Free Sitebulb alternative

Sitebulb is a website auditing tool for SEO professionals that crawls your site to find technical issues and explains them with visuals and prioritized Hints, sold as a desktop app or as Sitebulb Cloud. SEO Skill is free: web tools for the everyday lookups, and your own Search Console, Google Analytics and keyword data in your AI agent.

Get started free

Run it in a terminal, then sign in with Google.

Or run it on your machine

Installs the CLI, signs you in and adds the skill to your agents. Site crawls and Bing data run this way, on your own machine. A crawl fetches many pages, and Bing blocks our hosted server.

At a glance

The four things most people compare first, from each product's own pages.

SEO Skill

Free use: Every on-demand tool, no usage cap
Paid: $50 a month per site, for the weekly audit
Works in web chat: Yes
Get started: Free web tools with no account, or one URL in your AI agent

Sitebulb

Free use: 14-day free trial, no card
Paid: £12.50 a month (Lite)
Works in web chat: Yes, as a custom connector in Claude or a plugin in ChatGPT, on every plan and the free trial. For desktop audits the Sitebulb app must be open, signed in and online.
Get started: Create an account

Free tools for the jobs you use Sitebulb for

No account and no key. Each one opens in your browser.

robots.txt validator and tester

Check a robots.txt file for errors and test whether specific crawler URLs are allowed or blocked.

Open the robots.txt validator

XML sitemap validator

Check a pasted, uploaded, or published XML sitemap for errors.

Open the XML sitemap validator

Canonical tag checker

Inspect pasted HTML for missing, invalid, multiple, relative, or cross-site canonical links.

Open the canonical tag checker

Schema markup validator

Check pasted JSON-LD or HTML for syntax errors and missing properties in supported profiles.

Open the schema markup validator

Pick Sitebulb if

From Sitebulb's own pages.

you want technical audits explained in plain words, with prioritized Hints and visual crawl maps.
you want to try the full Pro app for 14 days with no credit card.
you want to ask Claude or ChatGPT on the web about your crawl data through a read-only MCP.
your team needs cloud crawling of very large sites with shared audit data.

Pick SEO Skill if

Free SEO tools in your browser, and your own search data in your AI agent.

You want the everyday lookups for free: backlinks, Domain Rating, competitor keywords, SERPs and traffic estimates, with no account.
You want your AI agent to answer from your own Search Console and Google Analytics data, not only from an index estimate.
You already pay for keyword data: SEO Skill uses your own DataForSEO or Ahrefs key, so you pay that provider and nothing on top.
You want a weekly crawl, daily index checks and drop alerts for $50 a month per site, with no seats to buy.

Side by side

Every fact we compared, with Sitebulb's taken from the sources at the end of this page.

SEO SkillSitebulb

Get started

SEO Skill: Use the free web tools with no account. For your own data, add https://seoskill.dev/mcp to your AI agent and sign in with Google (read only).

Sitebulb: Register for the free trial with your name and email, then download the desktop app. The 14-day trial is equal to Sitebulb Pro and needs no credit card. Paid plans are paid by credit card or PayPal, and invoice is possible on yearly plans. Cancel any time.

What it does

SEO Skill: Free web tools: backlink checker, Domain Rating, competitor keywords, SERP checker, traffic estimates, robots.txt, sitemap, schema and more. In your AI agent: Search Console reports (quick wins, low CTR, striking distance, content decay, cannibalization, traffic drops), page checks, index checks, before and after comparisons, and keyword research with your own key. A site crawler and internal links in the CLI.

Sitebulb: Technical SEO audits with prioritized Hints (100+ on Lite, 300+ on Pro), JavaScript crawling, duplicate content, crawl maps and Google Analytics, Search Console and Sheets integration on every plan. Pro adds advanced configuration, audit comparisons, scheduled audits, customized PDF reports, performance and mobile friendly, structured data, international and hreflang, spell checker, accessibility, AMP and auto-export to Google Sheets. Sitebulb Cloud adds cloud crawling with no project limits and recurring crawls. The Sitebulb MCP is on all Desktop and Cloud plans, including the free trial. It is read-only and comes with pre-built Skills.

Data

SEO Skill: Google Search Console, Google Analytics, URL Inspection, Clicky, and DataForSEO or Ahrefs with your own key. Bing Webmaster Tools in the CLI. Free Domain Rating by Ahrefs on research rows.

Sitebulb: Its own crawl of your site (desktop app or Sitebulb Cloud), Google Analytics, Google Search Console, Google Sheets

Where you use it

SEO Skill: Your browser for the web tools. Claude Code, Claude, ChatGPT, Codex, Cursor, VS Code, Gemini CLI, Windsurf, Le Chat and any remote MCP client for your own data.

Sitebulb: Desktop app for Windows, Desktop app for macOS, Sitebulb Cloud in the browser, Claude (custom connector), ChatGPT (plugin)

In Claude or ChatGPT on the web

SEO Skill: Yes

Sitebulb: Yes, as a custom connector in Claude or a plugin in ChatGPT, on every plan and the free trial. For desktop audits the Sitebulb app must be open, signed in and online.

Free

SEO Skill: Every on-demand tool, with no usage cap and no time limit.

Sitebulb: No free version stated. A 14-day free trial equal to Sitebulb Pro desktop, with no credit card and no up-front commitment. The MCP works during the trial.

Paid plans

SEO Skill: The weekly site audit is $50 a month per site: weekly crawl, daily Google index checks, stored history, drop and return alerts, and a Monday email and webhook. Cancel any time.

Sitebulb: Lite £12.50 a month, or £125 a year (1 user, 10,000 URLs per audit). Pro £30 a month, or £305 a year for 1 user (500,000 URLs per audit, can be raised to 2 million), extra users £7.50 a month or £77.50 a year. Sitebulb Cloud from £95 a month, or from £1140 a year, for 2 or more users. Yearly plans save 15%. In US dollars: Lite $18 a month or $180 a year, Pro $42 a month or $425 a year, extra Pro users $11 a month or $115.60 a year, Cloud from $125 a month or $1500 a year. Prices are also shown in euros.

Can it change your site

SEO Skill: Read-only Google sign-in. Your agent can start the paid audit for a site, which returns a Stripe Checkout link for you to open.

Sitebulb: No. The MCP is read-only. It reads finished audits and cannot start crawls. No changes to your site or to Google are stated.

Your data

SEO Skill: Search Console and analytics rows are fetched on each request and never stored, except what the paid weekly audit keeps for its sites. Your linked accounts and saved keys are kept, encrypted.

Sitebulb: Desktop crawl data lives on your own computer and is read only when a question needs it. Cloud data is held in your Cloud workspace. What it keeps from a connected Google Search Console or Google Analytics account is not stated.

History

SEO Skill: Google's 16 months, read live. With the weekly audit, crawl and index history for the sites you audit.

Sitebulb: Not stated. Pro can compare your own audits over time.

Licence

SEO Skill: Hosted service, with the CLI and local MCP server open source (Apache 2.0)

Sitebulb: Paid desktop subscription (Sitebulb Cloud is a hosted service)

Move from Sitebulb in a few minutes

Nothing to migrate: SEO Skill reads your accounts live. When you are done, remove Sitebulb from your agent and revoke its access.

Add SEO Skill to your agentUse the setup box above, or the steps for your client on the integrations page.
Check your access
Ask "list my Search Console properties". Every Google account you link shows up.
Add your research keySave a DataForSEO or Ahrefs key on your account page if you use keyword research.
Keep what you still need
Projects and history you built in Sitebulb stay there. SEO Skill reads Search Console live, so you can run both while you decide.

More comparisons

Other ways to give your agent search data, next to SEO Skill.

AccuRanker

Free: No. Paid: $249 a month (Professional).

Free AccuRanker alternative

Ahrefs

Free: Free account, verified sites. Paid: $29 a month (Starter).

Free Ahrefs alternative

AnswerThePublic

Free: Free, 3 searches a day. Paid: US$20 a month (Starter).

Free AnswerThePublic alternative

Majestic

Free: Free account, limits not stated. Paid: $49.99 a month (Lite).

Free Majestic alternative

Questions about Sitebulb

Desktop crawl data lives on your own computer and is read only when a question needs it. Cloud data is held in your Cloud workspace. What it keeps from a connected Google Search Console or Google Analytics account is not stated. SEO Skill fetches your Search Console and analytics rows on each request and does not keep them, except for sites in its paid weekly audit, where it keeps the crawls, index checks with each page's clicks and impressions, and the issues list.

Sources for Sitebulb, read 3 November 2026: Plans, prices in GBP and USD, URL limits, features by plan, free trial with no card, payment methods, Windows and Mac, Free trial sign up with name and email, then download, MCP on all plans and the trial, read-only, Claude and ChatGPT, Skills, Claude custom connector for Sitebulb Desktop, app must be open, Where Desktop and Cloud data lives.