Sitebulb is a technical SEO crawler known for clear, visual reports and its prioritised “hints”. It is a strong choice for SEO agencies that audit sites every week. SignalCrawler covers a different need: audits now and then, with the browser and mobile testing a QA tester would do, paid per scan.
Facts about Sitebulb were checked on its pricing page on 11 October 2026.
At a glance
| Sitebulb | SignalCrawler | |
|---|---|---|
| Where it runs | Desktop (Lite, Pro) or Sitebulb Cloud | In the browser |
| Trial and free use | 14-day free trial, no card | 3 free scans after sign-up |
| Pricing model | Monthly or yearly subscription; Cloud from £95 per month | Scan packages, no subscription (pricing) |
| Crawl size | Lite 10,000 URLs per audit, Pro 500,000 | Up to 2,000 URLs per deep scan |
| Technical SEO depth | Very deep, with prioritised hints | Broad, with each finding confirmed and grouped by template |
| Accessibility | Detailed accessibility audit | Basic checks (axe-core, focus, contrast in menus and dialogs) |
| Screen widths and screenshots | Mobile rendering in the crawl | Ten widths from 320 px, screenshots with the problem outlined |
| Browser QA (longer text, missing images, menus, forms, clicks) | No | Yes |
| Output | Interactive reports and exports | Report with evidence, a plan of fixes, a bug list spreadsheet |
Choose Sitebulb if
- You audit large sites, or many sites, every month.
- You want deep technical SEO data and visualisations such as crawl maps.
- A subscription makes sense for how often you crawl.
Choose SignalCrawler if
- You audit a site occasionally: before a launch, after a redesign, when traffic drops.
- You want the mobile and browser problems found too, with screenshots a developer can act on.
- You prefer paying per scan to a monthly subscription.
- The people reading the report are site owners, managers or developers, not SEO specialists.
Limits to know
SignalCrawler crawls up to 2,000 URLs per scan and samples pages of each template for the browser tests, so it does not replace a full crawl of a 100,000-page site. Within that size, it gives you a prioritised plan rather than a list of every URL.