Sold by: c/side
Deployed on AWS
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cside.com detects and blocks script-based attacks in the browser runtime. Every first, third, and fourth party script on your site is inspected in real time with 100% session visibility and no sampling. Our AI engine catches web skimming, Magecart attacks, and data exfiltration before malicious code reaches your users, and automates PCI DSS 6.4.3 and 11.6.1 compliance on payment pages. Deploys as a single script tag in under a day.
4.8
Overview
Your WAF protects the server. cside.com protects your customers' browsers.
Modern websites load scripts from dozens of third-party vendors. Each runs with full privileges in the browser, and any one can be compromised to skim card data, exfiltrate PII, or hijack user sessions. This attack surface is invisible to CloudFront, AWS WAF, and server-side controls that don't see how code executes in the user's browser.
cside.com closes that gap. Our lightweight script tag initializes before any third-party script executes, monitors 100% of sessions with no sampling, and blocks malicious behavior at the source.
Real-time script monitoring and blocking: Every script is inspected on every request. Our AI engine analyzes behavior in real time. What data each script accesses, where it sends data, and whether it matches known attack patterns or breach indicators. Tampered and malicious scripts are blocked before they reach the browser. Every event is logged for forensic investigation and audit.
PCI DSS 6.4.3 and 11.6.1 compliance: Automates the full client-side compliance workflow: script inventory, AI-generated written justifications, integrity checks, and tamper alerts on payment pages. Weekly audit-ready PDF reports are generated automatically. Validated by VikingCloud. Customers consistently pass QSA review on first submission.
Privacy compliance: Identify misconfigured or malicious third-party scripts that exfiltrate data and violate GDPR, CCPA, and similar frameworks.
Deploys in under a day: Single script tag in the . No stack rebuild. Works alongside CloudFront and AWS WAF to cover the browser runtime layer those tools cannot reach.
SOC 2 Type II certified. AWS Partner with Security Competency. Trusted by compliance teams at eCommerce, online retailers, payment processors, FinTech, higher education, and SaaS companies, from startups to Fortune 500s.
Highlights
- Real-time script monitoring and blocking: Inspects every first, third, and fourth party script on every request. Our AI engine detects web skimming, Magecart, formjacking, and script tampering in real time, and blocks malicious code before it reaches the user's browser. Invisible to WAFs and edge tools.
- Automated PCI DSS 6.4.3 and 11.6.1 compliance: Full client-side coverage with automated script inventory, AI-written justifications, integrity monitoring, and tamper alerts on payment pages. Weekly audit-ready PDF reports. Auditor validated by VikingCloud. Customers pass QSA review on first submission.
- Privacy and data exfiltration monitoring: Identify misconfigured or malicious third-party scripts that leak PII, violate GDPR and CCPA, or send data to unapproved destinations. Full visibility into what every script accesses, where data is sent, and which vendors touch sensitive pages, with alerts the moment behavior changes.
Details
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Pricing
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Pricing is based on the duration and terms of your contract with the vendor. This entitles you to a specified quantity of use for the contract duration. If you choose not to renew or replace your contract before it ends, access to these entitlements will expire.
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Dimension | Description | Cost/month |
|---|---|---|
Business | Business plan | $99.00 |
Vendor refund policy
Contact our support team for refund information at support@cside.dev .
Custom pricing options
Request a private offer to receive a custom quote.
Legal
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Delivery details
Software as a Service (SaaS)
SaaS delivers cloud-based software applications directly to customers over the internet. You can access these applications through a subscription model. You will pay recurring monthly usage fees through your AWS bill, while AWS handles deployment and infrastructure management, ensuring scalability, reliability, and seamless integration with other AWS services.
Resources
Vendor resources
Support
Vendor support
We have live support present inside our application or you can write an email to our support team at support@cside.dev .
AWS infrastructure support
AWS Support is a one-on-one, fast-response support channel that is staffed 24x7x365 with experienced and technical support engineers. The service helps customers of all sizes and technical abilities to successfully utilize the products and features provided by Amazon Web Services.
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Customer reviews
Frédéric B.
A simple PCI DSS solution backed by outstanding support
Reviewed on Jan 08, 2026
Review provided by G2
What do you like best about the product?
cside was straightforward to implement on our payment pages and cleanly covers PCI DSS requirements 6.4.3 and 11.6.1. The application itself is extremely intuitive, and it’s easy to understand where to go and what to do without needing to read through documentation.
Integration was simple and non-invasive. The implementation required little to no development effort and was ready to be rolled out within a few days. cside proxies our JavaScript by injecting its script first on the page, which allows it to monitor third-party scripts as well as HTTP header changes without adding unnecessary complexity.
Once in place, day-to-day usage is minimal. We receive weekly email reports that surface any relevant changes, and we only need to step in when action is actually required.
Support has been outstanding. We have direct access to the team through a dedicated Slack channel, and response times when issues arise are consistently impressive.
Integration was simple and non-invasive. The implementation required little to no development effort and was ready to be rolled out within a few days. cside proxies our JavaScript by injecting its script first on the page, which allows it to monitor third-party scripts as well as HTTP header changes without adding unnecessary complexity.
Once in place, day-to-day usage is minimal. We receive weekly email reports that surface any relevant changes, and we only need to step in when action is actually required.
Support has been outstanding. We have direct access to the team through a dedicated Slack channel, and response times when issues arise are consistently impressive.
What do you dislike about the product?
The product is still relatively new, and there are some rough edges and occasional issues. That said, the team’s fast turnaround when problems arise significantly reduces the impact of these friction points.
What problems is the product solving and how is that benefiting you?
cside helps protect our payment pages against client-side attacks by monitoring both third-party JavaScript and HTTP header changes in real time. This directly addresses PCI DSS requirements around script integrity and unauthorized modifications without requiring us to build or maintain a custom solution.
For us, the benefit is reduced risk and lower operational overhead. We gain clear visibility into what is running in the browser and how headers evolve, faster detection of unexpected changes, and confidence that our payment flows remain compliant without slowing down delivery.
For us, the benefit is reduced risk and lower operational overhead. We gain clear visibility into what is running in the browser and how headers evolve, faster detection of unexpected changes, and confidence that our payment flows remain compliant without slowing down delivery.
Jacob C.
Powerful visibility and compliance for third-party scripts
Reviewed on Oct 07, 2025
Review provided by G2
What do you like best about the product?
It finally shows what’s actually happening in the browser. You can see every script, where it comes from, what it’s doing, and whether it’s compliant or risky. The setup is quick, the dashboard is clear, and the alerts make it easy to catch issues before they become problems.
What do you dislike about the product?
Some parts of the interface still feel early, and it takes a bit to get used to how scripts are grouped and displayed. But once you understand the logic, it’s very powerful. Great onboarding and support to help you get the hang of it.
What problems is the product solving and how is that benefiting you?
We use a lot of third-party scripts, and it’s hard to know what’s actually running on the client side. c/side gives us full visibility and helps us detect unexpected behavior before it turns into a security or compliance issue. It also makes it easier to prove that we’re monitoring and managing scripts properly, which saves a lot of time during audits.
Information Technology and Services
Solid product. Works well. Great support
Reviewed on Jul 29, 2025
Review provided by G2
What do you like best about the product?
Product is great. Onboarding was super easy. After registering I learned a lot about our website and potential threats with foreign scripts. Support is also very helpful—the folks respond very diligently and help as much as they can.
What do you dislike about the product?
It’s clear that they’re still growing, so one of my qualms is that there are a lot of moving parts… The interface changes here and there but overall it’s pretty manageable.
What problems is the product solving and how is that benefiting you?
I feel safe that they are vetting the scripts on my website, and they specialize in a whole group of different threats I hadn’t considered prior. They also help with compliance so that’s a huge plus.
Joseph M.
Surprised more platforms don't have these features
Reviewed on Jul 22, 2025
Review provided by G2
What do you like best about the product?
c/side tells me everything I need to know about a script, and proactively makes sure they are safe to show to the user - if not, they detect/block it and let me know. It's also really helpful to view the script history, so I can figure out what changed if a new version seems a little sketchy. It's really made me realize how big of a problem 3rd party script security is, and there are no other solutions I've tried that dives as deep as c/side. The team is super responsive if you need support for anything, and while I don't need PCI/DSS compliance, it's great to know they cover that as well.
What do you dislike about the product?
As someone who's not super technical with how the web itself behaves, parts of how the dashboard worked (and how they explained certain concepts) was a little confusing, but reaching out to their team helped clear a lot of it up. I can tell the product is only going to keep getting better and easier to use from here.
What problems is the product solving and how is that benefiting you?
I run a small side-company that I have lots of third party scripts on, for tracking/ads/widgets etc, and I need full security to make sure I'm not posing any risks to my users. c/side genuinely solves everything I needed, and keeps me in the know with emails about any fishy scripts or attacks.
Edgardo C.
A must have if you use third party scripts
Reviewed on Jul 20, 2025
Review provided by G2
What do you like best about the product?
I use so many third party scripts, analytic tools, support widgets, polyfills, animation libraries, cdns, any of these could go rogue and replace the legit content with a keylogger or worst. Cside will email me if that happens, none of them have gone rogue yet, but Cside even warns me and shows me insights when a script changes their behavior. Such a great tool, very easy to use and simple set up on my react app, I check the dashboard every few weeks and always find something interesting about my scripts.
What do you dislike about the product?
Understanding how the proxy prefixing works and how to prevent double fetch is tricky but once you understand what is going on it's alright. Besides that, I noticed some of my scripts were using timestamp in the URL for cache busting and it flood my dashboard with entries. I changed some of those scripts and used their pattern matching feature in others.
What problems is the product solving and how is that benefiting you?
Cside will let me know if my thid party dependencies suddenly change their behavior or something suspicious happens like a domain transfer.