OPNsense Reviews

Name: OPNsense
Brand: OPNsense
Rating: 4.2 (43 reviews)

4.2 out of 5

43 reviews
97% willing to recommend

What is OPNsense?

OPNsense is widely used for firewall functionalities, intrusion detection, VPN and IPSec, content filtering, securing network traffic, and remote access. It protects internal networks and manages servers securely, suitable for small to medium-sized businesses.

Get the OPNsense Buyer's Guide and find out what your peers are saying about OPNsense, Fortinet FortiGate, Netgate pfSense and more!

OPNsense is the #3 ranked solution in best firewalls. PeerSpot users give OPNsense an average rating of 8.4 out of 10. OPNsense is most commonly compared to Fortinet FortiGate: OPNsense vs Fortinet FortiGate. OPNsense is popular among the large enterprise segment, accounting for 41% of users researching this solution on PeerSpot. The top industry researching this solution are professionals from a comms service provider, accounting for 16% of all views.

Helped 867,341 peers since 2012

Featured OPNsense reviews

Richard Chamberlain

Administrator at a retailer with 10,001+ employees

The best features OPNsense offers include the VLANs that work spotlessly, and I feel very secure in my network because of it. It was relatively easy to set up, though I think a better wizard would help out. One of the things I appreciated about the VLANs is that I can have a Wi-Fi VLAN and feel secure that the server network or the VM network that I have on a different VLAN are isolated, and they cannot talk to one another, which adds a great level of security. OPNsense has positively impacted my organization and home lab through its security features, though it's hard to quantify as I don't pay enough attention to the logs to see what it's stopping from an outside perspective. It's actually sitting behind my modem from my ISP and I'm not in bridge mode. OPNsense definitely gives me peace of mind and helps my workflow because of the network isolation. I can have multiple subnets without having to worry about one affecting the other.

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Mahmoud Suleiman

Senior IT Infrastructure Engineer at a real estate/law firm with 11-50 employees

In my opinion, the best features OPNsense offers are that it's open source, so it can be implemented in whatever scope or environment that I need. I just need to scale the hardware for that environment and I don't have to pay a license, perpetual or renewal. The open-source aspect and flexibility of OPNsense have helped me significantly, especially due to the difference in the currency exchange rate here in Egypt, where the licensing and budgeting for IT infrastructure is very hard right now due to the high cost of the products in the Egyptian currency. Most companies see that the IT department is a consuming department, not one that's bringing money, with the ROI being an improvement in SLAs in a few percentages. We have a tight budget in Egyptian pounds, so when we get stuck because the budget has ended, we have to prefer open-source solutions to save budget, and here the open source can rise and shine. I don't need the license, so I will save cost in my budget that I can use in another product that doesn't have any alternative. People sometimes overlook that OPNsense is modular, and that you can install plugins to improve it. You don't have to use it bare-metal OPNsense releases; it's modular, and you can add whatever plugin or features that you need to be added.

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Moutaz Sheikh Alard

ISO 27001 Lead Implementer at a consultancy with 11-50 employees

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.

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OPNsense mindshare

As of September 2025, the mindshare of OPNsense in the Firewalls category stands at 11.1%, down from 15.9% compared to the previous year, according to calculations based on PeerSpot user engagement data.

Firewalls Market Share Distribution
Product	Market Share (%)
OPNsense	11.1%
Fortinet FortiGate	20.1%
Netgate pfSense	11.1%
Other	57.699999999999996%

Firewalls

PeerResearch reports based on OPNsense reviews

Type	Title	Date
Category	Firewalls	Sep 13, 2025	Download
Product	Reviews, tips, and advice from real users	Sep 13, 2025	Download
Comparison	OPNsense vs Fortinet FortiGate	Sep 13, 2025	Download
Comparison	OPNsense vs Netgate pfSense	Sep 13, 2025	Download
Comparison	OPNsense vs Sophos XG	Sep 13, 2025	Download

Title	Rating	Mindshare	Recommending
Fortinet FortiGate	4.2	20.1%	91%	411 interviews Add to research
Netgate pfSense	4.3	11.1%	93%	217 interviews Add to research

Valuable Features

Valuable aspects of OPNsense include flexibility, ease of use, and user-friendly interface. Users appreciate its reporting, visibility, and VPN capabilities. The firewall and network security features are robust, providing comprehensive threat mitigation. Frequent updates, open-source nature, and ease of configuration enhance user experience. The dashboard, web filtering, content filtering, and IP blocking contribute to its effectiveness. Users find OPNsense scalable, stable, and efficient for both small businesses and individual usage, aligning well with diverse needs.

"OPNsense impacts my projects and home network positively because its cost-effectiveness is perfect for lab and enterprise setup without expensive licensing, and the flexibility, easy VLAN and DMZ configuration supports different zones such as web servers, mail servers, and log servers."
"We saved up to half a million Egyptian pounds, which is nearly $100,000 yearly on licensing or subscription using this kind of software, and the network attacks reduced by approximately 60% after using that, even without customizing the custom configuration yet."
"OPNsense definitely gives me peace of mind and helps my workflow because of the network isolation, as I can have multiple subnets without having to worry about one affecting the other."

Room for Improvement

OPNsense requires improvements in integration with virtual servers, customer-side scalability, and translation. The user interface and monitoring tools need enhancement to simplify configuration. VPN reliability and alerting require upgrades. Increased documentation and training resources are needed. SSL inspection and firewall functionality should be refined. Performance and compatibility with more virtualization platforms, additional reporting features, and a mature API for better threat hunting are necessary. Enhanced SD-WAN, interface, and voice traffic handling are desired by users.

"The documentation should be clearer because I faced some difficulties navigating many options."
"OPNsense can be improved by making it more user-friendly, as its current UI is not that user-friendly when compared to paid software such as Sophos."
"OPNsense could be improved with a better wizard, as when I first installed it, it seemed difficult to know where to go."

ROI

Users experienced substantial returns with OPNsense, with some achieving it in less than three months. Annual costs of around $5,000 were saved due to lack of recurring fees, covering equipment expenses quickly. Threat detection and containment improved from 50 to 15 minutes, demonstrating significant operational impacts over competitors like Check Point and FortiNet. Some users enhanced their network security with minimal investment though not all observed quantifiable gains.

Pricing

OPNsense is primarily free as it is open-source, with no licensing fees, making it highly cost-effective for enterprises. The primary expense involves hardware acquisition. For those opting for additional support or advanced features, costs can range from $900 to $1000 annually. Users note its affordability compared to alternatives like FortiGate or Palo, highlighting its value in scenarios with varying infrastructure needs, whether on-premises or in the cloud, where hardware or infrastructure determines overall costs.

"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 is free."
"I would rate the pricing a nine out of ten, especially considering the availability of a free community edition."

Popular Use Cases

Users primarily employ OPNsense for VPN connections and firewall operations, safeguarding data centers and networks from malicious traffic. It supports SAP systems with site-to-site connections, secures servers, and enables remote access in corporate and home environments. OPNsense handles intrusion detection, proxy functionalities, network management, and is favored for its versatility in cloud and on-premises deployments. Many leverage it for content filtering and advanced security measures in various business sectors.

Service and Support

Many users manage issues independently using online resources, such as forums and community pages, with occasional mentions of responsive technical support. Several users note a lack of direct accessibility to official support, emphasizing community-driven assistance. While some express satisfaction with available support, others mention the need for more structured resources. Many rely heavily on the internet for troubleshooting and find community forums highly beneficial, preferring them due to their comprehensive information.

Deployment

Users found OPNsense's initial setup straightforward and quick, often taking under a few hours or days depending on configurations and needs. Most reported it as easy, even without extensive technical skills, although some experienced challenges with specific features like VPN configurations. Overall, those familiar with networking tools like firewalls found it manageable. While certain aspects required more time, many highlighted its ease for those with basic firewall knowledge.

Scalability

Users report that OPNsense is highly adaptable. Many appreciate its ability to handle diverse workloads with varying user numbers. It is noted for being flexible with hardware upgrades or VM resource allocation. While many find it excellent for their needs, some express limited capability for massive installations. Its ability to support network functions like VPN, traffic monitoring, and security with additional packages is highlighted. Performance varies with specific use cases, such as handling large voice traffic volumes.

Stability

OPNsense demonstrates consistent stability with minimal issues. Some report challenges with VPN connections and occasional updates, yet many find it generally reliable. Users highlight successful performance in multiple environments such as Hyper-V and older servers. Ratings often vary from seven to ten, with strong marks for handling standard tasks. Some note difficulties with complex setups or high traffic, but overall, OPNsense is appreciated for its robust framework and adaptability.

These insights are based on the in-depth reviews provided by peers to help you make a better buying decision.

Download our OPNsense Buyer's Guide for additional reliable information.

Review data by company size

By reviewers
Company Size	Count
Small Business	26
Midsize Enterprise	3
Large Enterprise	7

By reviewers

By visitors reading reviews
Company Size	Count
Small Business	1330
Midsize Enterprise	687
Large Enterprise	1381

By visitors reading reviews

Top industries

By visitors reading reviews

Computer Software Company

16%

Comms Service Provider

16%

University

Manufacturing Company

Educational Organization

Government

Financial Services Firm

Media Company

Retailer

Hospitality Company

Non Profit

Healthcare Company

Outsourcing Company

Energy/Utilities Company

Construction Company

Insurance Company

Real Estate/Law Firm

Transportation Company

Legal Firm

Performing Arts

Wholesaler/Distributor

Recreational Facilities/Services Company

Aerospace/Defense Firm

Compare OPNsense with alternative products

Learn more about OPNsense

OPNsense is a comprehensive firewall solution leveraging open-source technology. It integrates with third-party modules like WireGuard and CrowdSec, enhancing its security capabilities. Offering on-premises and cloud deployment, it features an intuitive graphical interface, advanced reporting, VPN functionality, IDS/IPS features, and high scalability. Users find it ideal for small businesses and home networks due to its stability and ease of use. Frequent updates and an active community support its continuous improvement. However, it needs advancements in VPN selection, scalability, and technical documentation. Enhanced high availability, threat intelligence, and integration with virtualization platforms are required. User feedback suggests improvements in connectivity, alerting, traffic monitoring, and antivirus protection.

What are the key features of OPNsense?

Strong Firewall: Robust firewall capabilities for securing network traffic.
Intrusion Detection and Prevention: Effective IDS/IPS for threat mitigation.
VPN Functionality: Comprehensive VPN support including WireGuard.
Content Filtering: DNS-level filtering for enhanced security.
Advanced Reporting: In-depth traffic analysis and reporting features.
High Scalability: Supports growing network demands.
Integration Capabilities: Works with third-party modules like CrowdSec.
Intuitive GUI: User-friendly graphical interface enhances usability.

What benefits should users look for in OPNsense reviews?

Security: High level of protection for internal networks.
Manageability: Easy management of servers and network traffic.
Cost-Effective: Open-source nature reduces costs.
Reliability: Stable performance suitable for small and medium-sized businesses.
Community Support: Active community and frequent updates.

OPNsense is implemented across various industries to secure network infrastructure and ensure reliable connectivity. In fintech, it safeguards sensitive financial data while maintaining compliance. Educational institutions deploy it to protect student information and enable secure remote learning environments. Healthcare organizations use it to secure patient data and comply with HIPAA regulations. By integrating with tools like WireGuard and CrowdSec, businesses enhance their cybersecurity posture and streamline network management, making OPNsense a versatile choice for diverse operational needs.

OPNsense customers

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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OPNsense Reviews Summary
Author info	Rating	Review Summary
Administrator at a retailer with 10,001+ employees	4.0	I've used OPNsense as my home firewall for two years, primarily valuing its VLAN support for network isolation. It's stable, scalable, and free, though initial setup was tricky and better official setup guidance would help.
Senior Client Solutions Architect at a tech services company with 1,001-5,000 employees	4.5	I am a Sales Engineer using OPNsense for demos on the road due to its ease of use, stability, and features like Zenarmor and Tailscale. Although Grafana integrations could improve, it offers significant operational benefits over Check Point and FortiNet.
Senior IT Infrastructure Engineer at a real estate/law firm with 11-50 employees	4.0	I use OPNsense on-premises mainly as a firewall. It's stable, scalable, open source, and cost-effective, helping cut expenses while improving security, though its UI needs improvement compared to alternatives like Sophos.
ISO 27001 Lead Implementer at a consultancy with 11-50 employees	4.5	I used OPNsense for my capstone project and home network due to its rich features, reliability, and cost-effectiveness; while it performs well, clearer documentation would improve usability, especially for new users like students.
Senior Network Engineer at a comms service provider with 11-50 employees	4.0	I primarily use OPNsense for network security, appreciating its reliable firewall and GeoIP features. It's stable and easy to upgrade. However, improvements are needed for handling large voice and data traffic. Compared to FortiGate, I find OPNsense more user-friendly.
Owner at Networks srl	4.0	I rely on OPNsense for its strong network intrusion detection and prevention capabilities, though its APIs need more development for better threat automation. It improved our threat response time significantly compared to our previous use of Cisco ASA 5505.
System and Network Administrator at El Sadat City Language School	3.5	I use OPNsense primarily for managing security and network traffic. Its DNS filtering and VPN functionality are valuable, but the interface and bundle management need improvement. Supporting additional virtualization platforms would enhance its usability for larger companies.
IT Manager at Pride in Azure	4.0	I find OPNsense's Dual WAN feature highly valuable for its advanced capabilities and cost-effective communication. I appreciate its security aspects but would like better documentation and community support for the free edition, especially for home users.

OPNsense Reviews

What is OPNsense?

Featured OPNsense reviews

OPNsense mindshare

PeerResearch reports based on OPNsense reviews

Valuable Features

Room for Improvement

ROI

Pricing

Popular Use Cases

Service and Support

Deployment

Scalability

Stability

Review data by company size

Top industries

Compare OPNsense with alternative products

Learn more about OPNsense

OPNsense customers

Related questions

Product Categories

Popular Comparisons