Estimated traffic gap
substack.com
Gap: incomplete
Traffic inputs are incomplete for one or both domains.
Analyst comparison
Side-by-side website comparison for analysts, SEO operators, and research teams. Use the summary, callouts, and metric table together before you move back into the domain site data reports.
This comparison is visible to users, but it is excluded from search indexing until both domains expose more overlapping estimated, measured, and detected signals.
Open the site data reports first, then return once more comparable fields are available.
Traffic data is limited for at least one domain, so compare structure and trust signals instead. substack.com scores higher on AI trust (64/100).
Estimated traffic gap
substack.com
Gap: incomplete
Traffic inputs are incomplete for one or both domains.
Trust score comparison
substack.com
Gap: 5 pts
substack.com currently scores better on the measured trust score shown on this page, which is useful for qualification and risk screening.
Detected stack breadth
substack.com
Gap: 1 signal
substack.com exposes more detected stack signals, which can help with technical benchmarking.
Measured signal tally
substack.com
1 measured signals
castle.io leads 0, substack.com leads 1, and 0 measurable signals are tied.
How to read this table
Estimated rows
Traffic and rank rows are directional estimates that help you benchmark scale, not audited figures.
Measured highlights
Green cells mark the stronger measured signal on directly comparable rows. Lower is better for Global Rank and Bounce Rate.
Incomplete inputs
Rows with missing values should be treated as incomplete, not as evidence of parity.
| Metric | castle.io | substack.com |
|---|---|---|
| Monthly Visits | -- | 166.9M |
| Global Rank | -- | #238 |
| Trust Score | 59/100 | 64/100 |
| Ahrefs DRDomain Rating by Ahrefs | -- | -- |
| Category |
Analyst next moves
Open castle.io if you want the deeper read on technology & computing, trust posture, and technology footprint.
Open substack.com if you want to confirm whether its traffic and engagement profile supports the same strategic assumptions.
Use Cloudflare as the next pivot into a technology directory if implementation overlap matters to your decision.
castle.io site data
Open the detailed data page for castle.io
substack.com site data
Open the detailed data page for substack.com
FAQ
Common questions about comparing castle.io and substack.com.
This page compares traffic, trust score, technology stack, category, domain age, and engagement metrics between castle.io and substack.com side by side.
Higher monthly visits, higher trust score, and longer domain age are better. Lower bounce rate and lower global rank number are better. Tech stack and category are shown for reference without a winner.
Data is sourced from SiteJSON reports including traffic estimates, AI-driven trust scoring, DNS records, technology detection, and category taxonomy.
| Technology & Computing |
| Technology & Computing |
| Tech Stack | Cloudflare | React, Cloudflare |
| Domain Age | -- | 15.8 yrs |
| Bounce Rate | -- | 0.5% |