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F5 Advanced WAF vs The Fastly Next-Gen WAF (powered by Signal Sciences) comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jan 1, 2025

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

F5 Advanced WAF
Ranking in Web Application Firewall (WAF)
3rd
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
72
Ranking in other categories
No ranking in other categories
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 F5 Advanced WAF is 3.9%, down from 8.2% 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 (%)
F5 Advanced WAF3.9%
The Fastly Next-Gen WAF (powered by Signal Sciences)1.1%
Other95.0%
Web Application Firewall (WAF)
 

Featured Reviews

reviewer2797602 - PeerSpot reviewer
Senior Security Systems Engineer at a tech services company with 11-50 employees
Granular security policies have protected critical applications and ensure safe user and admin access
Improvements could be made regarding the log information from the backend CLI. There are enhancements needed; if a request gets blocked on the TCP layer, there should be traces or data to verify which source generated these requests, including the source and port information for initiation. These data are missing from F5 Advanced WAF. Besides that, another improvement could be refining the bot detection to minimize false positives; it should be able to verify more granularly between legitimate and non-legitimate clients. Overall, I find everything else good. A wish list feature I have is for the Technical Assistance Center (TAC) to respond more promptly. Their response time needs improvement; while they do not take excessive time, it can be enhanced, especially given it is a security product.
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

"This is a good solution, it's very useful and offers easy application management, which is good to have at the perimeter level."
"I would recommend this solution to others who are interested in using it."
"The whole mechanism of F5 Advanced WAF is effective."
"This solution inspects your traffic and based on that, automatically create distinct qualities for you, so you can add this to the policy already created. That's what I like most."
"The most valuable feature of F5 Advanced WAF is its ability to mitigate attacks: DDoS and DNS, or layer seven application attacks, OWASP, and email."
"The WAF and APM are very useful, the solution has been mostly stable and reliable, and it can scale."
"The most valuable features of F5 Advanced WAF are the overall capabilities, there is not a comparable solution on the market."
"The initial setup was was easy to install."
"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."
"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."
"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."
 

Cons

"The GUI interface can be confusing due to similar-looking tabs for policy building, traffic learning, and event logs."
"F5 Advanced WAF could improve the reporting. It's a bit difficult to populate, them. If you're not so familiar with the functions, such as where to find the logs and other settings."
"The solution is pretty difficult to set up. You really have to have a grasp of the product to configure it correctly."
"For me, an area for improvement in F5 Advanced WAF is the reporting as it isn't so clear."
"The solution is tedious. It takes a lot of discrete settings so one needs to get detailed and granular when they use the solution. It takes you a whole lot of energy and concentration to configure. It needs to be much more straight-forward, like other web solutions."
"I think the price is very high. This is what I hear from the customers."
"I would like to see improved features in the F5 Advanced WAF solution, especially with a focus on enabling Kubernetes fully."
"The pricing could be more flexible."
"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."
"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."
 

Pricing and Cost Advice

"I think the price is very high."
"It is expensive. Its price should be better. Its licensing is on a yearly basis. Its licensing is also based on the model. There are no additional costs."
"The pricing is too high."
"Licensing fees for this solution are paid on a yearly basis."
"There are various plans available for Fortinet FortiWeb Cloud WAF as a Service, including a trial version."
"F5 bundles up services and the bundle is what you pay for rather than individual components."
"The pricing for F5 Advanced WAF is comparable to a Rolls-Royce. Its price is a bit high when you compare it with other vendors. F5 Advanced WAF is a bit expensive. The customer was on a three-year plan and it was around $560,000."
"F5 Advanced WAF is not a cost-effective solution. Although they are attempting to reduce prices with their VE and cloud options, they are more expensive than other solutions. The solution is more expensive on average."
"Signal Sciences is pretty cheap compared to other solutions."
"The pricing is 50% less than Akamai."
"The product has an affordable cost."
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Top Industries

By visitors reading reviews
Financial Services Firm
15%
Comms Service Provider
9%
Computer Software Company
9%
Government
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 Business27
Midsize Enterprise16
Large Enterprise31
No data available
 

Questions from the Community

What is your experience regarding pricing and costs for F5 Advanced WAF?
F5 Advanced WAF is somewhat costly compared to other vendors, but it is worth the investment due to the stability it provides to the environment and infrastructure.
What needs improvement with F5 Advanced WAF?
Improvements could be made regarding the log information from the backend CLI. There are enhancements needed; if a request gets blocked on the TCP layer, there should be traces or data to verify wh...
What is your primary use case for F5 Advanced WAF?
My main use case for F5 Advanced WAF is to protect external and internal applications from cyber attacks and to prevent malicious payloads and malicious data from reaching servers. Even if maliciou...
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

No data available
Signal Sciences Next-Gen WAF, Signal Sciences RASP
 

Overview

 

Sample Customers

MAXIMUS, Vivo, American Systems, Bangladesh Post Office, City Bank
Chef, Adobe, Datadog, Etsy, GrubHub, Vimeo, SendGrid, Under Armour, Duo, AppNexus
Find out what your peers are saying about F5 Advanced WAF vs. The Fastly Next-Gen WAF (powered by Signal Sciences) and other solutions. Updated: August 2026.
910,350 professionals have used our research since 2012.