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NetScaler vs The Fastly Next-Gen WAF (powered by Signal Sciences) comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Mar 1, 2026

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Categories and Ranking

NetScaler
Ranking in Web Application Firewall (WAF)
25th
Average Rating
8.4
Reviews Sentiment
7.0
Number of Reviews
107
Ranking in other categories
Application Delivery Controllers (ADC) (5th), Network Management Applications (17th)
The Fastly Next-Gen WAF (po...
Ranking in Web Application Firewall (WAF)
33rd
Average Rating
7.6
Reviews Sentiment
4.8
Number of Reviews
4
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of August 2026, in the Web Application Firewall (WAF) category, the mindshare of NetScaler is 3.0%, down from 3.7% compared to the previous year. The mindshare of The Fastly Next-Gen WAF (powered by Signal Sciences) is 1.1%, up from 0.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Web Application Firewall (WAF) Mindshare Distribution
ProductMindshare (%)
NetScaler3.0%
The Fastly Next-Gen WAF (powered by Signal Sciences)1.1%
Other95.9%
Web Application Firewall (WAF)
 

Featured Reviews

MP
Senior Data Center Engineer at Axians
Load balancing and secure access have supported complex migrations and automation at scale
NetScaler has positively impacted my organization because I work for a system integrator and deploy it for customers. Many customers are really happy with NetScaler, except for the pricing, as Citrix has changed a lot of their pricing in the last two or three years when they transitioned to Cloud Software Group. However, despite that, I know customers are really satisfied with the technical capabilities that NetScaler provides. While I do not have specific outcomes or metrics from my customers, I think using Core Logic has made it much easier for the big municipality I mentioned to implement NetScaler as a total solution, thus speeding up their automation. There are likely many benefits, but I lack benchmarks or timing figures to quantify that.
reviewer2161107 - PeerSpot reviewer
Staff Engineer at a retailer with 1,001-5,000 employees
Room for improvement with user interface while competitive pricing impresses
It is managed through Infrastructure as Code, so all configurations can be managed in the code itself, which is beneficial. Because it uses rules, it is easy to set up, and we have many different sites where the configurations are straightforward. Though the UI is not very interactive, which is a downside, we can manage many things. The UI is not very intuitive and could be better. However, we manage all the configurations through code, which is easy to maintain. It has extensive anomaly detection capabilities, so the traffic is classified into several categories where thresholds can be defined and customized based on false positives and false negatives. This is advantageous because you do not need to tweak it very often. Once you set it up, an audit once a quarter would suffice. Because The Fastly Next-Gen WAF (powered by Signal Sciences) is API-driven, we have integrations with the CI/CD pipeline through GitHub Actions, making it easy to integrate.

Quotes from Members

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Pros

"The most valuable features of Citrix ADC are load balancing and application firewall."
"This solution can be deployed on-premises, public cloud, and private cloud; it's hybrid, it's a good product and I recommend it."
"I find all of it to be valuable, because of the flexibility that is built into this product."
"It was very easy, the NetScaler community is very big."
"I would say the rewriting and redirection functions are must-have's for us."
"The most valuable feature is the SSL VPN."
"Once you set it up correctly you never have to go back to change anything ever again."
"Allows the user to easily scale out application delivery. Provides secure remote access. Ease of management and business continuity support. Powerful, reliable, and feature rich solution all in one appliance."
"Because The Fastly Next-Gen WAF (powered by Signal Sciences) is API-driven, we have integrations with the CI/CD pipeline through GitHub Actions, making it easy to integrate."
"Fastly (Signal Sciences) integrates and tags the intermittent traffic based on patterns. It generates signals and provides them in a dashboard where we can view them and decide whether to allow or deny traffic. It's a more advanced and easy-to-navigate dashboard."
"The product's most valuable feature is its ability to set up the rules easily."
"When configuring a web application firewall using Signal Sciences, we configure a rule whereby no one except a few people can access the application."
 

Cons

"Scripting and writing expressions need to be improved by putting logic behind the rules and improve policies involving some of the scripting part, which is a tedious task to do."
"Citrix ADC can be really complex. It isn't very simple like some other appliances that I've worked with. You need a lot of skill and experience to manage it. I'm not talking about a year or two. You need at least four years to understand it very well. It is not that easy to learn. They should make it a lot simpler for users to understand the management of it. They can also provide some additional training. The material they have on the site is not sufficient enough for you to understand how to manage it. Their training is expensive, and not everyone has the funds and experience for it. Citrix isn't very popular around these parts of the world. So, it can use some more marketing, sales, enlightenment, and advertisement. These could bring more market for them. Basically, there are just a few companies that really go for Citrix. Most of the companies go for VMware because they marketed themselves more than Citrix. There isn't much difference between Citrix and VMware. VMware is a little more robust than Citrix. Citrix has focused more on desktops rather than server virtualization, and that's the advantage VMware has over Citrix. Citrix also needs to educate and inform users about the infrastructure that is supported with a version. Currently, if the customers don't look at the datasheet, they might miss this important information."
"The web management console uses a Java plugin. Some improvements are needed on the web management console."
"There are specific features that we like but are not available at our licensing level."
"I feel that Citrix NetScaler's customer support needs to improve."
"The solution is a bit more expensive than some of the available solutions in this region. One solution in particular that I noticed was cheaper was Kemp."
"We are looking for some in-depth monitoring and analytics and more information that Citrix Director doesn't provide."
"The WAF component needs to be simplified so that it is easier to use."
"The UI is not very intuitive and could be better."
"The areas that could be improved in Signal Sciences include the effectiveness of rules, as many didn't function optimally and required custom rule-writing to address bypasses for WAF."
"Even if we create some custom rules, Signal Sciences cannot capture some of the malicious traffic."
"Fastly don't support caching for China users. That's the only feature lacking compared to Akamai."
 

Pricing and Cost Advice

"The license for Citrix NetScaler is on an annual basis and it is reasonably priced."
"Citrix ADM costs us approximately $5000 per month."
"Its licensing cost is much higher than other products, but it is acceptable because it is a one-time investment, and we are getting our requirements fulfilled when we buy this product. So, there is no issue with the pricing."
"It is an enterprise solution. Thus, its costs are reasonable."
"In Turkey, everything is good, but it seems expensive for us due to the currency exchange. I don't have a specific rating scale, but if I had to rate the price, I would say it's around a six out of ten."
"The solution is expensive compared to one of its competitors."
"Ninety day free trial makes it easy to try out this solution."
"F5 BIG-IP is much more expensive than Citrix ADC. For example, If we choose two platforms, Citrix ADC, 3000 version, and we choose F5, F4200 version. F5 BIG-IP has connections, timers, and throughput similar to Citrix ADC, but the price is very expensive."
"The pricing is 50% less than Akamai."
"Signal Sciences is pretty cheap compared to other solutions."
"The product has an affordable cost."
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Top Industries

By visitors reading reviews
Manufacturing Company
9%
Financial Services Firm
9%
Construction Company
8%
Comms Service Provider
8%
Manufacturing Company
10%
Retailer
9%
Financial Services Firm
8%
Comms Service Provider
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business44
Midsize Enterprise24
Large Enterprise59
No data available
 

Questions from the Community

What advice do you have for others considering Citrix NetScaler?
Each product has its advantages, and combining certain features of F5 and NetScaler could be beneficial. I'd rate the solution eight out of ten.
What is your experience regarding pricing and costs for Citrix ADM?
Regarding pricing, educational institutes often receive better prices. In the context of virtualization, prices are increasing, affecting small to medium businesses in Israel.
What needs improvement with Citrix Web App and API Protection?
The configuration is complex, and only one or two people know how to assist when problems arise. It would be beneficial if F5 and NetScaler could be combined.
What is your experience regarding pricing and costs for Signal Sciences?
The pricing is very competitive compared to other providers. The pricing is definitely a factor in our decision-making process.
What needs improvement with Signal Sciences?
We do use it, but the UI can be improved as we mostly work through the CI/CD. It provides support, but sometimes it is hard to navigate unless you are very familiar with it.
What is your primary use case for Signal Sciences?
The CDN is for caching and The Fastly Next-Gen WAF (powered by Signal Sciences) is for protecting the servers from malicious traffic. They both perform different jobs and serve different purposes, ...
 

Also Known As

Citrix ADC, Citrix NetScaler VPX, NetScaler Console, NetScaler Web Application Firewall, NetScaler VPX - Customer Licensed
Signal Sciences Next-Gen WAF, Signal Sciences RASP
 

Overview

 

Sample Customers

ABB Schweiz, Aer Lingus, AIDS Healthcare Foundation, Amnet Technology Solutions, Aramex International, Ascenty, Atos, Autodesk
Chef, Adobe, Datadog, Etsy, GrubHub, Vimeo, SendGrid, Under Armour, Duo, AppNexus
Find out what your peers are saying about NetScaler vs. The Fastly Next-Gen WAF (powered by Signal Sciences) and other solutions. Updated: August 2026.
909,725 professionals have used our research since 2012.