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Fortinet FortiOS Reviews

Vendor: Fortinet
4.2 out of 5
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What is Fortinet FortiOS?

Fortinet FortiOS is recognized for its intuitive interface, ease of use, and comprehensive security features, making it a valuable tool for network security and management. Its integration capabilities and affordability prove beneficial for small to mid-sized businesses.

Get the Fortinet FortiOS Buyer's Guide and find out what your peers are saying about Fortinet FortiOS, Fortinet FortiGate, Netgate pfSense and more!
Fortinet FortiOS is the #20 ranked solution in best firewalls. PeerSpot users give Fortinet FortiOS an average rating of 8.4 out of 10. Fortinet FortiOS is most commonly compared to Fortinet FortiGate: Fortinet FortiOS vs Fortinet FortiGate. Fortinet FortiOS is popular among the large enterprise segment, accounting for 38% of users researching this solution on PeerSpot. The top industry researching this solution are professionals from a manufacturing company, accounting for 9% of all views.
Buyer's Guide
Fortinet FortiOS
April 2026
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Fortinet FortiOS mindshare

As of May 2026, the mindshare of Fortinet FortiOS in the Firewalls category stands at 1.1%, up from 1.0% compared to the previous year, according to calculations based on PeerSpot user engagement data.
Firewalls Mindshare Distribution
ProductMindshare (%)
Fortinet FortiOS1.1%
Fortinet FortiGate16.0%
OPNsense8.9%
Other74.0%
Firewalls

PeerResearch reports based on Fortinet FortiOS reviews

TypeTitleDate
CategoryFirewallsMay 1, 2026Download
ProductReviews, tips, and advice from real usersMay 1, 2026Download
ComparisonFortinet FortiOS vs Fortinet FortiGateMay 1, 2026Download
ComparisonFortinet FortiOS vs Netgate pfSenseMay 1, 2026Download
ComparisonFortinet FortiOS vs Sophos FirewallMay 1, 2026Download
Suggested products
TitleRatingMindshareRecommending
Fortinet FortiGate4.216.0%92%592 interviewsAdd to research
Netgate pfSense4.38.3%94%221 interviewsAdd to research
 
 
Key learnings from peers

Valuable Features

Fortinet FortiOS offers user-friendly features like Unified Threat Management, robust VPN services, intrusion prevention, antivirus, and SD-WAN. Its graphical interface is intuitive, supporting seamless firmware upgrades and high availability. Users appreciate web filtering, application control, and traffic management. It integrates well with Cisco, provides threat intelligence, allows detailed policy creation, and is suitable for large-scale deployments. Its ease of use and comprehensive security features are highly valued, offering flexibility and cost-efficiency.
  • "The most valuable features of Fortinet FortiOS are the ease of use and user-friendly interface."
  • "This is a user friendly solution and offers comprehensive integrations."
  • "The most valuable feature of Fortinet FortiOS is network segregation, UTM, and antivirus, freight management protection such as DDoS, and additionally, the CLI and the GUI are easy to use."

Room for Improvement

Fortinet FortiOS needs improvements in simplifying VPN complexity and enhancing compatibility with older devices. Users desire a more intuitive GUI, better integration capabilities, and improved reporting functionalities. Technical support response speed and pricing structure are also points of concern. Frequent updates can be burdensome due to broadband limitations. Advanced features sometimes require command-line access, and memory management could be optimized. FortiOS could further benefit from enhanced cloud functionality and expanded real-time monitoring capabilities.
  • "Some features I have found to be hidden and cannot be accessed through the graphical user interface, you can only access them through the command-line interface (CLI). All the features should be accessible through the graphical user interface."
  • "The reporting for this solution could be improved. It could also be more stable and offer better pricing."
  • "There is some room for improvement in the support."

ROI

Users found Fortinet FortiOS a valuable investment, noting its scalability and ease of use which eliminates extensive training. Its effectiveness in handling security threats prevents costly system cleanups, boosting return on investment. Some observed a near break-even point for renewals. Many highlighted its competitive pricing and reliability. It's rated highly, especially in terms of security improvement. Comparatively, Fortinet FortiOS is cost-effective and collaborates well with other vendor systems.

Pricing

Fortinet FortiOS pricing is typically competitive for medium to large enterprises, with renewal on an annual or multi-year basis. Licensing costs can be influenced by partner agreements and chosen features. While initial purchase prices are relatively reasonable, subscription renewals can become expensive. Fortinet is generally considered affordable compared to competitors like Cisco and Palo Alto, but smaller businesses might find the costs challenging. Customization of licensing options allows flexibility based on traffic needs and desired features.
  • "Regarding the cost, the initial purchase is relatively cheap because it comes bundled. However, the subscription renewals can be quite expensive. The renewal costs are high, even though the initial purchase might include discounts."
  • "Pricing for the tool can vary. Sometimes, aggressive pricing is offered at the start, but later, as subscriptions and expansions are needed, the costs can increase, and customers may have to pay whatever is required."
  • "The solution is cost effective. I would rate the pricing a five out of ten."

Popular Use Cases

Fortinet FortiOS is primarily used for network security purposes, including edge security, firewalls, VPNs, and application control. It supports SD-WAN for data center protection and site-to-site connectivity. Users employ it for intrusion prevention, bandwidth management, and integration with cloud services like AWS and Azure. It facilitates secure channel integrations and web application filtering for financial and corporate networks, ensuring comprehensive protection for various deployments across SMBs and larger enterprises.

Service and Support

Fortinet FortiOS technical support is generally positive, with many noting responsive and helpful service. Challenges include occasional slow response times, knowledge gaps, and documentation inconsistencies for advanced tasks. Users appreciate local language support and fast ticket responses but desire improvements in support speed for complex issues. Some find competitor support more effective. Customer service is praised for being accessible and responsive, with users rating their satisfaction highly, though some suggest further enhancements.

Deployment

Fortinet FortiOS's initial setup is often described as straightforward, with many users completing it in a few hours to a few days. Some find it very easy, while others note a learning curve, especially with SD-WAN. Experienced users appreciate its simplicity. Deployment time varies based on complexity and requirements. Although some mention challenges, especially for novices, many agree that understanding security concepts or using available resources helps significantly.

Scalability

Fortinet FortiOS offers extensive scalability with ability to support numerous users across diverse environments. Users note its integration capabilities and flexibility in expanding networks. While generally praised for its adaptability, some mention hardware limitations requiring unit upgrades for further expansion. Many find its scalability features commendable, though hardware considerations are crucial for maximizing its potential. This scalability is frequently highlighted by users in various organizational settings, affirming its effectiveness in adaptability and growth.

Stability

Fortinet FortiOS is noted for its impressive stability by many users, proving reliable even after years of consistent use. Despite minor bugs due to updates or configurations, support is quick to address them. It outperforms many alternatives in terms of maintaining functionality during upgrades, with users reporting minimal issues. While there are occasional stability concerns, especially with specific versions, Fortinet FortiOS consistently offers a robust experience for most features and functions.
These insights are based on the in-depth reviews provided by peers to help you make a better buying decision.
Download our Fortinet FortiOS Buyer's Guide for additional reliable information.

Review data by company size

By reviewers
Company SizeCount
Small Business37
Midsize Enterprise12
Large Enterprise18
By reviewers
By visitors reading reviews
Company SizeCount
Small Business178
Midsize Enterprise113
Large Enterprise182
By visitors reading reviews

Top industries

By visitors reading reviews
Manufacturing Company
9%
Computer Software Company
9%
Financial Services Firm
8%
Comms Service Provider
8%
Construction Company
8%
Government
7%
Marketing Services Firm
6%
University
4%
Educational Organization
4%
Performing Arts
3%
Healthcare Company
3%
Transportation Company
3%
Retailer
3%
Outsourcing Company
3%
Media Company
3%
Energy/Utilities Company
2%
Legal Firm
2%
Real Estate/Law Firm
2%
Insurance Company
2%
Wholesaler/Distributor
2%
Non Profit
2%
Recreational Facilities/Services Company
1%
Wellness & Fitness Company
1%
Logistics Company
1%
Hospitality Company
1%
Pharma/Biotech Company
1%
Consumer Goods Company
1%
Renewables & Environment Company
1%

Compare Fortinet FortiOS with alternative products

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Learn more about Fortinet FortiOS

Fortinet FortiOS stands out as a firewall operating system, offering solutions in network security with a user-friendly design. It provides strong management tools like Unified Threat Management, web filtering, intrusion prevention, and antivirus functionalities. Its scalability and robust support make it ideal for diverse business environments. Users can benefit from high availability, seamless integration with other networks, and SD-WAN capabilities. Though there is room for improvement in monitoring and logging features, as well as VPN complexity and browser compatibility, its comprehensive range of features supports secure operations.

What are some key features of Fortinet FortiOS?
  • Unified Threat Management: Consolidates multiple security features into one platform for streamlined protection.
  • Web Filtering: Blocks access to harmful websites to enhance browsing safety.
  • Intrusion Prevention: Identifies and mitigates network threats in real time.
  • Antivirus Capabilities: Detects and neutralizes malicious software before it infiltrates systems.
  • Advanced Threat Detection: Uses analytics to uncover sophisticated threats.
What benefits should users expect from Fortinet FortiOS?
  • Scalability: Easily adapts to an organization's growing security needs.
  • Stability: Provides consistent and reliable performance for network infrastructures.
  • Robust Support: Access to extensive resources and customer support for issue resolution.
  • Integration: Harmonizes efficiently with existing networks and third-party solutions.
  • Pricing: Offers a competitive and reasonable cost structure.

Fortinet FortiOS is leveraged across multiple industries for its strong security capabilities. Companies utilize it for secure connections, VPN setups, and traffic management. It is essential for organizations seeking to protect data centers, ensure secure branch connectivity, and deploy SD-WAN. Its design supports implementation in cloud environments and enhances virtual infrastructure protection, making it particularly suitable for small to mid-tier businesses looking for comprehensive security measures.

Fortinet FortiOS customers

Black Gold Regional Schools, Amadeus Hospitality, Jefferson County, Chunghwa Telecom, City of Boroondara, Dimension Data

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Product Categories

Product Categories
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Fortinet FortiOS Reviews Summary
Author infoRatingReview Summary
Associate Director IT Operations at Procento4.0I've found Fortinet FortiOS reliable and simple to manage, especially for small to mid-sized businesses, with a strong UI and decent machine learning features, though it lags behind in scalability for enterprise environments.
Senior Network & Security Engineer at a logistics company with 51-200 employees4.0I've worked with Fortinet FortiOS for six years, managing FortiGate via FortiWeb. Its valuable features include multi-tenancy and threat prevention. Improvements could include AI functionality and centralization. Compared to PAN-OS, it offers significant time and cost savings.
Director, IT Infrastructure Department at Zemen Bank S.C.4.5I have been using Fortinet FortiOS for nearly seven years for both internal and external firewalls. It excels in ease of use and seamless firmware upgrades. However, some versions face memory issues, necessitating better support to resolve these problems.
Senior Manager at ITX360 (Pvt) Ltd4.5I've used FortiOS for over ten years as a system integrator, valuing its user-friendly configuration and scalable features like web filtering and IPS. However, initial releases often have bugs, despite reasonable pricing and strong threat intelligence.
Network Administrator at a educational organization with 501-1,000 employees4.5I use FortiOS on FortiGate firewalls to manage wireless networks, benefiting from its user-friendly and reliable features. However, better CLI documentation would be helpful. Its reliability ensures a strong return on investment, negating frequent hardware replacements.
Technology Consultant at 1ware4.5We use FortiOS for network security, benefiting from its IPS, web blocker, and application blocker features. However, real-time logging needs improvement. Despite Palo Alto's stability, Fortinet offers strong cost efficiency and compatibility, aligning with our system integrator partnership.
Manager IT Solutions Delivery at AL HIBA INFORMATION TECHNOLOGY SERVICES4.0I use Fortinet FortiOS mainly for site-to-site VPNs, reporting, and wireless capabilities. While it's well integrated within the Fortinet ecosystem, improvements could be made in third-party integration and consistent pricing across regions to avoid confusion.
Associate Director, IT at Khaitan & Co LLP3.5I use Fortinet FortiOS for load balancing and traffic filtering. Its significant features, like managing network sessions, are valuable, despite needing better reporting. I've experienced a 7% ROI, and it surpasses previous software solutions in stability and manageability.