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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
9th
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 January 2026, in the Internet Security category, the mindshare of Quad9 is 5.4%, up from 5.0% compared to the previous year. The mindshare of Zscaler Internet Access is 29.5%, down from 36.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Internet Security Market Share Distribution
ProductMarket Share (%)
Zscaler Internet Access29.5%
Quad95.4%
Other65.1%
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
Assosiate 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."
"Zscaler Internet Access integrates effectively, especially with the high-level IP services."
"The solution is stable."
"The most valuable feature of Zscaler Internet Access is that it is a consolidated solution, it comes with many features, such as DLP."
"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."
"The cloud proxy and integration are some of the key features. Since there is cloud waste, we can quickly provision it and start working on the configuration. On top of that, they have added a few more features. They have integrated CASB, and file sandboxing is part of it."
"There is no lag in service when accessing the internet."
"The most valuable features of Zscaler Internet Access include its capacity to scale, the security implementation capabilities, the ability to integrate public IPs related to clients so traffic presents on the internet as a client, and the facility to interoperate with SSEs while maintaining the same security mechanisms from on-premises to cloud environments."
"The VPN is valuable, as the whole technology is very different from a traditional VPN."
 

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 OS capabilities and WSL support could be improved."
"In terms of user experience, it could be better."
"Zscaler Internet Access's troubleshooting is very limited, and their textbook logs need to be more informative."
"We'd like for them to include some sort of antivirus tool."
"Cloud App’s database should be improved."
"The deployment process of Zscaler Cloud Connector needs to be more user-friendly."
"One thing that needs to be improved is their presence in China. I'm not sure if that's a Zscaler thing or if it's a problem with all vendors in this space, but it would be nice to have better coverage in China. This concern is a common one for vendors across the board when dealing with the Chinese market."
"There are a few features that are not compatible with the Azure cloud."
 

Pricing and Cost Advice

"The price of Quad9 is free."
"It is costlier than other solutions."
"The tool is moderately priced."
"The pricing for Zscaler Internet Access could be made cheaper."
"Zscaler is transparent about its pricing model."
"The price of Zscaler Internet Access should improve, it is expensive."
"If we need any extra features, the price will increase."
"The price is competitive. It's not cheap and it's not expensive."
"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."
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Top Industries

By visitors reading reviews
Comms Service Provider
24%
Computer Software Company
10%
Hospitality Company
8%
Financial Services Firm
5%
Computer Software Company
13%
Manufacturing Company
11%
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 Enterprise9
Large Enterprise38
 

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: January 2026.
880,954 professionals have used our research since 2012.