots.txt, and reject blocked or empty pages before calling AI. Get the fields you name as structured JSON, one row per item on list pages.
RapidAPI: free 50 requests/month; $19.99/month for 500 requests
Turn web pages and documents into clean text for AI and apps
Crawl a docs site into Markdown for RAG, pull the article out of a news page, render screenshots and PDFs, or turn a page into JSON fields you name.
- Website to Markdown
- Smart Fetch (URL to Markdown by region)
- Article extractor & AI summarizer
- Screenshots, PDFs and Markdown
- Documents to Markdown
- AI web data extractor
- and 5 more
Audit, check and monitor websites
Score a page in about two seconds, audit a whole site, see which AI crawlers a site blocks, and get alerted when a page changes.
- SEO audit
- AI crawler access checker
- Regional price checker
- Domain authority checker
- Website traffic rank checker
- Backlink gap finder
- and 6 more
Enrich companies, contacts and domains
Start from a domain or a list of websites and get the company profile, the tools it uses, public contact details and the state of its domain.
- Website contact extractor
- Company enrichment
- Tech stack detector
- Domain WHOIS, RDAP & DNS lookup
- Email validation
- Phone number validator
- and 4 more
Collect jobs, app store and online store data
Read official feeds and public pages into one consistent table: career-site jobs, app reviews and rankings, store catalogues and newsletter posts.
- Career site jobs
- Job search across 54,000 career sites
- App Store reviews & app details
- App Store top charts & keyword ranks
- Shopify products & prices
- Newsletter & blog feeds
Transcribe audio and read or edit images
Speech to text with timestamps and SRT subtitles, text from receipts and screenshots, alt text for accessibility, and bulk image clean-up.
- Audio & video transcriber
- Image to text (OCR)
- AI alt text generator
- Background removal & image tools
Guides and how-tos: 9 short answers with steps and prices →
Free data
Open datasets we publish with one page per site, company or service. Counts and dates below are today's.
AI Crawler Index
Which popular websites block GPTBot, ClaudeBot, PerplexityBot and other AI crawlers in robots.txt, checked every day.
10,000 websites · 29 AI crawlers, 8,317 readable robots.txt files · data of 2026-11-14
Tech Stack Index
What popular websites are built with: CMS, framework, CDN, analytics and more, from public home pages and response headers.
7,718 websites · 394 technologies detected · data of 2026-11-14
Hiring Index
Which companies are hiring now, by role family and country, counted from public job boards of 16 applicant tracking systems.
1,681,854 open jobs · 44,285 companies · data of 2026-11-14
Regional Price Index
What software and subscriptions cost in the US, UK, Singapore and Taiwan, read from each pricing page in that country.
148 services · 4 regions · data of 2026-11-14
Business Lists by City
How many businesses of each kind a city has and how many list a website, from Overture Maps.
2,050,445 businesses · 150 cities, 40 categories · data of 2026-10-03
Funding Tracker
Which companies just raised money, by industry and US state, from the new Form D filings at the SEC, updated daily.
1,386 Form D filings · last 30 days, 31 industries, 51 states · data of 2026-11-13
Direct, Apify or RapidAPI?
Apify: bulk jobs, no code
Paste a list of URLs or domains, run it once or on a schedule, and download a table. You pay per result at the price shown; larger Apify plans pay less. Works from n8n, Make, Zapier and AI agents through Apify's MCP server.
RapidAPI: one HTTP call per item
Call the API from your own code with one key. Every API has a free plan with a hard monthly limit and paid monthly plans; RapidAPI handles sign-up and billing.