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OPNsense vs Zyxel Unified Security Gateway comparison

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Comparison Buyer's Guide

Executive Summary

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

Fortinet FortiGate
Sponsored
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
591
Ranking in other categories
Secure Web Gateways (SWG) (2nd), Firewalls (1st), Intrusion Detection and Prevention Software (IDPS) (1st), Software Defined WAN (SD-WAN) Solutions (1st), WAN Edge (1st), ZTNA (1st), Unified Threat Management (UTM) (1st)
OPNsense
Average Rating
8.2
Reviews Sentiment
6.6
Number of Reviews
47
Ranking in other categories
Firewalls (4th)
Zyxel Unified Security Gateway
Average Rating
6.6
Reviews Sentiment
4.9
Number of Reviews
4
Ranking in other categories
Unified Threat Management (UTM) (12th)
 

Featured Reviews

Abhinandan Yadav - PeerSpot reviewer
Network Security Engineer at a consultancy with 51-200 employees
Unified security and sd-wan have improved uptime and cut wan costs for multi-site branches
Users report stability issues in certain versions, which requires regular updates. Real-world attacks have also highlighted the need for urgent patching of vulnerabilities.Fortinet FortiGate, while a powerful and feature-rich web firewall, could improve in areas like firmware stability, documentation, and ease of use. The learning curve can be steep for some users. For beginners, support quality can vary, and frequent updates with occasional vulnerabilities call for careful patch management. However, once Fortinet FortiGate is configured, it remains highly reliable and efficient. Customer support needs improvement, as I find it very slow, with reports from other users reflecting that customer support is inadequate.
Moutaz Sheikh Alard - PeerSpot reviewer
ISO 27001 Lead Implementer at a consultancy with 11-50 employees
Has helped simulate enterprise security setups and strengthens network segmentation practices
For my capstone, I use OPNsense for my project and its broader benefits for enterprise and cybersecurity context. OPNsense is an open source based firewall and routing platform. It offers enterprise-grade features such as intrusion detection and prevention system, VPN support, traffic shaping, and web filtering, all without license cost. This platform has a modular design, a clean web-based GUI, and frequent updates that prioritize security and usability. It competes with commercial firewalls such as Cisco ASA, FortiGate, and Palo Alto, but stands out because it's community-driven, cost-effective, and transparent. I find OPNsense's feature of acting as a central firewall and gateway most valuable, providing robust point segmentation between the internal network and DMZs in my capstone project, intrusion detection to monitor malicious traffic, VPN services for secure remote access, and logging and monitoring for compliance and auditing. This allows me to simulate a real-world enterprise environment on a smaller scale, demonstrating both security hardening and network efficiency. OPNsense impacts my projects and home network positively because its cost-effectiveness is perfect for lab and enterprise setup without expensive licensing. The flexibility, easy VLAN and DMZ configuration supports different zones such as web servers, mail servers, and log servers. The security-first design for IDS/IPS integration helps me showcase modern defense-in-depth strategies. The user-friendly management through the web GUI makes it possible to manage complex firewall rules clearly, which is critical when documenting and presenting a capstone. Scalability is also an advantage. Although my project is lab-based, OPNsense can scale into production deployments in SMBs and enterprise.
reviewer2399337 - PeerSpot reviewer
Sales and technical consultant at a manufacturing company with 10,001+ employees
User has benefited from stable performance and effective completion of security tasks
I use it mostly for VPN and for some firewall solutions When considering my main use case with VPN, I can say that I got the Zyxel Unified Security Gateway, and it works fine. However, we are thinking about using a different solution based on open source because Zyxel Unified Security Gateway…

Quotes from Members

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

Pros

"Web filtering and two-factor authentication are great features."
"The most valuable feature of Fortinet FortiGate is URL filtering."
"SD-WAN has had a positive impact by reducing the operational costs in terms of headcount and management."
"The service provided by Fortinet FortiGate SWG is very good."
"The ease of use, concise reports, and threat identification are very user-friendly and valuable."
"Fortigate can mitigate all attacks, it can handle a lot, it has a good set of UTM features, a good bandwidth shaping mechanism, and other features."
"In my opinion, the main benefits that end users receive from Fortinet FortiGate are that the return on investment is good, whatever money we invest in Fortinet FortiGate product, we get it back in two years' time, it is pretty secure, having very robust hardware and software, updates are pretty good, and in the event of an issue, updates are pretty quick."
"Fortinet FortiGate is easy to use."
"For the initial setup of OPNsense, I find that it is very simple."
"It's open source."
"The technical support is very good."
"It has an open license, it works very well, and there is an update every month."
"OPNsense is easy to scale when running on the hardware."
"One of the most valuable features is the network checking. Additionally, the firewall and web filtering functionalities are highly useful."
"The most valuable features in OPNsense are reporting and visibility."
"I moved to OPNsense because it's more secure and more reliable."
"The most valuable features of the solution stem from web filtering, malware protection, and antivirus."
"This is a capable appliance and the standard features work well for us."
"The cost is very low."
"The Zyxel Unified Security Gateway solution is stable and does its job effectively."
"The solution can scale well."
"This is a capable appliance and the standard features work well for us."
 

Cons

"One of the features that I would like to have is endpoint protection, this should be integrated."
"The graphical interface could be improved."
"I wish Fortinet FortiGate's UI updates would be done in a more simplified way to improve it."
"The support costs and licensing are sometimes so expensive."
"It does not have key authentication for admin access."
"FortGate's IPS reporting could be made better by giving more details regarding the source and destination of network traffic when it comes to the overview section. This would allow me to more easily follow the flow of traffic based on IP addresses, without having to integrate the IPS with other products that perform more sophisticated traffic analysis."
"Technical support is a little slow and needs to be improved."
"Fortinet renewal prices for all models are too high, so they should offer discounts for customers on renewal."
"The solution can't compete with next-generation firewalls."
"FortiGate is a better firewall but that is commercial software that you have to buy a license for."
"I think the most important thing is that it should be easily accessible, but currently, that doesn't seem to be the case. We need a hardware platform that's based on common standards and open computing principles, which would be like a commodity and benefit us greatly."
"OPNsense struggles to handle large volumes of voice traffic, indicating scalability issues in that specific use case."
"They should improve IPEs for security in the future."
"There is room for improvement in SSL inspection."
"I would like better documentation concerning the provided packages and their integration."
"On the customer-side, because I'm a small business, I need a cheaper or free solution option."
"Although manageable, the user interface is a little bit slow and could be improved."
"Although manageable, the user interface is a little bit slow and could be improved. The advanced UI allows me to do whatever I want, but this is where the issue of speed exists."
"The product has some scalability and data management issues where improvements are required."
"I have never seen it in any company that I've worked with before, and I would advise other companies not to buy it."
"Sometimes it reboots when you least expect it, and that's the main issue."
 

Pricing and Cost Advice

"It's not the cheapest, but it's value for money. Given everything we've got out of it: the DMZ port, the VPN, and the high availability, it's a pretty reasonable price."
"The price is highly competitive when compared to other brands that offer similar functionality."
"We pay about $4,000 for a yearly license, and there aren't any additional fees."
"I think the price of Fortinet FortiGate is very reasonable."
"I'll rate FortiGate's pricing a five out of ten since it is moderately priced."
"The license for Fortinet FortiGate is affordable in my country."
"It has been two years. I don't remember the actual price, but it was affordable. We buy the boxes and then use the license for three years."
"I had to pay for the license for the firewall, but it is guaranteed to have updates. I expect a good service for it. It was about €1000 for a year, and there was no additional cost."
"It's a free solution."
"OPNsense is a well known open-source tool."
"The price of OPNsense is good."
"It is a free solution, and when you compare it to alternatives like FortiGate, which is quite powerful but also costly, the value becomes evident."
"I'm using the free version of OPNsense. I didn't check the pricing for the solution because I still need to test it before getting the approval to purchase OPNsense, and it isn't easy to get approval from the higher-ups."
"We are not paying any licensing fees. OPNsense is completely free for us."
"OPNsense is open source software so at this time it is free for us to use."
"I've used the free version. My computer with two network cards at home allows me to try as many different software options as I want. I did pay for the license, but it was for the Zenarmor license, which is the packet inspection tool. They use AI for packet inspection, which integrates with OPNsense and pfSense."
"The price of Zyxel Unified Security Gateway is good compared to other similar products in the market."
"This gateway is pretty cheap."
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Top Industries

By visitors reading reviews
Computer Software Company
10%
Comms Service Provider
10%
Manufacturing Company
9%
Financial Services Firm
7%
Comms Service Provider
17%
Computer Software Company
10%
Manufacturing Company
7%
Financial Services Firm
6%
Comms Service Provider
20%
Outsourcing Company
8%
Financial Services Firm
7%
Computer Software Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business367
Midsize Enterprise135
Large Enterprise193
By reviewers
Company SizeCount
Small Business32
Midsize Enterprise6
Large Enterprise8
No data available
 

Questions from the Community

Which is the better NGFW: Fortinet Fortigate or Cisco Firepower?
When you compare these firewalls you can identify them with different features, advantages, practices and usage a...
What is the biggest difference between Sophos XG and FortiGate?
From my experience regarding both the Sophos and FortiGate firewalls, I personally would rather use FortiGate. I know...
What are the biggest technical differences between Sophos UTM and Fortinet FortiGate?
As a solution, Sophos UTM offers a lot of functionality, it scales well, and the stability and performance are quite ...
What is the difference between PfSense and OPNsense?
Two of the most common and well recognized firewalls, PfSense and OPNsense both support site-to-site IPsec VPN and cl...
What is your experience regarding pricing and costs for OPNsense?
Setup cost is almost zero as one can simulate the whole environment using open source version. Pricing seems fair eno...
What needs improvement with OPNsense?
In my opinion, OPNsense could improve by incorporating either an open side of wireless management or a way that you c...
What is your experience regarding pricing and costs for Zyxel Unified Security Gateway?
I cannot definitively comment on whether Zyxel Unified Security Gateway is an affordable product as I haven't done co...
What needs improvement with Zyxel Unified Security Gateway?
The integration capability is quite challenging. The system is very complicated, and many features are hidden. I'm lo...
What is your primary use case for Zyxel Unified Security Gateway?
I use it mostly for VPN and for some firewall solutions. When considering my main use case with VPN, I can say that I...
 

Also Known As

Fortinet FortiGate Next-Generation Firewall
No data available
No data available
 

Overview

 

Sample Customers

Amazon Web Services, Microsoft, IBM, Cisco, Dell, HP, Oracle, Verizon, AT&T, T-Mobile, Sprint, Vodafone, Orange, BT Group, Telstra, Deutsche Telekom, Comcast, Time Warner Cable, CenturyLink, NTT Communications, Tata Communications, SoftBank, China Mobile, Singtel, Telus, Rogers Communications, Bell Canada, Telkom Indonesia, Telkom South Africa, Telmex, Telia Company, Telkom Kenya
1. Deciso B.V. 2. iXsystems, Inc.  3. EuroBSDCon  4. Netgate  5. Claranet  6. Voleatech  7. Open Systems AG  8. Securebit AG  9. Proxmox Server Solutions GmbH  10. AVM Computersysteme Vertriebs GmbH  Additional customers include: T-Systems International GmbH, Deutsche Telekom AG, Vodafone GmbH, 1&1 IONOS SE, OVHcloud, Hetzner Online GmbH, Strato AG, PlusServer GmbH, Host Europe GmbH, United Internet AG, 1&1 Versatel Deutschland GmbH, QSC AG, Bechtle AG, Cancom SE, Computacenter AG & Co. oHG, T-Systems Multimedia Solutions GmbH, Atos SE, Capgemini SE, Accenture plc, IBM Corporation, Hewlett Packard Enterprise Company, Cisco Systems, Inc.
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Find out what your peers are saying about OPNsense vs. Zyxel Unified Security Gateway and other solutions. Updated: April 2026.
896,467 professionals have used our research since 2012.