# The best website crawlers for SEO: desktop, cloud, and free tiers

You need a crawler to find technical issues, not to judge content. This guide shows what crawlers do, which tool fits your site, and how to run your first crawl. It is written for founders who ship their own sites.

Updated 2026-09-14 · Source: https://porteur.ai/guides/best-website-crawlers

## What a crawler finds and what it cannot

A crawler loads your pages like a bot and records the facts. It flags links, status codes, directives and metadata. You turn that into fixes.

- Finds: broken links and 404s, 301 and 302 chains, canonical tags, noindex and robots directives, titles and meta descriptions, headings, image alts, pagination tags, hreflang tags, click depth and internal links, duplicate URLs and near-duplicate titles or descriptions, sitemap references, response sizes and times.

- Does not do: content quality judgement, search intent, topical authority, backlink quality, real traffic. Use Search Console for clicks and queries, and GA4 for what users did after the click.

On a small site, this matters because one broken template can tank many pages. A crawler shows the pattern in one run. You then fix the template and retest.

## How to choose a crawler for your site

- Size of site: a desktop crawler covers most small SaaS and stores. Cloud makes sense when you have many tens of thousands of URLs or many people need access.
- Output style: raw tables you interpret, or explained hints with priorities and visuals.
- Jobs you need in one place: some suites include audits with rank tracking and keyword tools. That may be enough for a small team.
- Automation: do you need scheduling and API connections for regular checks.
- Collaboration: do you need sharing, comments and saved reports across a team.

Your choice is not final. You can run a desktop crawl today and keep a suite’s audit as a light monitor. Add cloud only when scale or team access forces it.

## Desktop crawlers: Screaming Frog and Sitebulb

Pick a desktop crawler if you run a small site and want speed and control on your machine.

- Screaming Frog SEO Spider: Windows, macOS and Linux. The free version crawls up to 500 URLs. The licence unlocks unlimited crawls, custom extraction, scheduling and API connections. It produces tables you interpret yourself.
- Sitebulb: Windows and macOS with a cloud version. Known for explained audit hints with priorities and visual crawl maps. Suits founders who want guidance on what to fix first.

Choose Screaming Frog when you want precise control and fast exports. Choose Sitebulb when you want the tool to guide you with hints and visuals. Both will find broken links, indexation directives, titles and canonical issues across your site.

## Cloud crawlers for larger sites

Use a cloud crawler when your site is large or when multiple people need to view the same crawl without sharing a laptop. Cloud helps with scheduling and trend views across many runs.

- Lumar: a cloud crawler for large sites. Built for teams that want monitoring, dashboards and alerts at scale.
- Oncrawl: a cloud crawler for large sites. Built for deep technical analysis and trend tracking across big crawls.

Choose cloud when your site or team size makes desktop awkward. For a product site under a few thousand URLs, desktop is usually faster to action and cheaper to run as of 2026.

## Suites with site audits: when they are enough

If you already use an SEO suite, start with its audit. It may be all you need for a small site. Suites also give you rank tracking and keyword research in one login.

- Ahrefs: known for its backlink index and Site Explorer. Also holds Keywords Explorer, Site Audit, Rank Tracker and Content Explorer. Domain Rating is its link-based score from 0 to 100. Ahrefs Webmaster Tools is free for verified sites.
- Semrush: a broad suite with Keyword Magic Tool, Position Tracking, Site Audit, Backlink Analytics and competitive research, plus advertising and content modules. Authority Score is its site metric.
- Moz Pro: holds Keyword Explorer, Link Explorer, Site Crawl, Rank Tracking and On-Page Grader. Domain Authority is Moz’s 0 to 100 score, relative and logarithmic. The MozBar browser extension is free.
- SE Ranking: covers rank tracking, website audit, keyword and competitive research, backlinks and on-page checks, with agency features. Often chosen as the affordable full suite.
- Ubersuggest: Neil Patel’s keyword research and site audit tool aimed at beginners, with a free tier. Its data is smaller than the large suites.

Choose a suite audit when you want one place to track rankings and fix common issues. Move to a dedicated crawler when you need deeper crawl control or team-scale trend analysis.

## Free tiers and free tools that help

- Screaming Frog SEO Spider: free for up to 500 URLs, enough for a first pass on many product sites.
- Ahrefs Webmaster Tools: free on verified sites. Use Site Audit and your own Site Explorer data.
- Google Search Console: free. Not a crawler you run, but the source of truth for your clicks, impressions and index coverage on your own site.
- Bing Webmaster Tools: free. Backlinks and keyword research, plus IndexNow.
- Ubersuggest: a free daily allowance across keyword ideas and site audit.

These do not replace a full crawl on a growing site. They do give you enough to find 404s, missing metadata and blocked pages before you spend on anything else as of 2026.

## A first crawl walkthrough on a small site

Here is how to run a clean first crawl on a small site using a desktop crawler. Use Screaming Frog’s free tier if you have fewer than 500 URLs.

1. **Scope the crawl** List your canonical domain, for example https://yourproduct.com. Decide if you will include subdomains like app.yourproduct.com. Keep the first run tight: the main site only.
2. **Check robots and sitemap** Open /robots.txt in a browser and confirm it allows crawling of the main sections. Find your XML sitemap URL and note it. If one is missing, plan to add it after the crawl.
3. **Run the crawl** Start the crawl at your homepage. Let it complete. Save the crawl file so you have a snapshot before you change anything.
4. **Find blockers first** Filter for noindex, disallow and canonical to other domains. Check status codes for 4xx and 5xx. On /pricing or /signup, these must be indexable and 200.
5. **Fix broken links** Export 404 inlinks. Update internal links to point to the current URL, for example change /blog/pricing-2023 to /blog/pricing.
6. **Tighten titles and descriptions** Export titles over about 60 characters and missing descriptions. Rewrite a long one on /guides/getting-started to fit and say the value.
7. **Check canonicals and duplicates** Group URLs with duplicate titles. Pick the right canonical on pairs like /features and /features/ to avoid split signals.
8. **Review click depth and internal links** Sort by click depth. Bring key pages like /pricing and /docs within two clicks from the homepage. Add links from /features and /guides.
9. **Re-crawl the changed URLs** Re-run a small crawl on affected sections. Confirm the 404 list is empty and the title changes are in place.

A fixed page looks like /pricing returning 200, indexable, with one canonical URL, a clear title under about 60 characters and links from your homepage and /features.

## Turn crawl data into a simple fix list

- Status and indexation: 5xx, 4xx, noindex or blocked by robots on important pages come first.
- Redirects: replace internal 301 hops with direct links. Clean long chains and loops.
- Canonical and duplicates: enforce one URL for each page. Remove near-duplicate pages or merge them.
- Titles and descriptions: write one line that matches search intent and fits the space. Use the title tag guide to keep under about 60 characters.
- Internal linking: reduce click depth for money pages. Add links from high-traffic pages to new ones.
- Sitemap and robots: ship an XML sitemap and allow crawling of public pages you want indexed.

Validate in Search Console. Check the Coverage and Performance reports for the affected pages over the next 28 days. Crawlers find issues. Search Console shows the outcome in impressions and clicks.

## Where crawlers fit alongside your other tools

Keep the roles clean. Crawlers find technical issues. Suites track rankings and competitors. Search Console shows your real queries and clicks. GA4 shows what users did after landing.

- Use a desktop crawler for hands-on fixes and exports.
- Use a suite audit if you already pay for the suite and need a light check with rank tracking.
- Use a cloud crawler when scale or team sharing becomes the bottleneck.
- Use PageSpeed tools for performance. They are not crawlers but they tell you how users experience your pages as of 2026.

If you need a one-off view of where to spend effort, a report like Porteur can read your site and rivals and point to the highest value fixes before you buy any tool.

## One rule when running crawls on live sites

> Throttle your crawl if your server is small. Avoid crawling during peak traffic. You want fast users and a full crawl, not timeouts.

## Questions

### Which SEO crawler should I use for a SaaS with under 1,000 URLs?

Use a desktop crawler. Screaming Frog’s free tier will likely cover your first pass. Sitebulb is a good pick if you want explained hints and a guided audit feel.

### Do I need a cloud crawler for my ecommerce store?

Only when your store runs into tens of thousands of URLs or multiple people need shared access and scheduling. For a smaller catalogue, desktop is faster to action.

### Are suite site audits as good as dedicated crawlers?

They are good enough for common issues on small sites and give you rank tracking and keywords too. Dedicated crawlers give you more control, exports and crawl depth when you need it.

### Will a crawler tell me why a page is not ranking?

It will show technical blockers and metadata gaps. It will not judge content quality or intent match. Pair the crawl with Search Console’s queries and clicks to see real demand.

### Can I find orphan pages with a crawler?

You can compare your crawl to your XML sitemap to spot URLs that exist but were not discovered in the crawl. Add internal links to surface them, or remove them if they should not exist.

### How often should I crawl my site?

After any release that changes templates or routing. Otherwise, a monthly crawl is a solid cadence for small sites. Increase frequency when you change your structure or migrate.

## Read next

- [Technical SEO checklist for a small site](https://porteur.ai/guides/technical-seo-checklist): Run these 20 technical SEO checks, in order. Each shows how to check it free and what fixed looks like for a site under 1,000 pages.
- [Sitebulb vs Screaming Frog: two desktop crawlers](https://porteur.ai/compare/sitebulb-vs-screaming-frog): Both crawl on your machine. Screaming Frog is the raw table, Sitebulb the explained audit. Here is who each suits, and what to run first.
- [Orphan pages: finding the pages nothing links to](https://porteur.ai/guides/orphan-pages): Find orphan pages on your site, why they happen, how to compare crawl, sitemap and Search Console, and what to do: link, merge, redirect or remove.
- [Internal linking for a small site: which pages link to which](https://porteur.ai/guides/internal-linking-for-seo): Decide which pages rank. Build hubs, write clear anchors, fix orphans, and crawl your site to map links you control.
- [Title tag length: what fits, what Google rewrites, and how to write one](https://porteur.ai/guides/title-tag-length): About 60 characters is a safe line. Learn pixels versus characters, why Google rewrites titles, and how to write titles that earn clicks.
- [robots.txt for AI crawlers: GPTBot, ClaudeBot, PerplexityBot and what to allow](https://porteur.ai/guides/robots-txt-for-ai-crawlers): Decide which AI crawlers to allow in robots.txt, why it matters, and copy‑paste examples for GPTBot, ClaudeBot, PerplexityBot, Google‑Extended and more.
- [The best SEO Chrome extensions: what each shows in one click](https://porteur.ai/guides/best-seo-chrome-extensions): The Chrome extensions that show titles, headings, canonicals, robots, schema and Web Vitals in one click, plus volumes on SERPs, and which two to install.
- [Web crawler](https://porteur.ai/glossary/web-crawler): A web crawler is software that fetches pages and follows links. Here is what that means for a small site, how to check access, and what to fix.

Paste your homepage URL and get a free check that reads your site and the rivals on your searches in about thirty seconds, with three findings shown in full. Free check: https://porteur.ai/