SiteWall gives security, engineering, and compliance teams continuous visibility and control over third-party JavaScript running on customer-facing websites. It discovers providers and resources, maps dependencies and browser API access, detects behavioral and performance changes, and enforces zero-trust, network, geographic, and granular permission policies. Continuous evidence and requirement-level workflows support PCI DSS, GDPR, and ISO 27001—without replacing your existing tools.

We built SiteWall because the browser has become one of the least visible parts of the modern security stack. By the time a website reaches a customer, third-party scripts can load other resources, access browser capabilities, transmit data, and change behavior—often beyond what teams can see from source code or infrastructure monitoring. SiteWall makes that activity observable and governable. It continuously discovers providers and resources, maps how they load and what they access, detects meaningful changes, and lets teams apply zero-trust and granular policies based on observed behavior. It also turns runtime evidence into clear PCI DSS, GDPR, and ISO 27001 workflows and exportable reports. We’d love feedback from security, engineering, privacy, and compliance teams: where is client-side visibility hardest for you today?

We analyzed 100 qualifying public homepages in a controlled browser study to understand what actually reaches the browser.
The median observation recorded 107.5 browser resource entries and contacted 8 registrable domains beyond the final page s domain. Cross-domain script Resource Timing entries appeared in 92 of 100 observations.
We published the full methodology, anonymized dataset, and downloadable charts so the findings can be independently reviewed and reused:
https://cellwall.io/en/research/...
We would especially value feedback on the methodology and what the security community would like examined in the next edition.

SiteWall - by CellWall

Discover, control, and prove what runs in every browser

Discover, control, and prove what runs in every browser

Forum Threads

What 100 websites revealed about client-side exposure

Forum Threads

What 100 websites revealed about client-side exposure