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Fortinet FortiOS vs Zscaler Cloud Firewall comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Sep 16, 2024

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
6.3
Fortinet FortiOS offers cost-effective, scalable security, with competitive pricing and partnerships, enhancing ROI compared to top brands.
Sentiment score
4.8
Zscaler Cloud Firewall enhances global security and efficiency with comprehensive features, delivering 60% savings in time and costs.
Once it is deployed, I do not have to revisit or replace the hardware.
Network Administrator at a educational organization with 501-1,000 employees
The pricing of FortiOS is competitive and reasonable compared to other leading products such as Palo Alto and Check Point.
Senior Manager at ITX360 (Pvt) Ltd
Fortinet is strong in terms of cost and compatibility with other vendors.
Technology Consultant at 1ware
I have seen a return on investment with time saving and money saving.
Senior Devsecops Cloud Cybersecurity Specialist at CGI
 

Customer Service

Sentiment score
8.2
Fortinet FortiOS support is responsive and helpful but sometimes slow with complex issues, lacking top-tier vendor standards.
Sentiment score
5.5
Zscaler Cloud Firewall support is generally helpful and responsive but may sometimes lack adequacy for premium expectations.
I would rate them nine or ten out of ten.
Technology Consultant at 1ware
Fortinet technical support is very responsive and helpful.
Senior Manager at ITX360 (Pvt) Ltd
Support engineers sometimes lack eagerness to assist with issues such as the memory problem.
Director, IT Infrastructure Department at Zemen Bank S.C.
The response and support are sometimes inadequate, which detracts from the overall experience of an otherwise impressive solution.
Director at Aquila ICT Solutions
The technical support from Zscaler was excellent.
Cyber Security Architect at Accenture
 

Scalability Issues

Sentiment score
8.2
Fortinet FortiOS is highly scalable, adapting to different organizations, supporting growth and global deployments, yet may need hardware upgrades.
Sentiment score
5.7
Zscaler Cloud Firewall offers excellent scalability, supporting diverse organizations smoothly, with most users rating it between seven and ten.
When customers' networks grow and needs expand, we can easily switch between models to trade up devices.
Technology Consultant at 1ware
It allows for the expansion of users and devices without additional licensing costs.
Senior Manager at ITX360 (Pvt) Ltd
We have been using Fortinet for bandwidth shaping and many other bandwidth-related functions.
Associate Director IT Operations at Procento
In this case, Twingate will be very easy compared to Zscaler.
IT Security at a manufacturing company with 11-50 employees
 

Stability Issues

Sentiment score
7.8
Fortinet FortiOS is praised for stability, with minor issues usually tied to configurations or external factors, not the system.
Sentiment score
7.2
Zscaler Cloud Firewall is highly rated for stability and reliability despite minor latency and GUI lag issues.
While the product is largely stable, it sometimes faces memory issues in specific versions like 11 OE, which can be disruptive.
Director, IT Infrastructure Department at Zemen Bank S.C.
There were no lags, there were no issues, and no hanging of the firewall.
Associate Director IT Operations at Procento
Stability is a seven out of ten because during version migrations, and sometimes with new versions, Fortinet is not as good.
Technology Consultant at 1ware
There were some stability issues due to occasional latency and lags, particularly with the GUI and report generation.
Cyber Security Architect at Accenture
 

Room For Improvement

Fortinet FortiOS requires improvements in VPN, pricing, compatibility, UI, security features, support, updates, deployment, and pricing consistency.
Zscaler Cloud Firewall needs deployment, support, features, UI, pricing, integration, and dashboard improvements for optimal performance and usability.
Fortinet FortiOS faces memory issues, which can lead to unexpected downtimes.
Director, IT Infrastructure Department at Zemen Bank S.C.
There should be more documentation on how to use the CLI or how to perform CLI versions of tasks that can be done through the GUI.
Network Administrator at a educational organization with 501-1,000 employees
Compared to other market leaders like Palo Alto and Check Point, FortiOS has many bugs in its initial releases.
Senior Manager at ITX360 (Pvt) Ltd
For now, there is no dashboard or network management system available for Twingate.
IT Security at a manufacturing company with 11-50 employees
The reverse proxy feature for Data Loss Prevention (DLP) is missing.
Cyber Security Architect at Accenture
I believe the integration of AI could improve the dashboard by making it more agile and effective in monitoring and predicting threats.
Director at Aquila ICT Solutions
 

Setup Cost

Fortinet FortiOS is often pricey but justified by features, with agreements influencing costs, suitable for mid-size businesses.
Zscaler Cloud Firewall has subscription pricing influenced by user count and features, making it costlier than some competitors.
It is an affordable solution for us.
Technology Consultant at 1ware
Fortinet products are somewhat pricey, similar to Cisco equivalents, however, they have justified their price point.
Network Administrator at a educational organization with 501-1,000 employees
I am satisfied with the pricing, licensing, and setup costs of FortiOS, rating it nine out of ten compared to other familiar leading firewalls.
Senior Manager at ITX360 (Pvt) Ltd
Zscaler Cloud Firewall is quite expensive compared to competitors.
Cyber Security Architect at Accenture
 

Valuable Features

Fortinet FortiOS is praised for UTM, user-friendly interface, robust security, excellent performance, cost-effectiveness, and seamless management.
Zscaler Cloud Firewall offers comprehensive security with real-time inspection, customizable controls, and automatic features, eliminating hardware needs.
It is user-friendly when it comes to turning on features, and it has been reliable and effective.
Network Administrator at a educational organization with 501-1,000 employees
The threat intelligence in FortiOS is very high, and the system is scalable without additional licensing costs.
Senior Manager at ITX360 (Pvt) Ltd
The solution offers good threat intelligence, which is crucial for our customers' security purposes.
Technology Consultant at 1ware
It is really customized, a security policy that can be applied to the users so they can access only the resources I enable them.
IT Security at a manufacturing company with 11-50 employees
Advanced threat protection features in Zscaler Cloud Firewall are practically the key component that every customer wants.
Director at Aquila ICT Solutions
The best features that Zscaler Cloud Firewall offers are that it is AI powered and automated.
Senior Devsecops Cloud Cybersecurity Specialist at CGI
 

Categories and Ranking

Fortinet FortiOS
Ranking in Firewalls
18th
Average Rating
8.4
Reviews Sentiment
8.0
Number of Reviews
82
Ranking in other categories
No ranking in other categories
Zscaler Cloud Firewall
Ranking in Firewalls
38th
Average Rating
8.2
Reviews Sentiment
6.3
Number of Reviews
20
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of July 2026, in the Firewalls category, the mindshare of Fortinet FortiOS is 1.1%, up from 1.1% compared to the previous year. The mindshare of Zscaler Cloud Firewall is 1.0%, up from 0.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Firewalls Mindshare Distribution
ProductMindshare (%)
Fortinet FortiOS1.1%
Zscaler Cloud Firewall1.0%
Other97.9%
Firewalls
 

Featured Reviews

MS
Associate Director IT Operations at Procento
Single-pane management has simplified firewall control and has improved risk mitigation
I would not say that Fortinet FortiOS is not very scalable. Generally, what happens is that for enterprises, we hire consultants who do the capacity planning and sizing to determine what kind of firewalls to put in place. At the same time, it is not only the number of users; it also depends on the number of WAN links coming in and everything, because we have been using Fortinet for bandwidth shaping and many other bandwidth-related functions. They should improve their machine learning AI capabilities of Fortinet FortiOS because there is too much competition. Other players are also improving and making a lot of changes in their UI and overall operating system.
Carlos Snel - PeerSpot reviewer
Director at Aquila ICT Solutions
Has streamlined secure deployments across large enterprises while offering reliable protection and intuitive management
The centralized management console, also referred to as the Zscaler dashboard, impacts the ability of my customers to respond to security incidents significantly. I see it as user-friendly, and clients are really happy with using it, which motivates them to keep using Zscaler Cloud Firewall because they enjoy the GUI. It's very intuitive, making it easy to navigate alerts and incidents. My clients rarely have questions about where to find specific information once Zscaler Cloud Firewall is running. The interface speaks for itself, requiring little to no additional training, which is a major plus. Advanced threat protection features in Zscaler Cloud Firewall are practically the key component that every customer wants. Unfortunately, it is an option and not included in the basic package. Clients need to pay for the next higher bundle to access it, but practically all clients I have dealt with want this feature 100%. Regarding visibility, I can confirm that Zscaler Cloud Firewall indeed includes a feature for application layer visibility embedded in the service. It provides visibility into what you're doing, which is especially interesting nowadays when discussing AI tools, as companies do not want their employees to copy-paste sensitive information into AI systems. We have seen cases such as Samsung's chip design where sensitive info got exposed. The visibility of applications, including cloud applications and AI tools, is significant for compliance with data policies, and you can also run reports and alerts on it.
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Top Industries

By visitors reading reviews
Construction Company
11%
Manufacturing Company
8%
Comms Service Provider
8%
Financial Services Firm
8%
Construction Company
11%
Manufacturing Company
11%
Financial Services Firm
8%
Marketing Services Firm
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business43
Midsize Enterprise13
Large Enterprise23
By reviewers
Company SizeCount
Small Business5
Midsize Enterprise2
Large Enterprise13
 

Questions from the Community

Features comparison between Palo Alto and Fortinet firewalls
In the best tradition of these questions, Feature-wise both are quite similar, but each has things it's better at, it kind of depends what you value most. PA is good at app control, web filtering a...
What is your experience regarding pricing and costs for Fortinet FortiOS?
I rate the pricing for FortiOS as eight or nine out of ten. It is an affordable solution for us.
What needs improvement with Fortinet FortiOS?
I would not say that Fortinet FortiOS is not very scalable. Generally, what happens is that for enterprises, we hire consultants who do the capacity planning and sizing to determine what kind of fi...
Which lesser known firewall product has the best chance at unseating the market leaders?
Netscope, Zscaler if they continue route they are on now. FIrewalls needs great deal of automation on each end, datacenter and endpoint. In between you have branch office. So blending EPP and firew...
What is your experience regarding pricing and costs for Zscaler Cloud Firewall?
My experience with pricing, setup cost, and licensing was fine.
What needs improvement with Zscaler Cloud Firewall?
I think Zscaler Cloud Firewall can be improved by adding more features. The needed improvements involve scalability, which is something I wish they would address.
 

Overview

 

Sample Customers

Black Gold Regional Schools, Amadeus Hospitality, Jefferson County, Chunghwa Telecom, City of Boroondara, Dimension Data
Zenith Live, Azure, Carlsberg Group
Find out what your peers are saying about Fortinet FortiOS vs. Zscaler Cloud Firewall and other solutions. Updated: June 2026.
902,988 professionals have used our research since 2012.