Screaming Frog vs Sitebulb: Pick BSA

If you do technical SEO at any real scale, you’ve probably spent time in Screaming Frog or Sitebulb. Maybe both. I ran both on client sites for a long stretch before I started questioning whether the friction was worth it. They’re solid tools. They’re also starting to feel like they were designed for a world where you audit one site at a time and print the results.

What each one actually does well

Screaming Frog is the desktop crawler most of us learned on. Fast, configurable, and if you know what you’re doing, you can pull almost anything out of it. The downside is that it runs on your laptop. Close the lid or let the battery die and your crawl is toast. Point it at a 2 million URL site and your machine sounds like it’s about to take off.

Sitebulb took a different angle. Same core idea, desktop crawler, but the reports and visualizations are much prettier. The crawl maps alone saved me from having to draw boxes in Google Slides for clients who didn’t know what a canonical tag was.

Both tools share the same ceiling. They struggle to hold a big crawl in memory, they don’t talk to a CI/CD pipeline, and getting the data into any other tool means exporting CSVs and doing manual cleanup.

Where the wheels come off

I ran a crawl on one of my sites right after a major deploy. About 1.4 million URLs, nothing crazy. Screaming Frog wanted 32GB of RAM allocated and still crashed twice before finishing. Sitebulb got further but took about 14 hours, and my laptop was useless for anything else the whole time.

That’s the real problem. Both tools assume you’re a consultant doing one audit at a time. If you’re running weekly crawls on a handful of sites, or you want to diff two crawls to see what changed after a deploy, you’re gluing things together with exports and spreadsheets. If you know my opinions about Excel, you know how that ends.

Why BSA ended up being the answer

I switched to BSA a few months ago and haven’t looked back. A few reasons:

• Built for big crawls on normal hardware. It runs locally on Windows, macOS, or Linux, and writes every page to a SQLite database as it goes instead of holding the crawl in RAM. I kick it off on a spare machine and check results the next morning.
• An actual CLI. I have a crawl wired into a deploy script that fails the build if a regression shows up. That’s not something you can do with a GUI that needs a human to click Start.
• It actually scales. The same 1.4 million URL site finished on the first run without crashing. If you want more detail on how BSA handles large-scale crawls where Sitebulb stalls out, I wrote up a dedicated Sitebulb comparison covering the scaling gap.
• Findings the other tools missed. On one of my sites, BSA surfaced a redirect chain issue involving query parameters that both of the other tools walked right past. I verified it by hand. It was real. I’ve documented more of what BSA catches that Screaming Frog doesn’t in a head-to-head breakdown of Screaming Frog’s blind spots on JavaScript-heavy sites.

Frog and Sitebulb aren’t bad tools. If you’re doing a one-off audit on a small site, either one gets the job done. But “gets the job done” is a low bar once you’re running crawls regularly, and especially once you want the data flowing into Python scripts, dashboards, or a deploy pipeline. A desktop tool is the wrong shape for that. If you’re coming from an all-in-one suite and wondering how BSA stacks up there too, the comparison with Semrush’s site audit for CI/CD and speed is worth a look.

Run the comparison yourself

BSA has a free 14-day trial with every feature and no page limit, so it covers whatever site you want to test. If you’re already paying for Frog or Sitebulb, run the same crawl through BSA and see what each one surfaces. I was genuinely surprised by what it caught. Worst case, you confirm you’ve been fine all along.

If you’re shopping for a Screaming Frog replacement, run the same audit in BSA. Free 14-day trial — no credit card.

-Sethers