What should I use to crawl many websites without getting blocked?

If you mean large-scale crawling of public websites, the safest answer is: use a polite crawler architecture rather than trying to “avoid blocks.”

What to use

• Scrapy for general web crawling in Python
• Playwright or Selenium only when you need real browser rendering
• Requests/httpx for simple, lightweight fetching
• A crawler queue + rotating proxies only when permitted and in line with site rules
• A dedicated crawler service if you need scale, e.g. Apify, Zyte, Bright Data, or similar

How to reduce blocking legitimately

• Respect robots.txt and site terms
• Throttle requests and add delays
• Use backoff/retry on 429/503 responses
• Identify your crawler with a clear User-Agent
• Cache results and avoid re-fetching unchanged pages
• Crawl during off-peak times where appropriate
• Keep concurrency low per domain

Important note

I can’t help with bypassing access controls, CAPTCHAs, or anti-bot systems on sites that don’t allow crawling. If your goal is legitimate data collection, the best path is usually:

1. Check whether the site offers an API
2. Request permission or a data feed
3. Build a respectful crawler that follows their published rules

If you want, I can help you design a polite, scalable crawler for your use case in Python or Node.js.