- Who this crawler list is for: in-house SEO leads and agencies auditing large sites
- Ten crawlers and platforms side by side
- Oncrawl alternatives, A to Z
- Questions to answer before a trial crawl
- Check how each crawler reads robots.txt
- My advice on replacing Oncrawl
- Desktop or cloud: the trade-off
- Frequently asked questions
The best Oncrawl alternative for a large site is the one that crawls your biggest section cleanly, joins crawl data with logs and Search Console, and gives developers reports they'll act on. Decide between a desktop crawler and a cloud platform first, then run the same trial crawl in your top two and compare the results.
Big sites don't fail SEO audits in obvious ways. They fail in the long tail: a faceted filter that spawns a million URLs, a template that drops canonicals on one locale, a robots rule that blocks the wrong folder. An Oncrawl alternative has to find that, at scale, and explain it to the people who'll fix it.
Who this crawler list is for: in-house SEO leads and agencies auditing large sites
This is for in-house SEO leads at large sites and the agencies that audit them. If you're crawling a five-page brochure site, you don't need anything here. If you're dealing with hundreds of thousands of URLs, multiple templates and developers who want evidence before they change anything, read on.
Ten crawlers and platforms side by side
| Tool | Setup | Shortlist it if |
|---|---|---|
| Botify | Search visibility platform | Organic revenue is the board metric |
| JetOctopus | Crawl, logs and GSC platform | Crawl data and server files belong together |
| Lumar | Enterprise platform | Several teams share site health work |
| Netpeak Spider | SEO crawler | You audit often |
| Ryte | SEO platform | Usability sits in the same remit |
| Screaming Frog | Desktop crawler | You want full control of each crawl |
| Seobility | All-in-one platform | One person covers all of SEO |
| SEOmator | AI SEO assistant | You want tasks done, not just reports |
| Sitebulb | Desktop and cloud | You want both crawling options |
| Siteimprove | Content governance | Compliance and content teams join in |
Oncrawl alternatives, A to Z
Listed in no particular order. Each line paraphrases how the vendor describes its own tool.
Botify
Best for: Brands that want to be found wherever consumers, bots and agents search, and to drive organic revenue.
JetOctopus
Best for: Large sites that want crawl data, server logs, Search Console and GA4 in one place, plus AI bot tracking.
Lumar
Best for: Enterprise teams that want technical SEO, accessibility and site speed checks on one platform.
Netpeak Spider
Best for: SEOs and webmasters who want one tool for their day-to-day SEO tasks.
Ryte
Best for: Site owners who want to analyse, optimise and monitor a site, with usability alongside SEO traffic.
Screaming Frog
Best for: Technical SEOs who want a desktop crawler on Windows, macOS or Ubuntu for deep site audits.
Seobility
Best for: Site owners wanting an all-in-one SEO platform to improve Google rankings and visitors.
SEOmator
Best for: B2B SaaS teams that want an AI assistant to track keywords and prompts and carry out approved tasks.
Sitebulb
Best for: SEOs who want site audits with both desktop and cloud crawling options.
Siteimprove
Best for: Organisations that manage accessibility, analytics, SEO and content governance under one roof.
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Questions to answer before a trial crawl
- Can it crawl your biggest section in one run, and does that need cloud crawling or will a desktop machine cope?
- Does it join crawl data with server logs and Search Console, or will you be stitching exports together?
- How does it handle JavaScript rendering, and can you switch rendering on for only part of the site?
- Can you schedule crawls and get alerts when something changes between runs?
- Will developers and clients understand the reports without you sitting next to them?
Check how each crawler reads robots.txt
The Robots Exclusion Protocol is now written up as an IETF standard, RFC 9309, which is the reference for how crawlers should read robots.txt files. That matters for audits because your crawler should see the site the way search engine bots do. If it ignores a rule or reads it differently, your audit can flag pages Google never reaches, or miss pages it does.
During a trial, crawl a section you know has robots rules and compare what each tool reports as blocked. Also check whether you can tell the crawler to obey or override the rules on purpose, because you'll want both options when you're debugging.
My advice on replacing Oncrawl
Run the same crawl, on the same section, in your top two choices and compare the outputs line by line. The right tool is the one whose numbers match what you see in server logs and Search Console, and whose reports your developers act on without arguing. Everything else is a nice-to-have.
If AI bots are part of your audit, my guide to AI crawler user agents lists the names to look for in logs. For a quick read on a smaller site, try my free SEO audit, and if you're weighing up a wider SEO suite, see my alternatives to Ahrefs.
Desktop or cloud: the trade-off
Desktop crawlers give you full control and they're quick to set up, but a very large crawl ties up your machine and sharing results means exporting files. Cloud platforms run on someone else's servers, schedule crawls for you and make it easy for a whole team to see the same data, though you'll have less fine control over each run. Plenty of in-house leads keep one of each: a cloud platform for monitoring and a desktop crawler for the deep dives developers ask for.
Do you make an SEO crawler or technical audit platform? Tool makers can ask to be considered for a featured place on this list.
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Frequently asked questions
What's the biggest difference between Oncrawl alternatives?
Where the crawl runs and how much it joins together. Desktop crawlers give you control on your own machine, cloud platforms handle very large sites and scheduled crawls, and some join crawl data with logs and Search Console in one place.
Do I need a cloud crawler for a large site?
Not always, but it helps. A desktop crawler can handle big sites on a well-specified machine, while cloud tools take the load off your laptop and make it easier to schedule crawls and share results with a team.
Why does robots.txt handling matter in an audit?
The Robots Exclusion Protocol is set out in IETF RFC 9309. Your crawler should read robots.txt rules the way search engine bots do, or your audit may report pages that bots never see.
Which of these suit agencies?
Agencies usually want clear, shareable reports and the flexibility to crawl many client sites. Look at how each tool explains issues to non-specialists and how it handles multiple projects.
Is this list ranked?
No. The tools are listed A to Z in no particular order, with one line each based on the vendor's own description.
