AlienVault OSSIM vs Fortinet FortiSIEM comparison

AT&T and Fortinet are both solutions in the Security Information and Event Management (SIEM) category. AT&T is ranked #12 with an average rating of 7.4, while Fortinet is ranked #7 with an average rating of 8.1. AT&T holds a 2.4% mindshare in SIEM, compared to Fortinet’s 3.2% mindshare. Additionally, 80% of AT&T users are willing to recommend the solution, compared to 82% of Fortinet users who would recommend it.

AlienVault OSSIM

Read 31 AlienVault OSSIM reviews

4,632 Views
4,539 Comparison Views

80% willing to recommend

Fortinet FortiSIEM

Read 75 Fortinet FortiSIEM reviews

5,537 Views
4,042 Comparison Views

82% willing to recommend

AlienVault OSSIM

Fortinet FortiSIEM

Comparison Buyer's Guide

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Executive SummaryUpdated on Sep 18, 2024

Fortinet FortiSIEM and AlienVault OSSIM are two prominent SIEM solutions. Fortinet FortiSIEM appears to have the upper hand due to its ease of deployment and customer service.

Features: Fortinet FortiSIEM offers comprehensive alerting, robust integration capabilities, and intuitive configuration. AlienVault OSSIM provides extensive threat intelligence, powerful reporting tools, and a rich feature set.

Room for Improvement: Fortinet FortiSIEM could improve scalability, refine its analytics, and enhance its documentation. AlienVault OSSIM needs to lower its learning curve, improve its documentation, and simplify its deployment.

Ease of Deployment and Customer Service: Fortinet FortiSIEM is noted for its smooth deployment process and excellent customer service, with straightforward implementation and responsive support. AlienVault OSSIM faces criticism for complex deployment and less accessible support.

Pricing and ROI: Fortinet FortiSIEM is recognized for competitive pricing and a solid return on investment. AlienVault OSSIM, although more expensive upfront, is considered worth the price for its feature-rich offering, but its complexity and support challenges can impact the overall ROI.

To learn more, read our detailed AlienVault OSSIM vs. Fortinet FortiSIEM Report (Updated: September 2025).

Buyer's Guide

AlienVault OSSIM vs. Fortinet FortiSIEM

September 2025

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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

AlienVault OSSIM

Ranking in Security Information and Event Management (SIEM)

12th

Average Rating

7.4

Reviews Sentiment

7.1

Number of Reviews

Ranking in other categories

No ranking in other categories

Fortinet FortiSIEM

Ranking in Security Information and Event Management (SIEM)

7th

Average Rating

7.6

Reviews Sentiment

5.8

Number of Reviews

Ranking in other categories

No ranking in other categories

Mindshare comparison

As of November 2025, in the Security Information and Event Management (SIEM) category, the mindshare of AlienVault OSSIM is 2.4%, down from 4.3% compared to the previous year. The mindshare of Fortinet FortiSIEM is 3.2%, up from 2.9% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Security Information and Event Management (SIEM) Market Share Distribution
Product	Market Share (%)
Fortinet FortiSIEM	3.2%
AlienVault OSSIM	2.4%
Other	94.4%

Security Information and Event Management (SIEM)

Featured Reviews

HarshBhardiya

SOC Engineer at a outsourcing company with 10,001+ employees

An open-source solution that provide good detection and more visibility

The solution is not scalable. It impacts so hard. In the initial stages, AlienVault OSSIM can be suitable for small environments. There may be limitations if the customer expresses a desire to expand and add more devices. In such cases, we would need to either explore additional solutions or work within the constraints of the existing setup. We have set up alerts and configured everything in AlienVault OSSIM. It actively monitors for any security incidents. It provides us with regular updates and notifications about any ongoing activities. Only one person is using the solution. It is the perfect solution for small businesses. I rate the solution’s scalability a three out of ten.

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Oliver Jackson

Network Engineer at Laminar Communications Pty Ltd

Systems monitoring enhanced by firewall and intrusion detection features

My primary use case for Fortinet FortiSIEM is systems monitoring and alerting. I use it for standard functions like log monitoring, incident detection, and notification. My customers are mostly medium-sized enterprises ranging from engineering companies, mining companies, independent schools, and…

Read full review

Quotes from Members

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

Pros

"There are a lot of people you will find using OSSIM since they are also offering OTX as a service"

"It has helped us remediate threats in the past by providing significant events that assisted in identifying suspicious activities, such as logins from multiple countries."

"The solution is very stable. Compared to Qradar and Splunk, it's very stable."

"The initial setup is straightforward."

"The product is majorly used for threat detection of the agents on servers and endpoints."

"The threat policies of the solution are always very advanced and the best in the market. They are very persistent in terms of keeping up with security protocols."

"Asset discovery is good."

"Network traffic analysis is highly efficient."

More AlienVault OSSIM pros

"It's easy to manage. There's a web interface and a command line, depending on what the user is comfortable with. There's a large knowledge base available, and the support is timely."

"The most valuable features of the solution is its integration with other technologies, especially its ability to collect logs from Cisco and Aruba devices along with Fortinet products."

"The most valuable feature is auto-discovery. When you send logs from any device to port 514, it helps register those devices automatically."

"The interface is very easy to use. The connector in the core has FortiSIEM support from the vendor."

"FortiSIEM's log correlation is good."

"It detects new technologies, vulnerabilities, and emerging threats on the internet."

"Fortinet FortiSIEM is less costly than other products and is available 24/7."

"The primary valuable feature is that it has replaced a whole lot of other products with one platform."

More Fortinet FortiSIEM pros

Cons

"AlienVault OSSIM’s configuration and integration could be a little easier."

"They can add more compliance templates."

"AlienVault OSSIM could improve by having better integration with some of the newer tools."

"The correlation engine needs to be improved."

"The user interface could be improved."

"It takes some time. It does not give me a prompt response for any such [malicious] traffic. It takes time to get that alert from the AlienVault system."

"Sometimes technical issues take very long to get resolved."

"I would like the solution to be able to integrate with my firewall, my IDS and my Honeypot solutions so that it can provide real-time reporting as things occur and then have alert sent to me on my phone when suspicious activity is happening."

More AlienVault OSSIM cons

"The UI could improve in Fortinet FortiSIEM. Humans view the UI frequently for data and if it was more visually pleasing it would be beneficial."

"Creating parsers to try make unknown events or currently unsupported devices produce meaningful information is extremely cumbersome."

"Fortinet FortiSIEM needs to provide better API integrations to users."

"The biggest thing that could be better is a quicker response to support cases."

"Their product support, in general, is not that great. The product support is in the same ecosystem. Their support is improving but it's not that great.vvv"

"When our team tried configuring logs for Microsoft SQL, it did not work."

"The built-in APIs in Fortinet FortiSIEM are somewhat lacking and could be improved for better integration with external ITSM products."

"The tool's technical team's response time is too high, and they are not available even when they know that there are many pending issues."

More Fortinet FortiSIEM cons

Pricing and Cost Advice

"OSSIM is open source, and USM is the paid license. So, if you want, you can switch to USM. There you will have to buy a license, and they have a support team that helps you out on issues you face."

"We are using the community version, which can be used for free."

"The solution is open source, so it's free to use."

"The licensing fees for the non-community edition are paid on an annual basis, and there are no costs in addition to this."

"The tool's licensing costs are yearly."

"OSSIM is free."

"AlienVault OSSIM is free."

"We are using a free version of the solution. If you purchase a license there are more features available but the price is a little high. The solution should be cheaper to allow more customers to be able to afford it."

More AlienVault OSSIM pricing and cost advice

"They have a yearly subscription."

"Manageable, however would be better as pay as you go versus CapEX."

"Fortinet FortiSIEM is very cost-efficient compared to other SIEM solutions."

"Fortinet's products are not expensive, it is less than the competition."

"There are additional features that cost more than the standard licensing fees."

"Fortinet FortiSIEM is cheaper compared to other products."

"We bought the perpetual license, so we own the product, but there is a three-year support renewal fee for that."

"If one is cheap and ten is expensive. I rate the tool's price as an eight out of ten. Compared with Splunk or Oracle, Fortinet is cheap."

More Fortinet FortiSIEM pricing and cost advice

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Top Industries

By visitors reading reviews

Computer Software Company

14%

Comms Service Provider

12%

University

Financial Services Firm

Computer Software Company

13%

Financial Services Firm

Comms Service Provider

Government

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

By reviewers
Company Size	Count
Small Business	18
Midsize Enterprise	9
Large Enterprise	8

By reviewers
Company Size	Count
Small Business	34
Midsize Enterprise	21
Large Enterprise	23

Questions from the Community

What do you like most about AlienVault OSSIM?

Asset discovery is good.

See all answers

What is your experience regarding pricing and costs for AlienVault OSSIM?

It depends. I would need to review their cost models, but generally, they are on a scaled basis based on throughput usage. Because it's a software as a service solution for their core product for U...

See all answers

What needs improvement with AlienVault OSSIM?

Scaling for USM is always challenging for any product unless it is purpose-built or overbuilt at the front end. They will use Palo Alto and its competitors, and LevelBlue will manage that implement...

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What do you like most about Fortinet FortiSIEM?

Fortinet FortiSIEM needs to provide better API integrations to users.

See all answers

What is your experience regarding pricing and costs for Fortinet FortiSIEM?

I am not familiar with the price and cost of Fortinet FortiSIEM. I cannot tell you if it is high, expensive, or low. However, I can say that it is cost-effective as it provides everything needed.

See all answers

What needs improvement with Fortinet FortiSIEM?

Regarding Fortinet FortiSIEM, I cannot identify any specific areas for improvement because I can find everything I need. For the time being, I cannot find a real point for improvement. Everything i...

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Compared 10% of the time

ManageEngine Log360 vs Fortinet FortiSIEM

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Product Reports

Buyer's Guide

AlienVault OSSIM

November 2025

Download AlienVault OSSIM product report

Buyer's Guide

Fortinet FortiSIEM

November 2025

Download Fortinet FortiSIEM product report

Also Known As

OSSIM

FortiSIEM, AccelOps

Overview

AlienVault OSSIM, Open Source Security Information and Event Management (SIEM), provides you with a feature-rich open source SIEM complete with event collection, normalization and correlation. Launched by security engineers because of the lack of available open source products, AlienVault OSSIM was created specifically to address the reality many security professionals face: A SIEM, whether it is open source or commercial, is virtually useless without the basic security controls necessary for security visibility.

AT&T

FortiSIEM (formerly AccelOps 4) provides an actionable security intelligence platform to monitor security, performance and compliance through a single pane of glass.

Companies around the world use FortiSIEM for the following use cases:

Threat management and intelligence that provide situational awareness and anomaly detection
Alleviating compliance mandate concerns for PCI, HIPAA and SOX
Managing “alert overload”
Handling the “too many tools” reporting issue
Addressing the MSPs/MSSPs pain of meeting service level agreements

Fortinet

Sample Customers

Council Rock School District

FortiSIEM has hundreds of customers worldwide in markets including managed services, technology, financial services, healthcare, and government. Customers include Aruba Networks, Compushare, Port of San Diego, Cleveland Indians, Infoblox, Healthways, and Referentia.

Buyer's Guide

AlienVault OSSIM vs. Fortinet FortiSIEM

September 2025

Free Report: AlienVault OSSIM vs. Fortinet FortiSIEM

Find out what your peers are saying about AlienVault OSSIM vs. Fortinet FortiSIEM and other solutions. Updated: September 2025.

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