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

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

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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

Featured Reviews

Spencer Malmad

Owner at Tech Exchange

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.

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Abdullah Jin

Principal Cyber Prevent and Defense Engineer at a comms service provider with 1,001-5,000 employees

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.

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Archana Heeralal

Security Engineer at Amazon

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.

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Quotes from Members

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

Pros

"The DDoS protection is the most valuable aspect of the solution."

"It is easier to configure and develop documentation to see how we have configured firewalls."

"The solution automatically detects and responds to certain types of traffic based on geolocation."

"Its ease of integration with Office 365 and the fact that it's a good product compared to what I had before"

"It's very user-friendly."

"I get a lot of value from Cloudflare's API because it enables you to build a separate environment inside the solution. You can create a domain for performing test requests before you move to the production environment and connect various domains."

"The most valuable feature of Cloudflare DNS is its global reach and it is always evolving."

"The web application firewall brought us good security and a view of the accesses/blocks of the entire domain and subdomain that were accessed both by region (country) and IPs."

More Cloudflare pros

"Its inline transferring mode is the most valuable because it is 100% transparent. When you change the IP, there is no change on the network side. If you can't and want to try to reach an IP, you can reach the server IP. There are many other advanced security features in it. The smallest appliances of Imperva can handle the highest traffic at a customer site. For example, a smaller appliance from Imperva can provide you the same security as an F5 product."

"The features I have found most valuable with Imperva Web Application Firewall are account takeover protection, advanced bot protection, and API security."

"If you are using the appliance as opposed to the virtual deployment, it can stand as the network layer-two and provide real transparency."

"It works right out of the box once you integrate the application."

"We can prevent attacks or issues even before they happen."

"The solution is cloud-based and offers us good uptime. It has combined web and API security. Therefore, with one license, you access both application security and also API security."

"Imperva WAF's strongest features are the detection of web application threats and vulnerabilities in the source code."

"It has fewer false positives"

More Imperva Web Application Firewall pros

"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."

Cons

"One area of improvement is in the Access Rules. Hypothetically, if we wanted to block or challenge traffic outside of the United States, the only way to currently do that (as far as I know) is to enter every single country outside of the United States. That could be a labor intensive job. A solution could be to enable users to create a rule where traffic is only allowed within a certain country."

"An integrated SSO feature would be useful for Cloudflare DNS."

"It would be beneficial for us if Cloudflare could offer a scrubbing solution. This would involve taking a snapshot of my website and keeping it live during a DDoS attack, ensuring uninterrupted service for our users. DDoS attacks are typically short in duration, and having Cloudflare maintain the site's availability from its secure network would enhance the overall user experience. I would appreciate it if Cloudflare could consider implementing this feature. Many organizations already utilize similar capabilities in their CDN platforms, where a static snapshot of the web page is displayed during DDoS attacks. In terms of features, Cloudflare needs to enhance its resilience and stay more focused on adopting new technologies. For instance, solutions like F5 XC Box, Access Solution, and Distributed Cloud Solution have impressive features, and Cloudflare should strive to match and exceed those capabilities. There's a need for improvement in areas like AI-based DDoS attacks and Layer 7 WAF features. Cloudflare should prioritize enhancements in areas such as behavioral DDoS and protection against SQL injection attacks, considering the prevalent trend of public exposure to the internet for business reasons. Overall, Cloudflare needs to invest more in advancing its feature set."

"Although I think it's quite good, it doesn't provide me with all the features I would expect to have if I were using Imperva."

"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."

"Cloudflare could offer a better view or maybe dashboards of the main resources used in the client."

"We're facing challenges due to an upgrade in the machine learning model. The problem arises from some users abusing the APIs, resulting in an influx of suspicious traffic. Cloudflare's learning model mistakenly identifies this traffic as human. Consequently, it assigns it a higher trust score, akin to legitimate human traffic, causing complications in our architecture. Previously, such traffic would have been categorized as suspicious, enabling us to apply appropriate blocking rules. However, we encounter difficulties distinguishing between genuine and suspicious traffic with the new categorization. Despite these challenges, overall, Cloudflare remains the preferred solution compared to Azure, AWS CloudFront, and Google Cloud Armor."

"We are a product integrator and reseller, and we would like to have a better partner relationship, similar to a channel sales relationship. Sometimes we are on our own or get diverted by Cloudflare because they have direct sales, which competes with us and makes it difficult to build a relationship with this company since we want to be an MSP or a managed service provider for the solution."

More Cloudflare cons

"Imperva Web Application Firewall could improve the console by making it easier to use."

"One potential improvement for Imperva is enhancing its alert system."

"The signature updates could be faster. Sometimes we have to upload signatures to the Imperva portal for checking and analysis before we can use them."

"Their portal is very limited and needs improvement."

"There is nothing specific where the application firewall is falling short."

"They recently separated the WAF and the DAM management gateways in order for each of these to be managed from different areas, so I believe it now requires additional investments for what was previously a single complete solution."

"Imperva Web Application Firewall is a good system, but we found that the visibility of the diverse-path server, e.g. where the traffic is coming from, the different IPs, etc., needs improvement."

"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."

More Imperva Web Application Firewall cons

"Even if we create some custom rules, Signal Sciences cannot capture some of the malicious traffic."

"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."

"Fastly don't support caching for China users. That's the only feature lacking compared to Akamai."

Pricing and Cost Advice

"The price is reasonable."

"The solution has many features but there are ones that you need to pay for. Sometimes you have to find out which is available for free and which you have to pay for."

"When you compare Cloudflare DNS to other solutions, such as Akamai, the price is reasonable."

"I believe their performance has improved, but I'd like to refrain from discussing the pricing aspect related to the cloud. The pricing, in my opinion, could be simplified, and I think they should consider reevaluating the pricing for support, as it can be quite high. At times, this cost can make it challenging to choose CARFAGuard or opt for the support."

"We are using the free version."

"We don't have any issues with the price."

"So far I use free tier and happy with it. You can subscribe to business package if needed."

"I think the pricing is competitive. I think as far as licensing is concerned it's pretty straightforward because it's based on domain. It's just that sometimes domains could be tricky with some customers."

More Cloudflare pricing and cost advice

"The tool is expensive."

"It's an excellent product, but it can be very costly."

"The cost of this solution depends on the platform."

"The pricing is somewhat expensive. It is actually a huge investment when compared to other countries."

"The price of Imperva Web Application Firewalls is expensive compared to others."

"Imperva Web Application Firewall is expensive."

"Imperva’s pricing is a bit higher in the market since it offers a full-blown WAF."

"The price is high compared to other solutions like FortiWeb."

More Imperva Web Application Firewall pricing and cost advice

"The pricing is 50% less than Akamai."

"Signal Sciences is pretty cheap compared to other solutions."

"The product has an affordable cost."

See which vendors are best for you

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849,686 professionals have used our research since 2012.

Top Industries

By visitors reading reviews

Educational Organization

17%

Computer Software Company

14%

Comms Service Provider

Financial Services Firm

17%

Computer Software Company

13%

Insurance Company

Manufacturing Company

Educational Organization

18%

Computer Software Company

12%

Manufacturing Company

11%

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.

Which is the best DDoS protection solution for a big ISP for monitoring and mitigating?

My recommendation is Imperva.

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 is your experience regarding pricing and costs for Signal Sciences?

The pricing is 50% less than Akamai.

What needs improvement with Signal Sciences?

Fastly don't support caching for China users. That's the only feature lacking compared to Akamai.

Azure Front Door vs Cloudflare

Comparisons

Quad9 vs Cloudflare

Compared 50% of the time

Akamai vs Cloudflare

Compared 4% of the time

Compared 3% of the time

Azure DNS vs Cloudflare

Compared 3% of the time

Imperva DDoS vs Cloudflare

Compared 2% of the time

More Cloudflare Competitors

Microsoft Azure Application Gateway vs Imperva Web Application Firewall

Compared 15% of the time

F5 Advanced WAF vs Imperva Web Application Firewall

Compared 13% of the time

Azure Front Door vs Imperva Web Application Firewall

Compared 11% of the time

AWS WAF vs Imperva Web Application Firewall

Compared 9% of the time

Azure Web Application Firewall vs Imperva Web Application Firewall

Compared 3% of the time

More Imperva Web Application Firewall Competitors

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

Compared 18% of the time

Azure Front Door vs The Fastly Next-Gen WAF (powered by Signal Sciences)

Compared 13% of the time

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

Compared 12% of the time

Akamai App and API Protector vs The Fastly Next-Gen WAF (powered by Signal Sciences)

Compared 10% of the time

Prisma Cloud by Palo Alto Networks vs The Fastly Next-Gen WAF (powered by Signal Sciences)

Compared 7% of the time

More The Fastly Next-Gen WAF (powered by Signal Sciences) Competitors

Product Reports

Cloudflare

Download Cloudflare product report

Imperva Web Application Firewall

Download Imperva Web Application Firewall product report

Web Application Firewall (WAF)

March 2025

The Fastly Next-Gen WAF (powered by Signal Sciences) report

Download The Fastly Next-Gen WAF (powered by Signal Sciences) product report

Also Known As

Cloudflare DNS

No data available

Signal Sciences Next-Gen WAF, Signal Sciences RASP

Overview

Cloudflare is a highly-regarded Content Delivery Network (CDN) and a Distributed Denial-of-Service (DDoS) protection solution. The robust global connectivity cloud platform that is Cloudflare ensures users are able to connect to the Internet quickly, securely, and reliably. Cloudflare is one of the world's largest networks in the marketplace today. Using Cloudflare, businesses, educational entities, NGOs, vloggers, bloggers, and anyone else with an internet presence can experience more secure, faster websites and applications.

Currently, there are millions of Internet locations on Cloudflare, and the Cloudflare network
continues to grow every day by the thousands. The solution is able to fulfill the requests for
millions of websites seamlessly and serves on average 45 million HTTP requests per second.

Cloudflare has safe, secure data centers in close to 300 cities worldwide to ensure every
client request is filled as quickly as possible. It is Cloudflare’s edge network that makes this
possible by keeping content and other services as close to each client as possible, so the
information requests are always only seconds away.

Many organizations that work in democracy, civil society, human rights, or the arts are able to
access Cloudflare's highest levels of protection for free via Project Galileo. Additionally, official
election websites can be secured from hacking and fraud through Cloudflare’s Project
Athenian, also at no additional cost.

Cloudflare can also help organizations of all sizes develop a robust zero-trust strategy to
ensure the highest levels of productivity and profitability. Employees, stakeholders, and end users have a greater level of satisfaction and overall improved user experience, which can, in
turn, result in higher revenues and overall ROI. Zero-trust and BYOD (bring your own device)
access ensure end users and employees always have the best resources and technology
available to them at all times.

Cloudflare benefits

Cloudflare has many benefits. Some of its most valuable benefits include:

- Faster load times

- Robust DNS security

- Intuitive cloud Web Application Firewall (WAF)

- Free universal SSL

- Image enhancement

- Automatic browser caching

- Next-generation cloud load balancer

- Accelerated Mobile Pages (AMP)

- Rate limiting

- Minification

- Zero-trust capabilities

- Cost-effective

- Reduced carbon footprint

Reviews from real users

“Many websites require an SSL certificate because they sell stuff and want SSL. Cloudflare
comes with an SSL certificate built in. It's automatic. You sign yourself up for Cloudflare, and
an SSL certificate automatically protects your website. If you have a connection between your
website and your host, the server, Cloudflare, and the host, you don't necessarily need a
certificate.” Spencer M., Owner at Tech Exchange

“What I like best about Cloudflare is that my company can use it to trace and manage
applications and monitor traffic. The solution tells you if there's a spike in traffic. Cloudflare
also sends you a link to check your equipment and deployment and track it through peering,
so it's a valuable tool.” Daniel P., Network Engineer at Ufinet

“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.” PeerSpot user, Competence Center Manager at a tech services company

Cloudflare

Imperva Web Application Firewall is a versatile solution that protects web applications and databases from various attacks, including DDoS, cross-site scripting, and SQL injection attacks. It offers data security, availability, and access control and can be deployed on-premises or on the cloud.

The solution has good security against web attacks and offers advanced bot protection, API security, and mitigation features. Imperva WAF is easy to configure and deploy; it has good customer service and an excellent user interface.

Imperva

The Fastly Next-Gen WAF (powered by Signal Sciences) provides web application and API protection, RASP, rate limiting, bot protection and DDoS purpose built to eliminate the challenges of legacy WAF.

Fastly

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

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