How to choose a technical SEO crawler

A technical SEO crawler simulates how a search-engine bot moves through your site — following links, reading robots rules, checking canonicals and redirects — and reports what it finds broken. Every tool in this category does that core job. What separates a $279-a-year desktop licence from a quote-only enterprise platform is scale, automation, and whether the tool also reads your actual server logs to show what Googlebot really crawled, versus what a simulated crawl found.

You need a dedicated crawler if you manage a site large enough, or complex enough, that manual link-checking or a generic audit tool misses real problems: faceted navigation, JavaScript-rendered pages, multi-million-URL catalogs, or a history of indexing issues you can't diagnose from Search Console alone. A small brochure site with a few dozen pages rarely needs more than what's built into a general SEO platform's audit module.

Desktop licence or hosted platform

Screaming Frog SEO Spider runs locally on your machine, stores crawl data on disk, and is sold as an annual per-user licence rather than a subscription — which means no row-count ceiling tied to a monthly plan, at the cost of using your own machine's memory for very large crawls. Sitebulb offers both a desktop version and a hosted Sitebulb Cloud option, letting a team choose per project. Every other tool here — Botify, Conductor, JetOctopus, Lumar, Oncrawl — is a cloud platform only, built for scheduled, recurring crawls rather than a one-off audit run from a laptop.

Whether you need log-file analysis, not just a simulated crawl

A crawl tells you what a bot could find; a log file tells you what it actually did visit, and how often. Botify, JetOctopus and Oncrawl are built specifically to cross-reference the two, which matters most on large sites where crawl budget is a real constraint — an e-commerce catalog or publisher with millions of URLs, where you need to know which pages Googlebot is actually spending time on versus which ones it's ignoring. Lumar adds this as one module among several (SEO, QA, accessibility, and AI-crawler tracking) rather than as its central focus. Screaming Frog and Sitebulb do not offer native log-file analysis at this depth; on a smaller site, Search Console's own crawl-stats report is often enough to substitute.

Scale: audit tool versus enterprise operations platform

Screaming Frog and Sitebulb are priced and built for an individual practitioner or small agency running periodic audits. Botify, Conductor and Lumar are priced entirely on custom, quote-based contracts and built for organizations with a dedicated SEO engineering function running continuous monitoring across many millions of URLs — the kind of buyer who needs role-based access, API integration into a BI stack, and dedicated onboarding, not just a report. JetOctopus sits between the two: self-serve published pricing by crawl and log-line volume, aimed at mid-market and agency teams that want log-file depth without an enterprise sales process.

What else gets bundled in

Lumar (formerly DeepCrawl) extends past SEO into site-wide QA testing, WCAG accessibility auditing, and page-speed monitoring in the same crawl engine — useful if your team owns more than SEO. Conductor leans the other way, pairing its crawl-and-monitoring capability with keyword intelligence, an AI writing assistant, and AI-answer-engine citation tracking, positioning itself as much for content strategy as for technical auditing. If your need is strictly "find and fix crawl errors," these extras are either a convenience or unused weight, depending on who else on your team would use them.

How pricing scales

The desktop tools are the exception to quote-based pricing: Screaming Frog publishes a flat per-licence annual price with volume discounts, and it also offers a free mode capped at 500 URLs per crawl, enough to evaluate the interface before buying. Every cloud platform here scales by monthly crawl-URL volume and, where log analysis is included, by log-line volume — confirm what happens to that allowance during a traffic spike or a site migration, when crawl and log volume both jump temporarily.

A shortlist by situation

• You want a deep, one-off technical audit without an ongoing subscription. Screaming Frog, especially if you're comfortable with a data-table-first interface.
• You need to present findings to non-technical stakeholders. Sitebulb's visual, prioritized "Hints" are built for this.
• You manage a multi-million-URL site and need crawl data cross-referenced with real bot logs. Oncrawl or Botify, depending on budget and whether you want Botify's more extensive enterprise onboarding.
• You want log-file analysis without full enterprise pricing. JetOctopus.
• You manage multiple large domains and want SEO, QA and accessibility auditing from one crawl engine. Lumar.
• Technical crawling is secondary to content strategy and AI-answer tracking. Conductor.

Questions to ask vendors or in a trial

1. Can the tool crawl our full site size within the plan's URL or crawl-credit limit?
2. If log-file analysis is included, what format and hosting does our server need to support?
3. How well does the crawler render JavaScript compared to what a real bot sees?
4. Can crawls be scheduled and compared automatically to flag regressions?
5. What's the actual cost once we're above the entry tier, not the marketing price?

Common mistakes

Buying an enterprise crawl-and-log platform for a site with a few thousand URLs is the most common overspend in this category — crawl budget problems are almost exclusively a large-site issue, and a desktop tool or a mid-market platform will do the job for less. The opposite mistake is trying to run Screaming Frog against a site of tens of millions of pages on a single laptop and hitting a memory wall it was never priced to solve. A third is treating a simulated crawl as equivalent to log-file truth — a page can be perfectly crawlable and still never get visited by Googlebot in practice.

Two comparisons cover specific pairs: Screaming Frog vs Sitebulb and Botify vs Oncrawl. See every tool in this category for the full list.