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Quad9 vs Zscaler Internet Access comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Jun 3, 2026

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
6th
Average Rating
6.0
Reviews Sentiment
7.9
Number of Reviews
2
Ranking in other categories
Managed DNS (4th)
Zscaler Internet Access
Ranking in Internet Security
2nd
Average Rating
8.4
Reviews Sentiment
6.7
Number of Reviews
60
Ranking in other categories
Secure Web Gateways (SWG) (3rd)
 

Mindshare comparison

As of July 2026, in the Internet Security category, the mindshare of Quad9 is 4.9%, down from 5.8% compared to the previous year. The mindshare of Zscaler Internet Access is 26.6%, down from 33.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Internet Security Mindshare Distribution
ProductMindshare (%)
Zscaler Internet Access26.6%
Quad94.9%
Other68.5%
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."
"It's easy to deploy and easy to use."
"Zscaler has helped protect our employees wherever they are working, by delivering safe web access."
"Whether you are in a hotel somewhere, or in Africa, it does not matter. You will get the Zscaler protection presence anywhere."
"Zscaler Internet Access is less expensive than competitors like Palo Alto, offering a premium service justified by security enhancements and cost-effective scalability."
"The solution is stable and reliable."
"The solution offers a distributed organization to master and to control all of the endpoints."
"The most valuable features of Zscaler Internet Access are it's on the cloud, high network performance, and the interception of users is very easy."
"Zscaler excels in security protection and the cloud is always up-to-date. It does not matter if you are a small or big organisation, you will receive the same security quality."
 

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 response time and engagement model for technical support could be improved to handle complex outages more efficiently."
"Regarding improvements in Zscaler Internet Access, the admin console can sometimes be slow, particularly when navigating through reports or policy configuration."
"With the pricing structure that they currently have, it is only for big customers."
"The performance needs improvement. Some areas create performance issues and, depending on the use cases, require reconfiguration to perform again."
"Zscaler is one solution. It's a good solution, but it doesn't do everything."
"The deployment process of Zscaler Cloud Connector needs to be more user-friendly."
"In terms of usage, here in the GCC, it's still growing a growing market, so the combination of DLP, data leak prevention, to a certain extent is fine. But what it requires is user-based access or role-based access. The solution needs to grow into that, which definitely takes time. There's not an easy way to integrate it, when you have a cloud-based solution."
"The solution is expensive. They recently revised the pricing and packaging. Some of our existing customers have been asking for alternate solutions for a lower price."
 

Pricing and Cost Advice

"The price of Quad9 is free."
"Zscaler is an expensive solution, but it's worth the price. Their services are unmatched by competitors. Some may come with half the features that Zscaler can offer and be much cheaper. However, they do not have the global coverage that Zscaler has, and they will not provide the same low latencies and the same speeds that Zscaler can."
"ZIA follows a subscription model pricing and charges you based on the number of users. I would say its price is good."
"Zscaler is transparent about its pricing model."
"The tool is moderately priced."
"The solution is a little bit expensive. On a scale of one to five, I would rate it as a three."
"We have found the solution to be expensive."
"If we need any extra features, the price will increase."
"Licenses are available on a per-host basis. Some features like sandboxing require an additional fee, but most standard features are included in the license."
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Top Industries

By visitors reading reviews
Comms Service Provider
26%
Computer Software Company
8%
Hospitality Company
6%
Government
5%
Financial Services Firm
12%
Computer Software Company
10%
Manufacturing Company
10%
Retailer
6%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business17
Midsize Enterprise9
Large Enterprise39
 

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?
We have not purchased Zscaler Internet Access through the AWS Marketplace; the licensing process was handled separately by our financial and management team.
 

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: June 2026.
907,372 professionals have used our research since 2012.