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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
592
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
6.7
Number of Reviews
46
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) (13th)
 

Featured Reviews

Abhinandan Yadav - PeerSpot reviewer
Network Security Engineer at Arrow PC Network Pvt Ltd
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

"The web controls are what I appreciate about Fortinet FortiGate. We have extensive controls over areas where we could block external-facing IPs, external URLs. We can do geo-fencing with the firewalls, which is a good feature."
"Fortinet FortiGate has many valuable features, such as IDS, and intrusion detection. It has security features that are in part with the technologies that are available in the market."
"Once installed it will do its job efficiently and effectively for several years."
"Fortinet FortiGate is a stable solution."
"This is a quality product with ok support, and it is better than the competition we've tried."
"The most important feature, normally for small business customers, is link load balancing."
"The web filtering facility and application control are the most valuable features from the point of view of our clients. The VPN feature is also quite popular amongst our clients. Two-factor authentication is one of the good features in Fortinet. These features are important for the current scenario of security. Security has become a necessity nowadays. With cyber-attacks becoming more common, protecting an organization's data is one of the major tasks. It is also very stable and scalable, and it is very straightforward to configure. Their technical support is also good."
"The Fortinet technical support is awesome."
"The IDS and IPS features are valuable. From the usability perspective, there is a lot of good documentation. As IT professionals, we found it very easy to configure the firewall. It was easy to configure and use."
"OPNsense is highly stable."
"The tool's integration is more like a button press."
"The graphic user interface is very good and it is user-friendly which makes the product easy-to-use."
"I have found the solution has some great features overall, such as guest access capabilities, dashboards, and ease of use, with plenty of documentation and support and the plugins that I needed."
"The most valuable features in OPNsense are reporting and visibility."
"With the VPN solutions, it is possible to cover up all the scenarios which we have."
"I feel that its valuable features are that it is simple and free."
"The solution can scale well."
"The cost is very low."
"This is a capable appliance and the standard features work well for us."
"This is a capable appliance and the standard features work well for us."
"The most valuable features of the solution stem from web filtering, malware protection, and antivirus."
"The Zyxel Unified Security Gateway solution is stable and does its job effectively."
 

Cons

"We haven't tapped into most of the functionalities that Fortinet FortiGate offers because we're using it just for gateway security. One of the things that I would prefer is a more expansive use of their analyzer. They could do more work on FortiAnalyzer in terms of the data and the information coming from it."
"The captive portal could be improved."
"Regarding stability, I have experienced performance issues with Fortinet FortiGate. Sometimes it does not work correctly in certain situations, such as DNS or URL categories, where it might block incorrectly."
"The reports are very basic."
"Fortinet should improve its software, as we are seeing lots of firmware versions generated for each vulnerability issue. It becomes difficult for us to keep updating the firmware frequently due to bugs."
"I would like to see improvements in Fortinet FortiGate regarding the active-active scenario. The active-active scenario is supported but not recommended, whereas other vendors are implementing active-active without issues. Perhaps in the future, we could effectively use both firewalls to increase the throughput. If there are two boxes, they both should be able to work."
"Fortinet FortiGate SWG can't be used on its own, and you have to get FortiAnalyzer."
"I don't really have anything negative to say as far as Fortinet firewalls are concerned. If anything, they can support a user a little bit better. They can stop being so time-sensitive about how much time the support call has taken, and they can help you do it yourself."
"The logging could improve in OPNsense."
"The IPS solution could be more reliable."
"The interface needs to be simplified. It is not user-friendly."
"The scalability needs improvement."
"The support for OPNsense is good because we have documents available on the internet. The support could improve a little."
"There are some add-ons that need enhancements to make management easier for users, especially the reporting features. Some reports don't show the level of detail I'm looking for, and I've had trouble installing certain add-ons, especially for Internet bandwidth shaping within my company."
"FortiGate is a better firewall but that is commercial software that you have to buy a license for."
"They should improve IPEs for security in the future."
"I have never seen it in any company that I've worked with before, and I would advise other companies not to buy it."
"The product has some scalability and data management issues where improvements are required."
"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."
"Sometimes it reboots when you least expect it, and that's the main issue."
 

Pricing and Cost Advice

"I rate FortiGate Next Generation Firewall a five out of ten for pricing."
"The main reason we chose Fortinet FortiGate was that the price was better than the competition."
"I think price-wise, the solution is totally reasonable since it has many products to serve, starting from small homes to massive scale sites."
"The solution is more expensive than Sophos. It could be cheaper. The licensing is on a yearly basis. We have had it for about three years. We must only pay extra for the license, additional requirements, and the hardware box."
"The price is high compared to some of the other solutions."
"The cost has increased since the update so I would rate it eight out of ten."
"​We saved a bundle by not needing all the past appliances from an NGFW.​"
"The licensing costs are very competitive."
"It costs about $1000."
"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."
"It's not expensive."
"We are not paying any licensing fees. OPNsense is completely free for us."
"OPNsense is a well known open-source tool."
"Its pricing is unbeatable in comparison to other firewalls. You can have a small instance that could be €80 a month with the hardware underneath. Azure Firewall and FortiGate are out of the question at this price. If you are on a public cloud, you need the underlying infrastructure. Other than that, there is no additional cost. If you have it on-prem, you have to buy the server or the appliance. The hardware cost is replaced with the infrastructure cost in the cloud. You also have costs for the public IPs and underlying VMs, but that's not related to OPNsense. It would be the same for a FortiGate deployment on Azure. You need a FortiGate license, and you need the underlying infrastructure that scales up depending on your needs."
"OPNsense is an open-source solution and it is free to use."
"It is not an expensive product. Basically, I deployed it because it was the fastest solution to satisfy our needs in open source."
"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
11%
Comms Service Provider
10%
Manufacturing Company
8%
Financial Services Firm
7%
Comms Service Provider
17%
Computer Software Company
11%
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 Business31
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 do you like most about OPNsense?
What I like the most about OPNsense is that it offers an easy-to-use dashboard for device management and control.
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 do you like most about Zyxel Unified Security Gateway?
The most valuable features of the solution stem from web filtering, malware protection, and antivirus.
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...
 

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.
890,088 professionals have used our research since 2012.