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Sitebulb vs Semrush Site Audit

Sitebulb (Desktop and cloud SEO crawler) and Semrush Site Audit (Cloud SEO platform module (technical site audit)) on the same 24 capabilities, with a source for every cell and charts counted from the table.

Checked 21 October 2026 against each vendor's own public pages. Sources below.

Sitebulb

Desktop and cloud SEO crawler

Paid subscription; Cloud from £95/month (FAQ)Local or cloud

Semrush Site Audit

Cloud SEO platform module (technical site audit)

Subscription; SEO+AI Search Starter $165.17/mo annual ($199 monthly)Runs in the vendor cloud

Compatibility at a glance

Sitebulb scores 88 on coverage and 58 on automation; Semrush Site Audit scores 63 and 75. Both out of 100, counted from the table.

Out of 24 capabilities we compare for every tool.

13both have
5only Sitebulb
2only Semrush Site Audit

Market map

Crawl, audit and data coverage / Automation and AI agents: SpiderHead 71·83, Screaming Frog 92·75, Sitebulb 88·58, Ahrefs Site Audit 75·75, Semrush Site Audit 63·75, SEOnaut 8·25, LibreCrawl 29·50, advertools 21·2500252550507575100100Crawl, audit and data coverage →Automation and AI agents →SpiderHeadScreaming FrogSitebulbAhrefs Site AuditSemrush Site AuditSEOnautLLibreCrawlAadvertools
Scores are counted from the table: yes = 1, partly = ½, no or not found in public docs = 0, as a share of the rows on each axis. Horizontal: Crawl, audit and data coverage (12 rows). Vertical: Automation and AI agents (6 rows). Hover or focus a marker for the breakdown; click to keep it open.

Coverage by group

Share of rows each tool covers in a group, 0–100, counted from the table below.

30Price and setup5 rows20
50Interfaces2 rows0
50AI agents and integrations2 rows100
100Crawl3 rows50
100Audit5 rows60
63Data sources4 rows75
50Reports and follow-up3 rows50
65Overall24 rows50

Side by side

CapabilitySitebulbSemrush Site Audit
Price and setup
Free to useNo: Paid subscription; Cloud from £95/month (FAQ)Partly: Subscription; SEO+AI Search Starter $165.17/mo annual ($199 monthly)
Open sourceNo: Proprietary commercial softwareNo: Proprietary SaaS
Runs on your machinePartly: Desktop crawls locally; Cloud runs in browserNo: Crawl runs in Semrush cloud
Works without an accountPartly: Cloud and MCP need an account; Desktop not statedNo: Semrush account required (free account available)
Free tierPartly: 14-day trial equal to Pro, no card; no free tierPartly: Free account with limited tools; free SEO checker page
Interfaces
Desktop appYes: Windows 10/11 (64-bit), macOS Sonoma+ (Apple/Intel)No: Web app only
Command lineNot found in public docs: Not found in public docsNo: Not found in public docs
AI agents and integrations
MCP server for AI agentsYes: Official read-only MCP for Claude/ChatGPT, Desktop and CloudYes: Official hosted MCP (SEO, Trends, read-only Projects API)
APINo: Cloud: no API yet; webhooks and Data Studio connectorYes: Projects API v3: run audit, snapshots, issues
Crawl
JavaScript renderingYes: Evergreen Chromium rendering, all plans, toggleablePartly: Plan-dependent; docs differ by plan tier
Scheduled crawlsYes: Scheduled/recurring audits on Pro and CloudYes: Scheduled recurring audits (e.g. weekly)
Custom extractionYes: Content Extraction (CSS selector, regex) and Content SearchNot found in public docs: Not found in public docs
Audit
Audit checksYes: 300+ Hints (vendor Hints page)Yes: 140+ technical checks (feature page)
HreflangYes: Hreflang report/checkerYes: International SEO report: hreflang codes, conflicts
Structured dataYes: Structured Data validator reportPartly: Markup checks listed among audit areas
Core Web Vitals / LighthouseYes: Web Vitals and Lighthouse via Chrome, sampled (default 10%)Partly: Lighthouse-based CWV report, 10 pages per audit
AccessibilityYes: Accessibility audit, 35+ Hints linked to axe guidesNot found in public docs: Not found in public docs
Data sources
Google Search ConsoleYes: Search Console data, keywords and URL InspectionYes: Via My Reports (Search Console data in PDF reports)
Google Analytics 4Yes: GA4 (or Universal) visitor data in auditsYes: GA connection in Site Audit and My Reports
Backlink dataNot found in public docs: Not found in public docsNot found in public docs: Not found in public docs
Keyword dataPartly: Keywords report from Search Console data onlyYes: Daily keyword tracking (Starter: 500 keywords)
Reports and follow-up
Report exportsYes: Custom PDF reports, Data Studio, Google Sheets; CSV/XLSXYes: Excel, CSV, PDF; limits depend on plan
Task list and fix recheckPartly: Prioritized Hints and audit-to-audit comparisonPartly: Recurring re-audits and snapshot history
Reads Screaming Frog exportsNot found in public docs: Not found in public docsNot found in public docs: Not found in public docs
yespartlynonot found in public docs

Where each one is stronger

Sitebulb

  • Prioritized Hints (300+) explain each issue and why it matters, which suits client-facing audits.
  • Customizable PDF reports and Data Studio / Google Sheets connectors for stakeholder reporting.
  • Cloud edition supports team collaboration on shared crawl data and crawls up to 10 million URLs per audit.
  • Built-in Search Console and GA4 integration, including URL Inspection data and orphan-page discovery.
  • Site-wide Web Vitals and Lighthouse collection in the crawl, with findings grouped across pages.

Semrush Site Audit

  • Fully hosted: no installation, no local resources, crawls run in the vendor cloud
  • Same account gives keyword tracking, competitor and other SEO tools alongside the audit
  • Scheduled recurring audits with a snapshot history of earlier crawls
  • Official hosted MCP server and Projects API for reading Site Audit project data
  • PDF and report building that combines audit data with Google Analytics and Search Console

Questions

Which is cheaper, Sitebulb or Semrush Site Audit?
Sitebulb: Paid subscription; Cloud from £95/month (FAQ). Semrush Site Audit: Subscription; SEO+AI Search Starter $165.17/mo annual ($199 monthly). Prices as published on 21 October 2026; check the vendors' pricing pages before you buy.
Does Sitebulb or Semrush Site Audit run on my own machine?
Sitebulb: desktop crawls locally; Cloud runs in browser. Semrush Site Audit: crawl runs in Semrush cloud.
Can AI agents use Sitebulb or Semrush Site Audit?
MCP server — Sitebulb: official read-only MCP for Claude/ChatGPT, Desktop and Cloud; Semrush Site Audit: official hosted MCP (SEO, Trends, read-only Projects API). API — Sitebulb: cloud: no API yet; webhooks and Data Studio connector; Semrush Site Audit: projects API v3: run audit, snapshots, issues.
How much does Sitebulb cost?
It is a paid subscription with a 14-day free trial (equivalent to Pro desktop, no card). Desktop has Lite (10,000 URLs per audit) and Pro (500,000 URLs); Cloud requires 2+ users and starts from £95/month per the FAQ. Desktop prices were not readable on the pricing page; yearly plans save 15%.
Does Semrush Site Audit run on my machine?
No. Crawls run in Semrush's cloud and are configured in the web app; a Semrush account is required.

How we compared

  • Every cell comes from the vendor's own public pages (product, documentation, pricing, release notes, repository) on 21 October 2026.
  • “Not found in public docs” means we could not confirm it from an official source, not that the feature is missing. Charts count it as 0.
  • Prices and plans change. Check the vendor's pricing page before you buy.
  • Spotted something out of date? Tell us and we will correct it.

Sources

Sitebulb is a trademark of Sitebulb Limited. Semrush Site Audit is a trademark of Semrush. Names and icons identify the products compared; SpiderHead is not affiliated with, endorsed or sponsored by Sitebulb Limited or Semrush. Owners can ask us to remove an icon via contact.

Compare with SpiderHead

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