Screaming Frog vs Sitebulb for technical audits
I’ve had a Screaming Frog license running since 2016 and picked up Sitebulb about two years ago to see what agencies kept switching to. Both tools crawl a website and hand you a list of problems: broken links, duplicate title tags, missing canonicals, orphaned pages, redirect chains that loop back on themselves. Neither one tracks rankings, neither one holds a backlink index, and neither one does keyword research in any real sense, despite living on the same “SEO software” shelf as tools that do all three. That mismatch trips people up more than the actual feature comparison does.
If you already know what a crawl depth chart or a canonical mismatch means and want the data fast, Screaming Frog is cheaper and gets out of your way. If you’re handing findings to a client who has never heard of hreflang, Sitebulb writes half the explanation for you before you open a document. That’s the verdict in two sentences. Everything below is the detail behind it.
Before spending on either, it’s worth asking whether a crawl audit is actually where your traffic problem lives. Plenty of sites have real technical issues that don’t move rankings at all. I went through that trade-off in when SEO is the wrong investment. Assuming the audit is warranted, here’s how the two stack up.
TL;DR comparison table
| Screaming Frog | Sitebulb | |
|---|---|---|
| Pricing | Free for crawls up to 500 URLs; £199/year per license for unlimited crawls | Desktop plans start around $13.50/month billed annually on the Lite tier, scaling with crawl volume; Sitebulb Cloud sold separately on credits |
| Core strength | Raw crawl data, custom extraction, JS rendering, log file analysis (separate product) | Prioritized “hints” that explain issues in plain language, plus crawl visualizations |
| Support | Email support, a large public user forum, a detailed written user guide | Email support, onboarding help on paid tiers, video walkthroughs |
| Target user | Developers and technical SEOs comfortable with raw tables and regex | Agencies and consultants who need to explain findings to non-technical clients |
Screaming Frog at a glance
Screaming Frog Ltd is a UK company based in Henley-on-Thames, and the SEO Spider desktop crawler has been around since 2010, long enough that “just run it through the Frog” is shorthand in a lot of agency Slack channels. It’s a downloadable app for Windows, Mac, and Ubuntu, not a cloud dashboard, so the crawl runs on your own machine and the data lives in memory or a local database, your choice.
The feature list that actually matters day to day:
- crawls in spider mode (follows links) or list mode (crawls a fixed URL list you upload)
- custom extraction via XPath, CSS selectors, or regex, so you can pull anything out of the raw HTML rather than just what the tool decided to track
- JavaScript rendering through a headless Chromium instance, for sites built on React or Vue where the raw HTML tells you nothing
- pulls in Google Analytics, Google Search Console, and PageSpeed Insights data per URL once you connect the accounts
- connects to Majestic, Ahrefs, and Moz APIs to pull backlink and authority metrics into the same crawl, using whatever plan you already pay for on those services
- a separate Log File Analyser product for parsing server logs against the crawl, sold on its own license
The free version caps out at 500 URLs per crawl and disables scheduling and the third-party API connections. For most small sites that’s enough to poke around. For anything client-facing, you’ll want the license.
Sitebulb at a glance
Sitebulb is also a UK product, built by Patrick Hathaway and Gareth Eldridge and first released around 2016, specifically to fix what its founders saw as a UX problem in Screaming Frog: raw tables full of data with no explanation of why any of it mattered. Sitebulb now comes in two forms, Sitebulb Desktop (installed, similar model to Screaming Frog) and Sitebulb Cloud (browser-based, crawls run on their servers, billed on credits rather than a flat license).
What it does differently:
- every issue found gets attached to a “hint” that explains the problem, why it matters for SEO, and roughly how urgent it is
- issues get grouped by priority, critical, warning, opportunity, instead of dumped into one flat table
- crawl visualizations, force-directed link graphs and directory tree maps, are a first-class feature rather than an afterthought
- project-based structure keeps historical crawls of the same site organized and comparable over time
- integrates with Google Analytics, Search Console, and PageSpeed Insights, similar to Screaming Frog, though without the Majestic/Ahrefs/Moz pull
Sitebulb doesn’t have a free tier the way Screaming Frog does, only a trial. That changes the calculation for anyone testing casually before committing budget.
head-to-head
keyword database size
Neither tool has one.
Screaming Frog and Sitebulb are crawlers, not keyword platforms. If you want search volume or keyword difficulty data, you’re pulling it from a separate tool, possibly feeding it in through an API key, which Screaming Frog supports for a handful of providers and Sitebulb currently doesn’t. Any comparison page that scores these two on “keyword database size” is padding out a template. Skip this axis if it’s the reason you landed here.
backlink index freshness
Same story, with one real difference worth naming. Screaming Frog connects natively to Majestic, Ahrefs, and Moz inside the crawl configuration screen, so backlink counts and authority scores show up next to your on-page data. Freshness-wise it’s exactly as current as whichever of those services you’re already paying for. Sitebulb doesn’t offer that connection at all, at least not as of my last few crawls with it. If backlink data matters to your audit workflow, that’s a genuine point in Screaming Frog’s favor, and it’s worth understanding how those underlying indexes actually differ before assuming either one is “fresh enough.” I covered that in Majestic vs Ahrefs for backlink data.
rank tracker accuracy
There isn’t a rank tracker in either product. If your workflow needs one, you’re buying a third tool regardless of which crawler you pick. Worth flagging: if you’re tracking rankings at any real scale, geo-distributed proxies become part of that stack fast, and I wrote about the mechanics in how to track rankings at scale with proxies. And if you’re running that kind of tracking across a pile of client accounts rather than one, the account-management side of it turns into its own headache, closer to the territory covered on multiaccountops.com/blog/ than anything either crawler touches.
site audit depth
This is where the two products actually earn their price tags. Screaming Frog’s crawl depth is limited by your machine’s RAM in memory mode, or effectively unbounded in database storage mode, which is what you want past a few hundred thousand URLs. Sitebulb crawls just as deep but spends more effort on triage: a million-URL audit in Sitebulb comes back grouped by hint priority so you know what to fix first, rather than a spreadsheet you have to sort yourself. On a site with a genuine crawl budget problem, that grouping saves real hours. I went into the underlying causes in how to fix crawl budget problems on a big site, and either tool surfaces the symptoms fine: robots.txt disallow rules, redirect chains, thin pages eating crawl budget that should go to money pages. Both respect robots.txt the way Google’s own crawling documentation expects, and since the Robots Exclusion Protocol became a formal IETF standard in 2022, the edge cases around conflicting directives are handled the same way across most serious crawlers now, these two included.
UI/UX
Screaming Frog looks like a spreadsheet because it basically is one: dense tabs, filterable columns, no hand-holding. Sitebulb looks like software built after 2015, colored priority tags, charts, a dashboard you could screenshot straight into a client deck. I’ll say the unpopular part out loud: for the actual audit work, I prefer the ugly spreadsheet. Faster to scan, faster to filter, no wasted clicks getting to the column I want. Visualizations are for the client call, not for finding the fourteenth redirect chain on a migration.
API availability
Neither product ships a public REST API you can query from your own systems, which is the honest gap in this whole category. Screaming Frog has a command-line interface for scheduling and automating crawls on a server, and it consumes other companies’ APIs, Majestic, Ahrefs, Moz, Google, rather than exposing its own. Sitebulb Cloud leans slightly more toward automation given it’s server-side already, but I haven’t tested its scheduling depth enough to call a clear winner here. That’s a limit of my own usage, not a dodge.
exporting
Screaming Frog exports to CSV and Excel and has a native Looker Studio connector for building live dashboards off crawl data. It’s built for people who are going to keep processing downstream, in Excel, in Python, wherever the pipeline goes next. Sitebulb’s exports lean toward presentation: its audit summaries look close to client-ready without much reformatting. Neither format is bad. They’re just built for different next steps.
team seats
Screaming Frog licenses are per user, but there are bulk discounts once you’re buying five, ten, or more at a time, so an agency licensing a whole team pays less per seat than someone buying one. Sitebulb Desktop is also priced per user on its tiers, while Sitebulb Cloud pools crawl credits that a team can share instead of assigning a hard seat count, at least that was the structure last time I checked. One honest limit here: I’ve only run Sitebulb Desktop myself, so treat the Cloud team-pricing detail as secondhand rather than something I’ve billed against personally.
use-case verdicts
A solo consultant on a tight budget, auditing two or three client sites a month: Screaming Frog. £199 a year buys unlimited crawls and you already know how to read the tables.
An agency team producing recurring, client-facing audit reports every month: Sitebulb. The hint system does a chunk of your report-writing before you open a document, and that adds up across a dozen accounts a quarter.
An enterprise site with millions of URLs and a dev team that wants raw output for its own pipeline: Screaming Frog, mostly for the database storage crawl mode, the custom extraction, and a CLI you can drop straight into a cron job.
Someone learning technical SEO from scratch: Sitebulb. Being told why a hreflang mismatch matters, not just that one exists, is worth the subscription while you’re still building the mental model.
who should pick Screaming Frog
Pick Screaming Frog if you already speak the language, canonical tags, hreflang, crawl depth, and just want the data without commentary. It suits developers doing their own technical SEO, freelancers pricing by the hour who don’t want licensing costs eating margin, and anyone who already pays for Majestic, Ahrefs, or Moz and wants that data pulled straight into the same crawl instead of cross-referencing two exports by hand.
who should pick Sitebulb
Pick Sitebulb if the audit has to survive contact with a client, or a junior teammate, who doesn’t already know why crawl depth matters. Agencies running the same audit template across many accounts get real value from the hint system doing the explaining for them, and the visualizations turn a review call into something a non-technical stakeholder can actually follow instead of glazing over at a spreadsheet full of status codes.
verdict overall
Neither one replaces the other, and I’d push back on any comparison that names a single outright winner here. In practice I run crawls in Screaming Frog because it’s what I know and it’s cheap enough not to think twice about, then I keep a Sitebulb license around specifically for the audits that end up in a client-facing document. If you can only afford one and you’re technical, buy Screaming Frog first. It’s a third of the price and does everything the audit itself actually requires. If explaining the findings is half the job, Sitebulb earns its keep the first time it saves you an hour of write-up.
For more on where a crawl audit fits against the rest of the SEO tooling stack, the blog has the rest of the comparisons.
Written by Xavier Fok
disclosure: this article may contain affiliate links. if you buy through them we may earn a commission at no extra cost to you. verdicts are independent of payouts. last reviewed by Xavier Fok on 2026-09-17.