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

Microsoft and Fastly are both solutions in the Web Application Firewall (WAF) category. Microsoft is ranked #12 with an average rating of 8.3, while Fastly is ranked #25 with an average rating of 7.3. Microsoft holds a 3.1% mindshare in WAF, compared to Fastly’s 1.2% mindshare. Additionally, 93% of Microsoft users are willing to recommend the solution, compared to 60% of Fastly users who would recommend it.

Azure Web Application Firewall

Read 16 Azure Web Application Firewall reviews

3,050 Views
2,471 Comparison Views

93% willing to recommend

The Fastly Next-Gen WAF (po...

Read 4 The Fastly Next-Gen WAF (powered by Signal Sciences) reviews

951 Views
818 Comparison Views

60% willing to recommend

Azure Web Application Firewall

The Fastly Next-Gen WAF (po...

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Executive SummaryUpdated on Jan 1, 2025

Fastly Next-Gen WAF and Azure Web Application Firewall compete in addressing web application security vulnerabilities. Fastly Next-Gen WAF shows an advantage in agility and analytics, while Azure Web Application Firewall excels in Microsoft's ecosystem integration.

Features: Fastly Next-Gen WAF provides real-time threat detection, blocking mechanisms, and customizable settings. Azure Web Application Firewall offers comprehensive integration, extensive security management features, and compatibility within Microsoft’s cloud platforms.

Ease of Deployment and Customer Service: Fastly Next-Gen WAF is praised for its quick and flexible setup, easily adapting to various environments. Azure Web Application Firewall offers seamless integration within Azure but may be less flexible for non-Azure users. Azure’s customer support is more structured, especially for existing Azure customers.

Pricing and ROI: Fastly Next-Gen WAF is cost-effective, providing quick ROI for those requiring agile solutions. Azure Web Application Firewall demands a substantial initial investment, targeting enterprises seeking extensive integration and justifying costs with long-term value from Microsoft services.

To learn more, read our detailed Azure Web Application Firewall vs. The Fastly Next-Gen WAF (powered by Signal Sciences) Report (Updated: December 2025).

Buyer's Guide

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

December 2025

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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

Azure Web Application Firewall

Ranking in Web Application Firewall (WAF)

12th

Average Rating

8.4

Reviews Sentiment

6.6

Number of Reviews

Ranking in other categories

Microsoft Security Suite (21st)

The Fastly Next-Gen WAF (po...

Ranking in Web Application Firewall (WAF)

25th

Average Rating

7.6

Reviews Sentiment

4.8

Number of Reviews

Ranking in other categories

No ranking in other categories

Mindshare comparison

As of January 2026, in the Web Application Firewall (WAF) category, the mindshare of Azure Web Application Firewall is 3.1%, down from 4.3% compared to the previous year. The mindshare of The Fastly Next-Gen WAF (powered by Signal Sciences) is 1.2%, up from 0.7% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Web Application Firewall (WAF) Market Share Distribution
Product	Market Share (%)
Azure Web Application Firewall	3.1%
The Fastly Next-Gen WAF (powered by Signal Sciences)	1.2%
Other	95.7%

Web Application Firewall (WAF)

Featured Reviews

Mano Senaratne

Head of Digital Engineering, Management Consultant at Stax Inc.

Comprehensive suite simplifies configuration while frequent updates require management

Mainly, it comes with the complete suite of Microsoft services. I can use it in conjunction with the best options and other features that come with it. Configuration is much easier than using different platforms. For example, if I have hosted the application in AWS and am using the Application Firewall from Azure, there are certain additional steps to follow when configuring them. With Microsoft, everything is within a single suite, making it easier to configure and plan. Azure continually upgrades platforms and sends us messages to upgrade to the next version, simplifying the process. Later, it's much easier if I want to upgrade the software platform, scale it, or move it to a different application host as the whole suite comes together. The return on investment is good. If I am doing applications for clients, I can invoice them for better costs. Most applications that I run and use have a better return on investment.

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reviewer2161107

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.

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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

"It's a good option if you want a solution that's ready to go and easy for your team to learn. It's cloud-based, so you don't need to buy or maintain any hardware infrastructure."

"The most valuable feature of Azure Web Application Firewall is its ability to filter requests and block false positives by using custom rules and the OWASP rule set."

"The return on investment is good."

"It has been a stable product in my experience."

"The integration it has with GitHub is great."

"We have found the most valuable features to be the web application, minimal skills required for management, control through policies, and automation."

"Azure WAF is extremely stable."

"It is almost impossible to access these assets from outside, requiring a very skilled attacker to obtain asset tokens of a customer using Azure."

More Azure Web Application Firewall pros

"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."

"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

"The pricing needs improvement, and I think for beginners it will be a little bit complicated, so the ease of use could be enhanced."

"In Brazil, we have some problems with the phone service that affect our connection with the cloud. However, it isn't common."

"The management can be improved."

"There is a need to be able to configure the solution more."

"From a reporting perspective, they could do more there."

"Azure WAF should not be deployed in the middle of the traffic."

"The knowledge base could be improved."

"I would say that Azure's customer service is not that good...I am not very happy with the support offered."

More Azure Web Application Firewall cons

"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."

"The UI is not very intuitive and could be better."

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

Pricing and Cost Advice

"We have an enterprise agreement with Microsoft and the pricing is good."

"I give the pricing a nine out of ten."

"The price of the solution depends on your architecture and how you manage it. You can control the cost in Azure quite well. The costs do not directly correlate to expenses in the features we are using."

"The price is for this solution is fair and there is a license needed."

"Azure WAF has price advantages over other WAF solutions. The pricing model is flexible because you pay on a scale based on the level of protection you need."

"The price is reasonable. It is approximately $2,000 US per month."

"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

12%

Financial Services Firm

12%

Computer Software Company

11%

Government

Manufacturing Company

12%

Computer Software Company

12%

Retailer

10%

Financial Services Firm

10%

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	6
Large Enterprise	12

No data available

Questions from the Community

What is your experience regarding pricing and costs for Azure Web Application Firewall?

I would place Azure Web Application Firewall at an eight on a scale from one to 10, with one being cheap and 10 being expensive.

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What needs improvement with Azure Web Application Firewall?

The pricing needs improvement, and I think for beginners it will be a little bit complicated, so the ease of use could be enhanced. I've worked with Fortinet and Cisco, and I think the UI is a litt...

See all answers

What is your primary use case for Azure Web Application Firewall?

Because we mostly operate in the cloud and because we're a Microsoft environment, it was the best option in the scenario. The options were limited in terms of wanting to be an only Microsoft enviro...

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What do you like most about Signal Sciences?

The product's most valuable feature is its ability to set up the rules easily.

See all answers

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.

See all answers

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.

See all answers

Comparisons

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Compared 14% of the time

Fortinet FortiWeb vs Azure Web Application Firewall

Compared 11% of the time

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Compared 9% of the time

Azure Front Door vs Azure Web Application Firewall

Compared 8% of the time

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Compared 2% of the time

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Compared 15% of the time

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Compared 14% of the time

Imperva Application Security Platform vs The Fastly Next-Gen WAF (powered by Signal Sciences)

Compared 12% of the time

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

Compared 9% of the time

Microsoft Azure Application Gateway vs The Fastly Next-Gen WAF (powered by Signal Sciences)

Compared 8% of the time

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Product Reports

Buyer's Guide

Azure Web Application Firewall

January 2026

Download Azure Web Application Firewall product report

Buyer's Guide

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

December 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

No data available

Signal Sciences Next-Gen WAF, Signal Sciences RASP

Overview

Azure Web Application Firewall (WAF) provides centralized protection of your web applications from common exploits and vulnerabilities. Web applications are increasingly targeted by malicious attacks that exploit commonly known vulnerabilities. SQL injection and cross-site scripting are among the most common attacks.

To learn more about our solution, ask questions, and share feedback, join our Microsoft Security, Compliance and Identity Community.

Microsoft

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

Information Not Available

Chef, Adobe, Datadog, Etsy, GrubHub, Vimeo, SendGrid, Under Armour, Duo, AppNexus

Buyer's Guide

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

December 2025

Free Report: Azure Web Application Firewall vs. The Fastly Next-Gen WAF (powered by Signal Sciences)

Find out what your peers are saying about Azure Web Application Firewall vs. The Fastly Next-Gen WAF (powered by Signal Sciences) and other solutions. Updated: December 2025.

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