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Imperva Web Application Firewall vs The Fastly Next-Gen WAF (powered by Signal Sciences) comparison

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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

Cloudflare
Sponsored
Average Rating
8.4
Reviews Sentiment
7.2
Number of Reviews
74
Ranking in other categories
CDN (1st), Distributed Denial-of-Service (DDoS) Protection (1st), Managed DNS (1st), Cloud Security Posture Management (CSPM) (14th)
Imperva Web Application Fir...
Average Rating
8.6
Reviews Sentiment
7.1
Number of Reviews
52
Ranking in other categories
Web Application Firewall (WAF) (4th)
The Fastly Next-Gen WAF (po...
Average Rating
7.6
Reviews Sentiment
7.1
Number of Reviews
3
Ranking in other categories
Web Application Firewall (WAF) (26th)
 

Featured Reviews

Spencer Malmad - PeerSpot reviewer
It's easy to set up because you point the DNS to it, and it's working in under 15 minutes
Cloudflare is highly scalable. Cloudflare is a system with a web portal that the end users like me see. It's a console where we can adjust the DNS, caching, and security features all in that console. Cloudflare owns thousands of servers across the world that cache the data. It's a powerful solution. When clients sign up for Cloudflare, they're getting this monster content delivery network, security, and a web application firewall in one. It's all rolled into one, and it's massive. Unless you have your website hosted on a massive hosting provider, there's no way that you can deliver the amount of data that Cloudflare can provide to the end users. If you have static content, there's no way that you can ever match what Cloudflare can do. Obviously, there are competitors to Cloudflare that do the same, but I'm saying other types of solutions. Let's say you go with F5. Great, that's on-prem. That's in your colo. You can't deliver as much data to the internet as you can with a CDN. You don't have to spend $20,000 on a net scaler, F5, or whatever Cisco's selling now. You don't have to buy that. You pay them $50 a month or $150 a month. It's totally worth it because even in five years, you'll never get the performance value, not just the actual ROI. You have to consider how much throughput you can get with Cloudflare.
Abdullah Jin - PeerSpot reviewer
Offers bot protection and DDoS Protection and protects public-facing portals
Support is one thing I wish Imperva could improve. They follow the phone model and keep rotating you from one customer service person to another. The layer one support isn't very clear about the workings of the product. My feedback is primarily about Imperva Cloud, not on-premise. On-premise is a whole new story. Support is the issue for Imperva Cloud. It's also a bit pricey. It's a premium service and very expensive. The licensing model is not very straightforward. Every feature is priced separately, and to enjoy maximum protection, you'll have to spend a lot of money. The licensing model is a bit complex, and each feature is very pricey. For example, API security and web application protection are two separate license packages.
Archana Heeralal - PeerSpot reviewer
A good solution to implement web application firewall for applications
There are some lags in Signal Sciences for the web application firewalls. Even if we create some custom rules, Signal Sciences cannot capture some of the malicious traffic. There is a little bit of complexity with custom rules that should be removed. Signal Sciences should add a feature called rate limiting with multiple options, wherein I can create a rate limiting based on the cookie request or the IP.

Quotes from Members

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

Pros

"New and innovative way to protect the client's data."
"DDoS attacks target unprotected machines. Cloudflare detects and stops these attacks using internal systems. It identifies incoming DDoS attacks, issuing challenges or blocking them immediately."
"The most valuable feature of Cloudflare is the GUI. You are able to control the solution very well through the interface. There is a lot of functionality that is embedded in the service."
"The solution offers the flexibility to control configuration rules."
"There are key things that are used for our enterprise customers, such as Lambda and DNS."
"The solution is very good at mitigating threats."
"It is easier to configure and develop documentation to see how we have configured firewalls."
"We're using dynamic components to build flexible pages to create and manage Git merge requests for code and reviews."
"The solution is stable."
"Imperva is a Gartner leader, so its scalability, performance, and features are excellent."
"The valuable features of Imperva WAF include its effective security breach prevention through automatically updating rules."
"The compliance is the most valuable aspect."
"It is easy to use and has good security."
"Very scalable and very stable firewall for web applications, with a good interface in its cloud version. Mitigation is its most valuable feature. The technical support for this product is also good."
"It has fewer false positives"
"There are a number of features that are valuable such as the account takeover and various antivirus features."
"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

"Areas like how assessment, discovery, and payload are dealt with and how it all comes into your organization can be considered when trying to make suggestions to Cloudflare for improvements."
"The solution could be more user-friendly."
"There should be a specific price list for enterprise-level customers."
"If they improve on the placement of their data centers, it would be better. I'm living in a remote area. I would like to connect to them without any kind of lag."
"I believe they currently have this feature, but there will most likely be integration with APIs so we can control some features through API."
"There could be more courses with engineers. I like e-learning, however, having a specialist in a classroom is more comfortable for me."
"The integration of LLMs on the dashboard is something that is needed in the tool."
"It should have easier documentation for the configuration. It's very technical and people who aren't technical should also be able to do the configuration."
"It's a complicated tool to keep."
"They can provide an option to create reports, automatically import the entire report, and create rules again. In a real-life crisis, it would be helpful to be able to import a report and generate security rules from that report. I should be able to create a simple query and import the reports automatically. It can maybe also tell us the format of the report."
"Imperva Web Application Firewall can improve by providing better features, such as improved prevention of zero-day attacks. Additionally, it should include a VR meta-analysis."
"There could be some limitations that from the converged infrastructure perspective: when you want to converge with everything and you want Imperva to get there easily because it's not a cloud component. For example, when you want to build servers and you're using OneView to manage your software-defined networks, implementing Imperva right away is not that simple. But if you're doing just a simple cloud infrastructure with servers in there, you're good to go. Also, we are not able, with Imperva, to block by signatures. Imperva by itself needs to be complemented with another service to do URL filtering."
"It is complicated to integrate the solution's on-cloud version with other platforms."
"I'd like the option to pick your bot protection."
"Sometimes, support tickets don't get addressed quickly."
"The process to upgrade from one version to another can be a lot simpler than it is currently."
"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 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

"We don't have any issues with the price."
"It's a premium model. You can start at zero and work your way up to the enterprise model, which has a very high pricing level."
"There are no additional costs beyond the standard licensing fees."
"In terms of licensing costs, we don't pay for licensing for Cloudflare. We only establish communication, then for peering, Cloudflare takes care of the cross-connection in different data centers."
"I give the price a five out of ten."
"When you compare Cloudflare DNS to other solutions, such as Akamai, the price is reasonable."
"The solution is expensive when compared to other products but offers unlimited bandwidth."
"The price is reasonable."
"There are a couple of different licensing models."
"The solution's pricing is an issue."
"Everybody complains about the price of this solution."
"We sell three-year licenses for Imperva Web Application Firewall to our customers. The price is a little expensive."
"It's an excellent product, but it can be very costly."
"The cost of this solution depends on the platform."
"There is a license for this solution and we purchase the license annually with no additional fees."
"Make sure you understand the way that Imperva charges. It's very affordable. However, I would like to see a package with the Virtual Patching included. You get to do patching separately."
"The product has an affordable cost."
"The pricing is 50% less than Akamai."
"Signal Sciences is pretty cheap compared to other solutions."
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Top Industries

By visitors reading reviews
Educational Organization
19%
Computer Software Company
13%
Comms Service Provider
9%
Financial Services Firm
8%
Financial Services Firm
17%
Computer Software Company
13%
Insurance Company
7%
Manufacturing Company
7%
Educational Organization
19%
Computer Software Company
12%
Manufacturing Company
10%
Financial Services Firm
10%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
 

Questions from the Community

Which is the best DDoS protection solution for a big ISP for monitoring and mitigating?
Cloudflare. We are moving from Akamai prolexic to Cloudflare. Cloudflare anycast network outperforms Akamai static GR...
Which would you choose - Cloudflare DNS or Quad9?
Cloudflare DNS is a very fast, very reliable public DNS resolver. It is an enterprise-grade authoritative DNS service...
What do you like most about Cloudflare?
Cloudflare offers CDN and DDoS protection. We have the front end, API, and database in how you structure applications.
Is Citrix ADC (formerly Netscaler) the best ADC to use and if not why?
For ADC, any ADC can do a good job. But in case if you want to add WAF functionality to the same ADC hardware you hav...
DDoS solutions: Any other solutions to consider aside from Radware DDoS Protection Service and F5 Silverline DDoS Protection?
You can have a look to Imperva Cloud WAF, the anti-DDoS mitigation is under 1s and works very well. I observed a lot ...
What do you like most about Signal Sciences?
The product's most valuable feature is its ability to set up the rules easily.
What needs improvement with Signal Sciences?
Fastly don't support caching for China users. That's the only feature lacking compared to Akamai.
 

Also Known As

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

Overview

 

Sample Customers

Trusted by over 9,000,000 Internet Applications and APIs, including Nasdaq, Zendesk, Crunchbase, Steve Madden, OkCupid, Cisco, Quizlet, Discord and more.
BlueCross BlueShield, eHarmony, EMF Broadcasting, GE Healthcare, Metro Bank, The Motley Fool, Siemens
Chef, Adobe, Datadog, Etsy, GrubHub, Vimeo, SendGrid, Under Armour, Duo, AppNexus
Find out what your peers are saying about Imperva Web Application Firewall vs. The Fastly Next-Gen WAF (powered by Signal Sciences) and other solutions. Updated: April 2025.
847,772 professionals have used our research since 2012.