Website Traffic Estimator

SimilarWeb Traffic

Fetch traffic-overview estimates for any domain — monthly visits, traffic-source breakdown, top countries, top keywords, engagement metrics, and global/category ranks.

When to Use This Skill

Use this skill when the user:

• Asks how much traffic a domain gets ("what's the traffic for X")
• Wants monthly visit trends for a site
• Needs a traffic-source breakdown (organic vs direct vs paid vs GenAI, etc.)
• Wants to know a site's audience countries
• Wants to compare/benchmark several domains against each other or competitors

Usage

No API key required. Self-contained Node script (uses built-in fetch, no npm install).

node scripts/fetch-similarweb-traffic.js <domain>

Examples:

# Formatted markdown summary (default)
node scripts/fetch-similarweb-traffic.js chatslide.ai

# Raw normalized JSON (for further processing / comparisons)
node scripts/fetch-similarweb-traffic.js stripe.com --json

The domain can be passed bare (example.com) or as a URL (https://www.example.com/pricing) — it gets normalized (strips scheme, www., and path).

Comparing multiple domains

Run the script once per domain with --json and combine the results into a table. Add a short delay between calls to be polite to the endpoint.

Output

Default mode prints a markdown summary: a metrics table (monthly visits, ranks, bounce, pages/visit, time on site), a monthly-visits trend line, traffic-source breakdown, top countries, and top keywords.

--json mode prints a normalized object:

{
  "domain": "stripe.com",
  "globalRank": 327,
  "categoryRank": 21,
  "category": "Finance",
  "snapshotMonth": "2026-05",
  "visits": 122394040,
  "bounceRate": 0.55,
  "pagesPerVisit": 3.26,
  "timeOnSite": 165.9,
  "estimatedMonthlyVisits": [{ "date": "2026-03-01", "visits": 118067753 }],
  "trafficSources": { "searchOrganic": 0.48, "direct": 0.23, "...": 0 },
  "topCountries": [{ "countryCode": "US", "value": 0.087 }],
  "topKeywords": ["..."]
}

visits is the most recent complete month. Rates (bounceRate, all trafficSources, topCountries[].value) are 0–1 fractions.

API Details

• Endpoint: https://data.similarweb.com/api/v1/data?domain=<domain> — SimilarWeb's undocumented public data endpoint (the one their browser extension uses). No auth, no key, free.
• Requires a browser user-agent header (the script sends one) — default curl/bot agents are blocked.
• Synchronous, returns immediately.

Important Notes

• Estimates, not ground truth. SimilarWeb models traffic; numbers can be off, especially for mid/low-traffic sites. For a domain you own, your own Google Analytics / Search Console data is authoritative — prefer those when available.
• Unknown domains return zeros, not an error. SimilarWeb responds HTTP 200 with all-zero/synthetic data when it has no data for a domain. If every visit count is 0, treat it as "no SimilarWeb data."
• Unofficial endpoint. It can be rate-limited, change shape, or require auth without notice; this is a gray-area use of SimilarWeb's data outside their paid API.
• Exit codes: 2 network error, 3 non-200 HTTP response.