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Quad9 vs Zscaler Internet Access 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

Quad9
Ranking in Internet Security
8th
Average Rating
6.0
Reviews Sentiment
7.9
Number of Reviews
2
Ranking in other categories
Managed DNS (5th)
Zscaler Internet Access
Ranking in Internet Security
2nd
Average Rating
8.4
Reviews Sentiment
6.6
Number of Reviews
59
Ranking in other categories
Secure Web Gateways (SWG) (3rd)
 

Mindshare comparison

As of March 2026, in the Internet Security category, the mindshare of Quad9 is 4.9%, down from 5.2% compared to the previous year. The mindshare of Zscaler Internet Access is 28.8%, down from 35.7% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Internet Security Mindshare Distribution
ProductMindshare (%)
Zscaler Internet Access28.8%
Quad94.9%
Other66.3%
Internet Security
 

Featured Reviews

Louis Geoffroy - PeerSpot reviewer
President at IDEBUG
It's easy to use and set up, but I've faced performance problems
I have experience with Quad9 and most other filtering solutions. Quad9 was working well initially, but it started slowing, so I switched to OpenDNS. I recently checked Tom's Hardware, an IT review site, and read a review of seven DNS filters. Open DNS was ranked the fastest, and Quad9 was second. Google was on there too, but they said it didn't filter enough.
Mohan Janarthanan - PeerSpot reviewer
Associate Vice President at Novac Technology Solutions
User access management and threat prevention are enhanced with user-friendly controls
The best features Zscaler Internet Access offers include application control, tenant segregation, and PoP center regions which have low availability zones. The internet access is very successful and bandwidth speed is excellent. It also has application-based control, URL-based control, and SSL inspection capabilities, which are very useful. Additionally, the in-depth CASB segregation is very beneficial to us. One unique feature I found helpful is the tenant level restrictions, which we use to only access our organization's tenant level mail IDs, drives, and specific tenant level access while restricting public access. Zscaler Internet Access has positively impacted our organization as we have noticed substantial outputs and income. It has improved our security environment control and endpoint protection. It prevents numerous web attacks through its AI/ML incorporated capability which identifies malware, threats, and viruses. It has a toggle button to enable features entirely at the tenant level for all users onboarded into Zscaler Internet Access, resulting in much better outcomes.

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 feature of Quad9 is that it is a free solution."
"Setting up Quad9 is straightforward if you know what you're doing, and it's easy to use overall."
"I would recommend Zscaler Internet Access due to its ease of use and deployment, with a user-friendly interface."
"The solution's most valuable features are its reliability and availability, measured by the number of ports it offers."
"The solution replaces multiple vendor technologies with one which makes it worth the cost."
"Zscaler Internet Access's best feature is the granular policy controls."
"In terms of management and visibility, there is a single panel where you can configure the policies for your entire organisation worldwide."
"The solution is scalable and stable."
"Zscaler Internet Access gives visibility, which is important to have, and the fact that it is usable everywhere is a significant advantage."
"We like Zscaler's traffic filtering, web security, DLP, and IPS features. The real-time threat protection is excellent."
 

Cons

"Quad9 could improve by having more free features, such as custom DNS filtering."
"It used to work fine for all the devices, but it started to slow and become non-responsive. I would have to reload the page two or three times before all the pages loaded. With OpenDNS, I only need to load the page once."
"The performance needs improvement. Some areas create performance issues and, depending on the use cases, require reconfiguration to perform again."
"The response time and engagement model for technical support could be improved to handle complex outages more efficiently."
"Zscaler Internet Access can improve by adding traffic filtering based on the DNS."
"The OS capabilities and WSL support could be improved."
"Another thing that I would like to see is if Zscaler could have a separate product for direct access. I looked at a private access solution, but I understand there's a separate product that isn't integrated with this."
"We'd like to have more plugins and integration."
"There are some performance issues when we add on additional controls."
"There are many functionalities in Zscaler Internet Access that need improvements, such as an advanced firewall and logging capabilities to track calls."
 

Pricing and Cost Advice

"The price of Quad9 is free."
"Roughly, we might spend $70,000 a month on the solution. We don't pay for anything beyond the standard licensing fee."
"Price-wise, the tool is reasonable compared to the other products in the market but it is not a very low-priced tool. The solution does provide value for money."
"The pricing is fair based on its competitive market."
"Zscaler is transparent about its pricing model."
"Our monthly fee is around R3000."
"​Be aware that you will need to invest some time and money to adapt your environment for Zscaler (traffic redirection, software deployment, authentication, etc).​"
"It is a few pounds per user per month."
"The price of Zscaler Internet Access should improve, it is expensive."
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Top Industries

By visitors reading reviews
Comms Service Provider
25%
Computer Software Company
9%
Hospitality Company
7%
Government
5%
Computer Software Company
12%
Manufacturing Company
10%
Financial Services Firm
10%
Comms Service Provider
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business17
Midsize Enterprise10
Large Enterprise37
 

Questions from the Community

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 that offers great redundancy and advanced security with built-in unmetered and ...
Which is the better security solution - Cisco Umbrella or Zscaler?
Cisco Umbrella and Zscaler Internet Access are two broad-spectrum Internet security solutions that I have tried. Zscaler Internet Access is a good option for carrying out multiple security functi...
Which is better, Zscaler internet access or Netsckope CASB?
We researched Netskope but ultimately chose Zscaler. Netskope is a cloud access security broker that helps identify and manage cloud applications, protecting your sensitive data from exfiltration....
What is your experience regarding pricing and costs for Zscaler Internet Access?
It is only for big companies currently and they only focus on that. That is one of the problems to get into the market. Of course, it is an expensive product.
 

Also Known As

No data available
ZIA
 

Overview

 

Sample Customers

CISCO, Netlab, proofpoint
Ulster-Greene ARC, BanRegio, HDFC, Ralcorp Holdings Inc., British American Tobacco, Med America Billing Services Inc., Lanco Group, Aquafil, Telefonica, Swisscom, Brigade Group
Find out what your peers are saying about Quad9 vs. Zscaler Internet Access and other solutions. Updated: March 2026.
884,873 professionals have used our research since 2012.