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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 (3rd)
Zscaler Internet Access
Ranking in Internet Security
2nd
Average Rating
8.2
Reviews Sentiment
7.0
Number of Reviews
52
Ranking in other categories
Secure Web Gateways (SWG) (2nd)
 

Mindshare comparison

As of April 2025, in the Internet Security category, the mindshare of Quad9 is 5.4%, up from 3.5% compared to the previous year. The mindshare of Zscaler Internet Access is 35.6%, up from 35.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Internet Security
 

Featured Reviews

Benoit Tellier - PeerSpot reviewer
No maintenance required, free service, but more free features would help
We were using Quad9 to prevent our users from accidentally landing on suspicious websites There's no reporting, but we're hoping that our users have been able to avoid malicious websites. The most valuable feature of Quad9 is that it is a free solution. Quad9 could improve by having any…
ShanavasVK - PeerSpot reviewer
Helps maintain a consistent posture of internet security while getting rid of VPN and hovering into zero trust
There could be a better way for the tool to categorize the traffic. For example, the tool does exceptions and everything overall. If I want to give guest access or provide access to guest users or any other internet access and if it does not go through the SSL inspection because, in our company, we can't have the root certificate on a device that we don't manage, which can be called out as an exception or an exclusion, but that doesn't provide a proper reflection of the picture of what is happening in the environment. There are granularities bringing it down. The tool I used or still have is Zscaler Cloud Connector to protect the cloud environment, which can have a bit more user-friendly installation and setup, and it would help a lot. The deployment process of Zscaler Cloud Connector needs to be more user-friendly. Improvements are required in the exception category. For example, suppose I report on a monthly basis what the breaches and traffic violating the SSL inspection area are coming from. In that case, I may find that half of them may be coming through some guest network, meaning the tool doesn't differentiate between the guest or normal networks or the corporate networks. Having options to differentiate different networks would be ideal so that it can show a true picture of things to users, as half of the things in the tool are not in our control and are not of our concern.

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."
"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."
"In terms of management and visibility, there is a single panel where you can configure the policies for your entire organisation worldwide."
"The most valuable feature of Zscaler Internet Access is that it is a consolidated solution, it comes with many features, such as DLP."
"We like Zscaler's traffic filtering, web security, DLP, and IPS features. The real-time threat protection is excellent."
"The solution has reduced cyberattacks."
"We enjoy all of the proxy capabilities and the capability to integrate into the SIEM/SOC solution."
"The security is excellent."
"The solution replaces multiple vendor technologies with one which makes it worth the cost."
 

Cons

"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."
"Quad9 could improve by having more free features, such as custom DNS filtering."
"The pricing is an issue. It is expensive if you have all of your users in the same location. It is expensive compared to other firewalls on the market."
"It also needs better integration with other applications as well. There are some restrictions."
"There are many functionalities in Zscaler Internet Access that need improvements, such as an advanced firewall and logging capabilities to track calls."
"Cloud App’s database should be improved."
"The solution's technical support needs to be improved, especially by offering a better support structure for different geographical areas."
"We'd like for them to include some sort of antivirus tool."
"Zscale is providing a proxy IP, and most government sites will block traffic from a proxy. Also, we see some performance issues on the cloud side during DC failover."
"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."
 

Pricing and Cost Advice

"The price of Quad9 is free."
"Because it's a cloud solution, we pay on a yearly basis. It is affordable and includes tech support and all features."
"Zscaler is transparent about its pricing model."
"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."
"We have found the solution to be expensive."
"​Be aware that you will need to invest some time and money to adapt your environment for Zscaler (traffic redirection, software deployment, authentication, etc).​"
"ZIA follows a subscription model pricing and charges you based on the number of users. I would say its price is good."
"The solution is a little bit expensive. On a scale of one to five, I would rate it as a three."
"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
Computer Software Company
18%
Comms Service Provider
18%
Hospitality Company
7%
Media Company
6%
Educational Organization
24%
Computer Software Company
13%
Financial Services Firm
9%
Manufacturing Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
 

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 ...
What do you like most about Quad9?
Setting up Quad9 is straightforward if you know what you're doing, and it's easy to use overall.
What needs improvement with Quad9?
We've had performance problems with Quad9. It isn't responding fast enough.
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....
 

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 2025.
845,040 professionals have used our research since 2012.