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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 (4th)
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 April 2026, in the Internet Security category, the mindshare of Quad9 is 5.1%, down from 5.4% compared to the previous year. The mindshare of Zscaler Internet Access is 27.3%, down from 35.6% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Internet Security Mindshare Distribution
ProductMindshare (%)
Zscaler Internet Access27.3%
Quad95.1%
Other67.6%
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

"Setting up Quad9 is straightforward if you know what you're doing, and it's easy to use overall."
"The most valuable feature of Quad9 is that it is a free solution."
"The ROI of the solution is excellent."
"SSL inspection is a valuable feature."
"Zscaler Internet Access is very scalable, and requests for scalable solutions are met quickly."
"Zscaler covers all the features needed to replace a VPN or proxy solution; they are good, and they've been on the market for 15 years now, so they are mature enough."
"Zscaler Internet Access gives visibility, which is important to have, and the fact that it is usable everywhere is a significant advantage."
"Whether you are in a hotel somewhere, or in Africa, it does not matter. You will get the Zscaler protection presence anywhere."
"The most valuable features I found in Zscaler Internet Access are the restriction of users for a particular URL, the security feature related to stopping DDoS, and the VPN."
"The solution offers a distributed organization to master and to control all of the endpoints."
 

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 DLP part is quite crucial for this particular region."
"Zscaler should provide adjacent services, which would be complementary to their current offering that could to be more pragmatic for a customer. For example, if you take Akamai, you get multiple sets of services, all depending on the customer and the strategy and the complexity and the problems. In some areas, they are more varied in terms of coverage."
"Sometimes, support isn't available."
"Do not expect to pay for the service and start using it, like Gmail. Zscaler requires a proper implementation to be done to make it successful."
"I don't know whether it's Zscaler or not, however, sometimes I can't access my time management. I need to wait and try again a few hours later."
"It needs better integration with other applications. It takes a fair amount of regular activity to apply the by-passes because it is very strict in its restrictions and frequently you have to go in and open things up to allow the workforce to work."
"There are many functionalities in Zscaler Internet Access that need improvements, such as an advanced firewall and logging capabilities to track calls."
"The performance needs improvement. Some areas create performance issues and, depending on the use cases, require reconfiguration to perform again."
 

Pricing and Cost Advice

"The price of Quad9 is free."
"The tool is moderately priced."
"Zscaler is transparent about its pricing model."
"Because it's a cloud solution, we pay on a yearly basis. It is affordable and includes tech support and all features."
"The pricing is an issue. It is expensive compared to other firewalls on the market."
"The pricing for Zscaler Internet Access could be made cheaper."
"The pricing is fair based on its competitive market."
"The solution is a little bit expensive. On a scale of one to five, I would rate it as a three."
"​Be aware that you will need to invest some time and money to adapt your environment for Zscaler (traffic redirection, software deployment, authentication, etc).​"
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Top Industries

By visitors reading reviews
Comms Service Provider
24%
Computer Software Company
9%
Hospitality Company
7%
Financial Services Firm
5%
Computer Software Company
12%
Financial Services Firm
11%
Manufacturing Company
11%
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: April 2026.
886,858 professionals have used our research since 2012.