"Web crawler" covers three quite different tools: frameworks that developers build data pipelines on, desktop apps that audit a site for SEO, and no-code point-and-click extractors. Picking the wrong category wastes weeks. This comparison sorts the main options by what they are genuinely for, and covers the one requirement they all share at scale — IP rotation.
First, the distinction that matters: crawling is discovering and walking URLs; scraping is extracting fields from the pages you land on. Most real projects do both — see web crawling vs web scraping.
Developer Frameworks
Scrapy (Python)
The default choice for serious Python crawling. Scrapy is a full asynchronous framework with built-in scheduling, deduplication, retries, item pipelines, and middleware — including proxy middleware. Steeper to learn than plain requests, but it handles the concurrency and politeness logic you would otherwise write yourself. Best for large structured crawls. See our Scrapy tutorial.
Crawlee (Node.js and Python)
A modern framework that treats headless browsers as a first-class option — it can switch between plain HTTP and a real browser per request, with built-in request queues, retries, and session/proxy rotation. A strong pick when a meaningful share of your targets are JavaScript-rendered.
Colly (Go)
A fast, lightweight crawling framework for Go. Very high throughput and low memory per request, with a simple callback API. Best when raw speed matters and pages are server-rendered; no built-in JavaScript rendering.
Browser Automation
Playwright and Puppeteer
Not crawlers in themselves — they drive a real Chromium, Firefox, or WebKit browser. You add the crawl logic. Use them when content only exists after JavaScript runs, or when the target fingerprints clients. Slower and heavier per page than HTTP crawling, so most teams use them selectively rather than for an entire crawl. See Playwright for web scraping and Puppeteer vs Playwright vs Selenium.
Large-Scale and Archival
Apache Nutch (Java)
A mature, distributed crawler built to run on Hadoop for web-scale jobs — the kind of tool behind search indexes. Heavy operational overhead; only worth it when you genuinely need distributed crawling across many machines.
Heritrix (Java)
The Internet Archive's crawler, designed for archival fidelity: capturing pages faithfully to WARC files rather than extracting fields. Choose it for preservation and compliance archiving, not for structured data extraction.
SEO Site Crawlers
Screaming Frog SEO Spider
A desktop crawler built for site audits — broken links, redirect chains, duplicate titles, meta descriptions, status codes, and sitemap generation. It crawls one site deeply rather than harvesting data across the web. There is a free tier with a URL cap and a paid licence for unlimited crawling.
Sitebulb
Also SEO-focused, with stronger visualisation and prioritised audit recommendations. Similar remit to Screaming Frog with a different reporting emphasis.
No-Code Extractors
Tools such as Octoparse and ParseHub let you build extractors by clicking elements in a visual editor, with cloud scheduling. Good for non-developers and small recurring jobs; they hit limits on complex logic, heavy anti-bot targets, and very large volumes. Most offer a limited free tier with paid plans above it.
At a Glance
| Tool | Type | Language | JS rendering | Best for |
|---|---|---|---|---|
| Scrapy | Framework | Python | Add-on | Large structured crawls |
| Crawlee | Framework | Node / Python | Built in | Mixed static + JS targets |
| Colly | Framework | Go | No | Maximum throughput |
| Playwright | Browser automation | Multi | Yes | JS-heavy, protected sites |
| Apache Nutch | Distributed crawler | Java | Limited | Web-scale, multi-machine |
| Heritrix | Archival crawler | Java | Limited | Preservation / WARC |
| Screaming Frog | SEO desktop | — | Optional | Site audits |
| Octoparse / ParseHub | No-code | — | Yes | Non-developers, small jobs |
Feature sets and pricing change — confirm current details on each vendor's site before committing.
How to Choose
- Auditing your own site? Screaming Frog or Sitebulb. Nothing else is aimed at this.
- Python team, large structured crawl? Scrapy.
- Lots of JavaScript-rendered targets? Crawlee, or Playwright with your own crawl loop.
- Throughput above all, static pages? Colly.
- Archiving for compliance? Heritrix.
- No developers available? A no-code tool, accepting the ceiling.
- Genuinely web-scale across a cluster? Nutch — and be sure you need it.
The Requirement They All Share
Every tool above sends many requests from one machine, and that is exactly the pattern rate limiters exist to stop. Whichever you pick, at scale you need rotating residential proxies so requests exit from many real IPs rather than one. Scrapy, Crawlee and Colly all accept proxy configuration directly; Playwright takes a proxy at browser launch; most no-code tools have a proxy field in settings.
Two practical notes: prefer residential over datacenter IPs on strict targets (why), and pair rotation with sane concurrency and delays — proxies stop you being blocked, they do not make hammering a site acceptable.
Frequently Asked Questions
What is the best web crawler?
There is no single best one because they solve different problems. Scrapy is the strongest general-purpose framework for large Python crawls, Crawlee is better when targets are JavaScript-heavy, Colly wins on raw throughput in Go, and Screaming Frog is the right tool for auditing your own site. Pick by job, not by popularity.
What is the difference between a web crawler and a web scraper?
Crawling is discovering and walking URLs across a site or the web; scraping is extracting specific fields from the pages you reach. Most real projects combine the two: crawl listing pages to collect links, then scrape each detail page for data.
Do web crawlers need proxies?
At any meaningful scale, yes. A crawler sends far more requests than a human, all from one IP, which triggers rate limits and bans quickly. Rotating residential proxies spread requests across many real IPs so the crawl can finish, and let you raise concurrency without immediately tripping defences.
Is Scrapy better than Playwright?
They do different jobs. Scrapy is a crawling framework that fetches pages over HTTP very efficiently but does not run JavaScript by default. Playwright drives a real browser so it sees JavaScript-rendered content, but is much heavier per page. Many teams use Scrapy for the bulk of a crawl and a browser only for the pages that need it.
Conclusion
Match the tool to the task: SEO crawlers for site audits, Scrapy or Colly for high-volume structured crawls, Crawlee or Playwright when JavaScript is involved, Heritrix for archiving, no-code when there is no developer. Then solve the problem all of them share — run the crawl through rotating residential IPs, at a polite pace, and it will actually finish.
Make any crawler survive at scale: SpyderProxy residential proxies from $2.75/GB — rotating IPs across 195+ countries, HTTP(S) and SOCKS5, works with every tool on this list.