This article takes an honest look at the features of Jscrambler Web Page Integrity, another company focussing on client-side security.
Since you’re on the c/side 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 these claims yourself, please navigate to their product page.
Jscrambler’s detection approach focuses on identifying suspicious script behavior in real time and blocking specific script actions inside the browser.
Unlike c/side, Jscrambler does not act as part of the delivery flow of third-party scripts. They have a JavaScript trap-based system that aims to spot mistakes in the script. Though these traps are sometimes visible to the attacker, hence avoidable.
| c/side | Jscrambler | |
|---|---|---|
| Doesn't solely rely on CSP policies | ✔️ | ✔️ |
| Doesn't cause console errors | ✔️ | ✔️ |
| Client side JS script detection | ✔️ | ✔️ |
| Uses threat feed intel | ✔️ | ✔️ |
| Monitors Who-is records | ✔️ | ✔️ |
| Monitors SSL | ✔️ | |
| Able to detect inline scripts | ✔️ | ✔️ |
| Uses AI and ML to analyse scripts | ✔️ | ✔️ |
| Creates allow lists for scripts | ✔️ | ✔️ |
| Block scripts before entering the user's browser | ✔️ | |
| Proxies scripts | ✔️ | |
| Stores script content for future review | ✔️ | |
| Tracks historical changes in scripts | ✔️ | |
| Performance enhances scripts | ✔️ | |
| Paid tier starts at | $99 per month | Unkown |
What Jscrambler does well
Just like us, Jscrambler analyses every user session. Competitors such as Cloudflare Page Shield only inspect a sample of sessions. Covering all sessions is crucial for spotting real-world attacks.
Jscrambler also doesn’t solely rely on threat feeds, which are very slow to respond and often give false positives and negatives. Jscrambler actively inspect JavaScript execution in real time. This approach makes them one of the few tools that dynamically detect script anomalies, just like c/side
They also provide granular control over script permissions. Their system gives developers advanced settings to manage script access, which is useful for fine-tuning protection mechanisms.
What Jscrambler could do better
Jscrambler originally started as a JavaScript obfuscation tool to protect intellectual property. In 2021, they expanded their offering to include client-side security by adding Webpage Integrity, which detects malicious script behaviors in the browser.
Unlike c/side, Jscrambler does not integrate into the delivery flow of third-party scripts. Instead of proxying scripts before they reach users, they rely on another JavaScript-based approach.
This is a single point of failure.
Jscrambler is a JavaScript trap-based system. They focus only on behavioral monitoring, failing to capture the exact payload delivered to users. This approach usually generates a high number of false positives because many JavaScript behaviors are common across scripts. In attacks like Magecart, where form elements are hooked and data is exfiltrated—a behavior also seen in legitimate scripts—the excessive noise makes it easy to miss actual threats, effectively burying real attacks in a flood of irrelevant alerts.
Or even worse, they go straight through.
They function essentially as traps, but the traps are visible so bad actors can easily circumvent detection with little effort. Most tools lack historical visibility—meaning they cannot track script evolution over time or provide forensics.
In security, it is important to realize that you don't know what you don't know. If you build a solution that is designed to stop explicit behavior X, anything that doesn't match X is allowed. This can easily lead to a situation where you’ve allowed bad behaviors and are totally unaware of them, with no ability to look back to improve the detection ability.
1. Not providing historical analysis.
Modern attackers constantly adapt. A script might appear harmless today but become malicious tomorrow after an update.
At c/side, we store every version of every script to:
- Compare changes over time. If a script’s behavior shifts, we flag it.
- Assist investigations. If an attack occurs, customers can review past versions to track how a script was compromised.
3. Alerts but does not automatically block threats
Jscrambler only mentions blocking in cases of making a blocking list. This likely means blocking the source of the script based on behavioural or manual action. Nowhere do they seem to mention autonomous blocking—only "mitigation options" that start in their third-tier plan (Forms Control).
They will alert you when they spot a potential weird or malicious script.
At c/side, we proactively block scripts we deem malicious. Due to the proxy approach, the malicious code never touches the user.
3. Not AI-powered
Jscrambler relies on manual rule-based detection rather than AI-driven analysis.
At c/side, we run machine learning models that:
- Continuously adapt to new attack patterns.
- Identify subtle anomalies that might be missed with rule-based detection alone.
- Reduce false positives by learning normal script behaviors over time.
Jscrambler does not mention any AI-driven improvements to their detection system, which means their model requires manual tuning and may be slower to adapt to emerging threats.
4. Pricing and transparency
Jscrambler does not publicly disclose its pricing. Instead, their Webpage Integrity solution is hidden behind a "Contact Us" paywall.
Find c/side’s pricing here.
Our conclusion
Page Shield is a popular tool that takes a different approach to c/side. One that might check your compliance needs, but might not be suitable to the level of security you require.
c/side was built with a proxy service. This allows us to see the payload of the script and block any malicious activity before it loads in the browser of users.
We’ve laid out our thoughts on Jscrambler Webpage Integrity and how we compare. We’d love to chat if you have any questions or concerns.