DomDog Alternative: cside vs DomDog (2026)

DomDog is a tool specifically designed to solve PCI DSS 4.0.1 requirements 6.4.3 and 11.6.1. On January 30th 2025, companies needing to comply with both requirements received an update.

Mar 02, 2025 • Updated Jul 19, 2026

Simon Wijckmans Founder & CEO

DomDog Alternative: cside vs DomDog (2026)

TL;DR: cside vs DomDog

DomDog is CSP tooling for reporting and violation triage. It only sees what CSP is configured to observe, and it does not analyze payloads or archive attack code.
cside runs in 100% of real user sessions with no sampling, downloads every script to its own infrastructure for server-side analysis, and archives raw attack code. CSP allowlists a domain. cside analyzes what that domain actually serves.
Only need CSP reporting: DomDog. Need real-time payload analysis, script inventory, tamper detection, and QSA evidence: cside.

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.

A stored XSS payload that turns malicious is exactly what a source-only inventory misses: cside records what each script does in the real session and re-fetches and hashes the script server-side, so a change in what a source actually serves shows up as a new payload and a new hash. DomDog's 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. cside records what each third-party script actually did in the session, across six classes of behaviour: form-field access, permissions, network requests, storage, key event listeners, and DOM manipulation. Every record carries a call-stack trace naming the script URL, its content hash, the line and column, and the vendor, so you learn which script read the CVV field rather than only that something on the page changed. Blocks are enforced at runtime in the browser, alongside CSP.

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.

cside also publishes a public status page at status.cside.com, a public trust portal at trust.cside.com, and a 99.9% uptime SLA, so you can verify our reliability and incident history for yourself. DomDog publishes none of these.

Try cside before you buy. cside has a free plan, so you can sign up, deploy, and explore the platform yourself, with no sales calls or procurement process. And our support team is one message away whenever you need a hand.

Sign up or book a demo to get started.

Related resources

Founder & CEO Simon Wijckmans

Founder and CEO of cside. Previously a product manager on Cloudflare Page Shield (now Cloudflare Client-Side Security). Co-chair of the W3C Anti-Fraud Community Group and a Forbes 30 Under 30 honoree. Building accessible security against client-side attacks, 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

FAQ

Frequently Asked Questions

The difference is attribution. Domdog uses JavaScript-based detection that runs after scripts have loaded in browsers and reports behavioral changes. cside runs one first-party script tag that records what each third-party script actually does, across six classes of behaviour: form-field access, permissions, network requests, storage, key event listeners, and DOM manipulation. Every recorded behaviour carries a call-stack trace naming the script URL, its content hash, the line and column, and the vendor, and cside separately fetches the same script server-side to hash, archive and analyse the payload. So you get a record that a script on your checkout page read the CVV field, with a hash attached, rather than an alert to go investigate. Blocks are enforced at runtime in the browser, alongside CSP, rather than only reported after the fact.

Partly. cside runs a first-party script in the page, so it is visible like any client-side product, and Domdog's JavaScript monitoring runs in browsers where a sophisticated attacker can study the detection mechanisms. The cross-check is what makes cside hard to fool: every behaviour cside records is keyed to a content hash of the script that ran, and cside holds its own server-side fetched copy of that script to diff against. A range of cside's detections never run in the browser at all, they run server-side against that fetched payload, and an anti-tamper package makes the in-page detections materially harder to manipulate than a plain in-browser agent.

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.

Detection alone only alerts you after malicious code has already run in the browser, and Domdog's behavioral analysis means sensitive data can be exfiltrated before their monitoring system triggers an alert. cside enforces blocks at runtime in the browser, alongside CSP, so an unauthorised script or a specific capability it tries to use is stopped in the session rather than only logged afterwards. Everything cside does allow is recorded with the content hash of the script that produced it, so the evidence is there whether or not a rule fired.

Related comparisons