zcal.co domain authority

All metrics for zcal.co

Top referring domains of zcal.co

These are the 10 best-connected websites that link to zcal.co in the Common Crawl domain-level web graph (release cc-main-2026-jul-aug-sep, updated quarterly). zcal.co has 4,014 referring domains in total; 598 of them are among the 5,000,000 best-connected domains of the graph, which are the ones we can list and rank here.

Domain-level data: each row is a whole domain that links to zcal.co at least once somewhere on its site, not a single backlink or page, and no anchor text or link type is included. Common Crawl samples the public web, so a link can be missing and commercial backlink tools will show more.

Traffic rank of zcal.co

zcal.co is in Chrome's global Top 100K websites (August 2026), and is listed in 10 countries. Six-month trend: up: in a better bucket than 6 months ago (Top 500K then). In the global top 1M in 12 of the last 12 months.

Top countries

Last 12 months (global)

Source: Chrome UX Report (Google, CC BY 4.0), the monthly popularity lists of origins by real Chrome page loads. A rank is a bucket, not an exact position: "Top 10K" means among the 10,000 most visited origins. It measures reach in Chrome, not visits, so it is not Similarweb traffic. Rank lists by country: Traffic rank by country.

How the authority score is calculated

The score is the average of two parts, each from 0 to 100:

• Rank part: 100 × (1 − log10(rank) / log10(N))^0.6, where rank is the domain's harmonic centrality position in the Common Crawl web graph (how close it is to every other domain through links) and N is the number of ranked domains (133,241,980).
• Link part: 100 × log10(1 + referring domains) / 7, so 10 million referring domains = 100.

For this domain: rank part 65.8 (web graph rank 12,135 of 133,241,980), link part 51.5 (4,014 referring domains), average 58.6, rounded to 59.

It is consistent across all 120 million domains in the data, so it is good for ranking and filtering lists. It is not Moz Domain Authority or Ahrefs Domain Rating. Referring domains count other domains that link to this one, not individual backlinks; no list of linking pages is included.

Domains with a similar authority score

Compare and browse

• Highest-authority .co domains
• Top 1,000 domains by authority

FAQ

What is the domain authority of zcal.co?

zcal.co has a domain authority score of 59 out of 100 (moderate), based on 4,014 referring domains and a web graph rank of 12,135 among 133 million domains; its traffic rank is Top 100K websites (Chrome). The score is our own open-data metric (0-100) and is not Moz Domain Authority or Ahrefs Domain Rating.

How many backlinks does zcal.co have?

zcal.co is linked to from 4,014 other domains in the Common Crawl web graph (release cc-main-2026-jul-aug-sep). This counts referring domains, not individual backlinks, and Common Crawl does not see the whole web, so commercial tools that crawl more will show larger numbers.

How does zcal.co rank among all websites?

Its web graph rank (harmonic centrality) is 12,135 out of 133,241,980 ranked domains, which puts it in the top 0.01%. Its PageRank position is 16,066. Majestic Million ranks it #23,814.

Is the zcal.co authority score the same as Moz DA or Ahrefs DR?

No. It is an independent score computed from open data (Common Crawl, Majestic Million, Chrome UX Report). It is consistent across all domains, so it works for comparing and filtering sites, but the numbers will not match the commercial tools.

Which websites link to zcal.co?

The best-connected referring domains of zcal.co in the Common Crawl web graph (release cc-main-2026-jul-aug-sep) are google.com, amazon.com, github.com, spotify.com and cloudfront.net. This is a domain-level list from a quarterly crawl, so it names whole domains that link to zcal.co, not individual backlinks, and it is not complete.

What is the traffic rank of zcal.co?

zcal.co is in Chrome's global Top 100K websites in August 2026 (Chrome UX Report, a rank bucket rather than an exact position).