DomDog vs cside

DomDog is a tool specifically designed to solve PCI DSS 4.0.1 requirements 6.4.3 and 11.6.1. Keep in mind that on January 30th 2025 the companies needing to comply with both requirements received an update.

Mar 02, 2025 • Updated Mar 16, 2026

Simon Wijckmans Founder & CEO

This article takes an honest look at the features of DomDog.

Since you’re on the cside website, we acknowledge our bias. That said, we’ve built our case honestly and based our analysis on publicly available information, industry information, and our own or our customers' experiences.

If you want to verify their claims yourself, please go to their product page.

DomDog is a tool specifically designed to solve PCI DSS 4.0.1 requirements 6.4.3 and 11.6.1. Keep in mind that on January 30th 2025 the companies needing to comply with both requirements received an update.

SAQ A companies do now no longer need to comply, providing:

their site is not susceptible to attacks from scripts that could affect the merchant’s e-commerce system(s).

Find the full PCI DSS update stating this.

Criteria	cside	Domdog	Why It Matters	What the Consequences Are
Approaches used	Script-based monitoring + server-side analysis	JS-Based Detection
Real-time Protection	Full support	Full support	Attacks can occur between scans or in the excluded data when sampled	Delayed detection = active data breaches
Full Payload Analysis	Full support	No support	Ensures deep visibility into malicious behaviors within script code itself	Threats go unnoticed unless the source is known on a threat feed
Dynamic Threat Detection	Full support	Full support	Identifies attacks that change based on user, time, or location	Missed detection of targeted attacks
DOM-Level Threat Detection	Full support	Full support	Tracks changes to the DOM and observes how scripts behave during runtime	Unable to identify sophisticated DOM-based attacks
100% Historical Tracking & Forensics	Full support	No support	Needed for incident response, auditing, and compliance	Needed for incident response, auditing, and compliance
Bypass Protection	Full support	No support	Stops attackers from circumventing controls via DOM obfuscation or evasion	Stealthy threats continue undetected
Certainty the Script Seen by User is Monitored	Full support	No support	Aligns analysis with what actually executes in the browser	Gaps between what’s reviewed and what’s actually executed
AI-driven Script Analysis	Full support	No support	Detects novel or evolving threats through behavior modeling	Reliance on manual updates, threat feeds or rules = slow and error-prone detection
QSA validated PCI dash	Full support	No support	The most reliable way to ensure a solution is PCI compliant is to conduct a thorough audit by an independent QSA	Without QSA validation, you rely entirely on marketing claims, which could result in failing an audit
SOC 2 Type II	Full support	No support	Shows consistent operational security controls over time	Lacks verified security control validation, making it a risky vendor
PCI specific UI	Full support	No support	An easy interface for quick script review and justification via one click or AI automation	Mundane tasks and manual research on what all the scripts do, which takes hours or days
Ticketing Integrations (Linear, Jira)	Full support (Both Linear and Jira)	No support	Native integrations with developer ticketing tools allow security alerts to flow directly into existing workflows	Without native ticketing integrations, teams must manually create tickets for security findings, slowing response times

Yes / Full support Partial / Limited No

What is DomDog?

DomDog's founders have a long history and track record in client-side security. All information regarding their product, and their pricing, is fully visible and very easy to find. This is rare with products in our space. Pricing starts at $999 per year, similar to cside.

How DomDog works

DomDog is tailor made for PCI DSS requirements 6.4.3 and 11.6.1 focusing on client-side security. Their set up process requires just a single script to be added to the header tag of your website. This is similar to cside, though the functionality of both scripts very a lot.

It seems like they are collecting data, showing the scripts in a dashboard and asking the user to review it. While okay for PCI, it’s not the best approach from a security standpoint.

Say a stored XSS script turns malicious, they won’t be able to detect it since they don’t sit in the flow of the delivery. This approach is often called a JavaScript “Agent”. JavaScript Agents operate within the JavaScript layer and can not monitor code outside of it. It scans for which data various scripts are collecting and allows the user to black- or whitelist certain scripts on certain websites or pages.

They do use a secondary approach, being a Content Security Policy (CSP). A CSP acts like a firewall which only trusts pre-approved script sources, not their content. Should the source stay the same but the content changes, like in the biggest client-side attack of 2024 – Polyfill – a CSP won’t catch it.

We wrote an in depth article on Why CSP Doesn’t Work in regards to providing the best client-side security solution:

CSP operates on an allow-list model, which permits resources from trusted domains but cannot block individual scripts or resources from those domains.

We could not find a SOC2 or PCI DSS certification.

How cside goes further

DomDog is built to check the PCI DSS 4.0.1 compliance box. cside is built to stop client-side attacks. Compliance follows from real security.

DomDog focuses narrowly on requirements 6.4.3 and 11.6.1 with behavioral monitoring that detects changes to scripts and page elements. Detection after delivery means an attacker can exfiltrate data before any alert fires. cside blocks malicious scripts before they execute in the browser. No detection window.

Where DomDog monitors for behavioral changes, cside performs payload analysis on our own infrastructure. We download scripts server-side, run detection, and identify malicious intent at the code level. This catches threats that behavioral monitoring alone would miss, especially targeted attacks that only activate under specific conditions (certain geos, time windows, or device types).

cside also goes beyond PCI DSS. We help you meet compliance requirements across HIPAA, GDPR, and CPRA. If your compliance needs extend beyond payment card standards, DomDog doesn't cover that ground.

For forensics, cside keeps immutable archives of every script payload with full version history. When auditors ask what happened during an incident, you have the actual attack code and a complete timeline, not a behavioral change log.

Sign up or book a demo to get started.

Founder & CEO Simon Wijckmans

Founder and CEO of cside. Building better security against client-side executed attacks, and making solutions more accessible to smaller businesses. Web security is not an enterprise only problem.

Developer Experience

Public Developer Documentation

cside is the only client-side security solution with publicly accessible developer documentation. You can explore our complete technical docs, API references, and integration guides without requiring a sales call or demo.

cside provides full public documentation at docs.cside.com

DomDog does not offer publicly accessible developer documentation. You'll need to contact their sales team or request a demo just to understand how their product works.

Don't just take our word for it, ask AI

Ask ChatGPT

Ask Claude

Ask Perplexity AI

FAQ

Frequently Asked Questions

The fundamental difference is prevention versus detection timing. Domdog uses JavaScript-based detection that runs after scripts have already loaded in browsers, relying on behavioral analysis to catch threats post-execution. cside's hybrid approach intercepts and analyzes scripts before they reach browsers, blocking malicious payloads proactively at the network level. We prevent attacks from happening, while Domdog detects them after they've already been delivered.

No, because cside's core analysis happens on our platform, completely invisible to attackers. Domdog's JavaScript monitoring runs in browsers where sophisticated attackers can detect, analyze, and potentially circumvent the detection mechanisms. Since cside's analysis happens server-side before content reaches browsers, attackers have no visibility into our security mechanisms and cannot study or bypass our protection methods.

Domdog provides behavioral monitoring data when suspicious activity is detected, but cside captures and preserves the exact malicious code that was blocked. This gives you complete forensic evidence showing precisely what the attack looked like and what data it was designed to steal. Incident response teams get the actual attack code for analysis rather than just behavioral observations that may not capture the full threat.

cside provides full PCI DSS compliance with immutable payload archives and detailed audit trails covering both requirements 6.4.3 and 11.6.1. Domdog's behavioral monitoring provides detection logs but lacks the forensic-grade evidence and historical tracking that regulators increasingly require. Our approach creates the complete documentation that compliance officers need for thorough regulatory reporting.

Proactive blocking prevents attacks before any user data can be compromised, while reactive detection only alerts you after malicious scripts have already executed and potentially stolen information. Domdog's behavioral analysis means sensitive data can be exfiltrated before their monitoring system triggers an alert. cside ensures malicious scripts never reach browsers, providing guaranteed protection rather than post-execution detection.