Sold by: c/sideÂ
Deployed on AWS
c/sides monitors, secures and optimizes 3rd party JavaScript. We see the payload of the scripts on every request, and keep track if any malicious changes. Primarily, c/side aims to stop 0-day 3rd party JavaScript attacks. We see the code in real time, loaded in the proxy, and block any malicious activity. See the full overview and code changed in our dashboard, along with compliance reports.
Overview
c/side secures the final link in the web supply chain: the client-side. Our 3rd party JavaScript proxy checks the payload of the script on every request. Allowing us to spot changes, malicious activity and block proactively before the altered code touches the browser of your user.
Our dashboard highlights the changes with AI explaining the functionality. Our deobfuscation functions allows engineers to understand fully what code actually gets served the the browser of their users and visitors. Certain compliance regulation (PCI DSS 4.0.1) requirements are ticked off by our compliance dashboard, including configuration issues.
Most scripts can be optimized. We do so by rewriting (where possible) without breaking functionality, caching and better infrastructure to serve them faster. In certain scenarios we've seen up to 22x faster delivery. This nearly fully mitigates any latency in scripts that aren't loaded asynchronously.
Manage and mitigate cyber attacks targeting 3rd party scripts on your websites. Finally see and secure the end of the web supply chain.
Contact us to upgrade to our enterprise solution.
Highlights
- Blocking 0-day 3rd party JavaScript attacks: Our man-in-the-middle proxy sees the payload of the scripts served in the browser of your users. We spot and block any malicious code before it gets served to the browser of your user.
- AI explanation: Our dashboard saves all versions of the scripts, any change is recorded, saved and highlighted. Our AI features explains the change and the likely functionality of the change. Additionally, it deobfuscates the code for you to fully understand and trust.
- Compliance: Fast approaching and improved compliance regulation regarding 3rd party scripts is covered in c/side. Our PCI DSS dashboard ticks off all new requirements regarding these compliance rules.
Details
Features and programs
Financing for AWS Marketplace purchases
AWS Marketplace now accepts line of credit payments through the PNC Vendor Finance program. This program is available to select AWS customers in the US, excluding NV, NC, ND, TN, & VT.
Pricing
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.
Additional AWS infrastructure costs may apply. Use the AWS Pricing Calculator to estimate your infrastructure costs.
Dimension | Description | Cost/month |
|---|---|---|
Business | Business plan | $99.00 |
Vendor refund policy
Contact our support team for refund information at support@cside.dev .
Legal
Vendor terms and conditions
Upon subscribing to this product, you must acknowledge and agree to the terms and conditions outlined in the vendor's End User License Agreement (EULA)Â .
Content disclaimer
Vendors are responsible for their product descriptions and other product content. AWS does not warrant that vendors' product descriptions or other product content are accurate, complete, reliable, current, or error-free.
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.
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
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5 external reviews
Star ratings include only reviews from verified AWS customers. External reviews can also include a star rating, but star ratings from external reviews are not averaged in with the AWS customer star ratings.
Information Technology and Services
Improved speed and transparency for client side JavaScript.
Reviewed on Jun 27, 2025
Review provided by G2
What do you like best about the product?
Third-party party client-side scripts often go unchecked and are a target for malicious actors. c/side puts you back in control of your web properties ensuring that third-party scripts behave as expected and are free from vulnerabilities. It's super quick to implement and once you've done that, you are able to keep tabs on all the changes to your scripts quite easily.
What do you dislike about the product?
Honestly, there’s not much to dislike about c/side — it’s reliable and thoughtfully designed. I’m eager to see even more advanced customization options as the product continues to grow. The team has been responsive to feedback and quick to ship improvements, which gives me confidence in the roadmap ahead.
What problems is the product solving and how is that benefiting you?
Third-party script supply-chain risk.
Yusuf B.
Gives us needed visibility into client-side activity
Reviewed on Jun 10, 2025
Review provided by G2
What do you like best about the product?
It helps us understand what third-party scripts are actually doing on our site, which used to be pretty opaque. Instead of relying on assumptions or manual checks, we can now see script behavior clearly, which has helped us spot issues we wouldn’t have caught otherwise. It’s also been helpful when coordinating with teams during incidents.
What do you dislike about the product?
Some parts of the interface aren’t immediately intuitive. It took a bit of trial and error to get familiar with the different views and how to filter the data effectively. Also, it would be helpful to have more built-in guidance or examples for interpreting script behavior.
What problems is the product solving and how is that benefiting you?
c/side tackles tricky client-side threats like script injection and data skimming, which often get missed. It also keeps an eye on all those third-party scripts, giving organizations real-time control and helping them stay compliant without slowing things down.
Mark D.
Highly Recommended for PCI and more
Reviewed on Jun 06, 2025
Review provided by G2
What do you like best about the product?
We have tried multiple products in the same space, but unfortunately, almost all of them turned out to be just compliance checkboxes, offering little to no real value.
We did a POC with c/side for PCI compliance, and within the first week, our team started seeing real value.
The dashboard had a good UI/UX and was easy to navigate. The way the product works made a lot of sense and helped us improve our security posture.
We would definitely recommend the product for PCI and more.
The detection capabilities we got with C/Side were unlike anything we saw in other products we tested in the past.
We did a POC with c/side for PCI compliance, and within the first week, our team started seeing real value.
The dashboard had a good UI/UX and was easy to navigate. The way the product works made a lot of sense and helped us improve our security posture.
We would definitely recommend the product for PCI and more.
The detection capabilities we got with C/Side were unlike anything we saw in other products we tested in the past.
What do you dislike about the product?
Not much to add in this section, we really like the product. We are excited to see what new features they bring in the future. They have already innovated in client-side attack detection, and we’d love to see the same disruptive approach continue.
What problems is the product solving and how is that benefiting you?
We have used the c/side proxy, which proxies third-party JavaScript files. It can alert, detect, or block malicious scripts, helping users see all third-party scripts in use and understand what data is being sent to which websites and regions.
Michael H.
Onboarding experience
Reviewed on Apr 01, 2025
Review provided by G2
What do you like best about the product?
- very informative kick off meeting and product presentation
- efficient onboarding experience
- slack support channel with very quick responses
- efficient onboarding experience
- slack support channel with very quick responses
What do you dislike about the product?
nothing to dislike about c/side, nothing to dislike about c/side
What problems is the product solving and how is that benefiting you?
Coverage of new requirements (6.4.3 and 11.6.1) for PCI compliance
Consulting
Client-Side Security Has Never Been More Secure
Reviewed on Apr 01, 2025
Review provided by G2
What do you like best about the product?
With c/side, we now have a way to protect our clients/customers from potential cyber threats that are often overlooked by traditional cybersecurity measures.
What do you dislike about the product?
It can sometimes introduce minimal latency.
What problems is the product solving and how is that benefiting you?
Traditionally, cybersecurity is focused in protecting the servers. c/side is a cybersecurity startup with expertise in third-party web script monitoring, optimization, and security—a field frequently neglected but absolutely vital. Third-party scripts are essential to the functionality of websites, supporting analytics, chatbots, and error handling, among other features. Yet they frequently update without a business's awareness, creating tremendous security threats. Malicious entities can take advantage of vulnerabilities within these scripts to reroute website visitors, harvest sensitive data, or alter website content.
Recommendations to others considering the product:
If your website is a high-value target for browser supply chain attacks (e.g., finance, healthcare, e-commerce, SaaS), c/side offers a proactive security layer that could significantly reduce risk.