similarweb-compare

name	similarweb-compare
description	Side-by-side domain comparison using SimilarWeb Pro: engagement metrics, traffic channels, device split, rankings, and more.

similarweb-compare

Side-by-side domain comparison using SimilarWeb Pro: engagement metrics, traffic channels, device split, rankings, and more.

Prerequisites

• Node.js 22+
• Chrome with remote debugging (only for auth)
• chrome-cdp skill (only for auth)
• A SimilarWeb Pro account (logged in at pro.similarweb.com)

Setup

node similarweb-compare.mjs auth

Reuses session from similarweb-website if available, otherwise extracts cookies from Chrome.

Usage

# Full engagement comparison (2-5 domains)
node similarweb-compare.mjs compare chatgpt.com claude.ai
node similarweb-compare.mjs compare amazon.com ebay.com walmart.com --country=840
node similarweb-compare.mjs compare github.com gitlab.com bitbucket.org

# Marketing channel comparison (2-5 domains)
node similarweb-compare.mjs channels chatgpt.com claude.ai grok.com
node similarweb-compare.mjs channels spotify.com apple.com --country=826

How it works

1. auth -- Reuses the similarweb-website session if available, otherwise connects to Chrome via CDP and extracts SimilarWeb session cookies.

2. compare -- Makes 4 parallel API calls for all domains at once:

   • WebsiteOverview/getheader for title, category, year founded, employees
   • AssetsCompare/Overview/Table for engagement metrics (visits, unique users, visits/user, bounce rate, pages/visit, duration, page views)
   • EngagementDesktopVsMobileVisits/Table for device split (desktop vs mobile share)
   • WebRanksCountry/Table for global, country, and category rankings

3. channels -- Calls MarketingMixTotal/TrafficSourcesOverview/PieChart with all domains. Returns per-domain breakdown of traffic channels (Direct, Organic Search, Paid Search, Social, Referrals, Email, Display Ads) with visit counts and share percentages.

Data storage

~/.local/share/showrun/data/similarweb-compare/
  session.json                                    # Auth cookies
  cache/
    compare-chatgpt_com-vs-claude_ai.json         # Cached comparisons
    channels-chatgpt_com-vs-claude_ai.json

Session expiry

If API calls return 401/403, re-run node similarweb-compare.mjs auth with an active SimilarWeb session in Chrome.