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 7.2, while Fortinet is ranked #7 with an average rating of 8.2. AT&T holds a 1.9% mindshare in SIEM, compared to Fortinet’s 2.8% mindshare. Additionally, 80% of AT&T users are willing to recommend the solution, compared to 83% of Fortinet users who would recommend it.

AlienVault OSSIM

Read 31 AlienVault OSSIM reviews

4,311 Views
4,225 Comparison Views

80% willing to recommend

Fortinet FortiSIEM

Read 76 Fortinet FortiSIEM reviews

5,718 Views
4,231 Comparison Views

83% 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: December 2025).

Buyer's Guide

AlienVault OSSIM vs. Fortinet FortiSIEM

December 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

6.2

Number of Reviews

Ranking in other categories

AI Observability (5th)

Mindshare comparison

As of January 2026, in the Security Information and Event Management (SIEM) category, the mindshare of AlienVault OSSIM is 1.9%, down from 4.3% compared to the previous year. The mindshare of Fortinet FortiSIEM is 2.8%, down from 3.0% 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	2.8%
AlienVault OSSIM	1.9%
Other	95.3%

Security Information and Event Management (SIEM)

Featured Reviews

Brandon Pearce

Independent Contractor at a comms service provider with 5,001-10,000 employees

Enables cost-effective security management for small businesses

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 implementation. The main area where the AlienVault product was lacking around the 2018 timeframe was in its ability to scale. By pushing it to a cloud-based system, they've largely alleviated scale issues. It's native in Amazon but will also run in Azure. They have worked with cloud service providers to offer enough throughput at a cost reasonable for a corporation. Scaling was their biggest problem, and they've largely conquered those issues.

Read full review

SaurabhYadav5

Network Engineer at Ogma Consulting

Comprehensive monitoring boosts security, yet incident management features need expansion

Fortinet FortiSIEM should broaden its remediation part to include more features for incident management. Currently, to manage repetitive incidents or for remediation, I need to use a separate software called FortiSOAR. Additionally, the search functionality in FortiAI should be improved to provide more precise results, making it easier for me to understand what actions need to be taken.

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

"The paid version of the solution has reporting and better scalability options."

"The solution is free to use."

"The product is easy to use."

"Network traffic analysis is highly efficient."

"The most valuable features of AlienVault OSSIM are vulnerability assessment, network intrusion detection system, response to critical events, and awareness of the whole network."

"The most valuable feature is the logging capability."

"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 open vault component and the checking of vulnerabilities are the most valuable features. The page management helps with this. If you know how your device is vulnerable at least you can do something about it."

More AlienVault OSSIM pros

"Both the collecting logs and duo correlation are valuable features for us."

"It's very easy for anyone to work with."

"The CMDB and the device discovery features are most valuable."

"The stability is very reliable. It offers very good performance."

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

"One of the most valuable features is that we can combine SOC and NOC operations in the same tool. We can provide NOC and SOC services in the same tool for two separate teams. There are plenty of third-party solutions that integrate with FortiSIEM. All these solutions already have a ready integration, and we have the possibility to create a custom connector for these solutions. Its reports are also very good."

"FortiSIEM's best features are the dashboards and customization."

"The solution is very stable. It's run for years without the need to do anything except, add new patches when they are available, which are always a good idea to install."

More Fortinet FortiSIEM pros

Cons

"It's so hard to configure and explore something new on it."

"The initial setup was a bit complex. You've got to do a lot of reading. It's not an intuitive implementation."

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

"The main area where the AlienVault product was lacking around the 2018 timeframe was in its ability to scale."

"They can add more compliance templates."

"The solution needs more integration with cyber intelligence systems."

"The correlation engine needs to be improved."

"The solution is not scalable."

More AlienVault OSSIM cons

"The stability of the product is an area of concern where improvements are required."

"The reporting feature is not very attractive for the upper management and I am not able to perform complex/nested queries."

"If there is a configuration on the wrong side of the network or there are changes that result in harm to our IT infrastructure, the solution should immediately fix it."

"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."

"Our team tried configuring MS SQL database logs with Fortinet FortiSIEM, but it did not work for some time."

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

"The process of installing Fortinet FortiSIEM and the customization of the alerts take too long."

"Customer support service could be better."

More Fortinet FortiSIEM cons

Pricing and Cost Advice

"The price of AlienVault OSSIM is too high sometimes for us to present to our customers. The price should be lower. We are on a three-year license to use the solution. We had to pay extra for the support."

"AlienVault OSSIM is free."

"AlienVault OSSIM is an open-source solution."

"I used the paid version of the tool and found it to be expensive. It has been a while since I changed to Securonix. I will have to check whether AlienVault charges per device, user, or log."

"AlienVault pricing is the best. Whatever cost you are paying, you are getting a return on every penny... It's not like your IBM, your QRadar, or Splunk, where the cost is too high."

"OSSIM is free."

"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."

"The tool's licensing costs are yearly."

More AlienVault OSSIM pricing and cost advice

"The price is competitive."

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

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

"The price of Fortinet FortiSIEM is a lot less when compared to other solutions."

"The solution is available for both, perpetual and subscription licenses."

"Fortinet FortiSIEM is cheaper compared to other products."

"There is a need to make yearly payments towards the licensing charges attached to the product. The free version license of the product is available for two months."

"Pricing is acceptable for more than 90% of our customers, as they normally get discounts."

More Fortinet FortiSIEM pricing and cost advice

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Top Industries

By visitors reading reviews

Computer Software Company

13%

Comms Service Provider

12%

Financial Services Firm

Manufacturing Company

Computer Software Company

12%

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	22
Large Enterprise	24

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...

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What needs improvement with AlienVault OSSIM?

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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?

My experience with pricing, setup cost, and licensing for Fortinet FortiSIEM is wonderful, as it offers an excellent license compared to other vendors.

See all answers

What needs improvement with Fortinet FortiSIEM?

Fortinet FortiSIEM is great overall. Performance could be enhanced, but I do not wish to elaborate on needed improvements.

See all answers

Comparisons

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Compared 51% of the time

Venusense USM vs AlienVault OSSIM

Compared 9% of the time

USM Anywhere vs AlienVault OSSIM

Compared 7% of the time

Splunk Enterprise Security vs AlienVault OSSIM

Compared 7% of the time

SolarWinds Security Event Manager vs AlienVault OSSIM

Compared 2% of the time

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IBM Security QRadar vs Fortinet FortiSIEM

Compared 9% of the time

Splunk Enterprise Security vs Fortinet FortiSIEM

Compared 9% of the time

Wazuh vs Fortinet FortiSIEM

Compared 8% of the time

ManageEngine Log360 vs Fortinet FortiSIEM

Compared 6% of the time

LogRhythm SIEM vs Fortinet FortiSIEM

Compared 5% of the time

More Fortinet FortiSIEM Competitors

Product Reports

Buyer's Guide

AlienVault OSSIM

January 2026

Download AlienVault OSSIM product report

Buyer's Guide

Fortinet FortiSIEM

January 2026

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

December 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: December 2025.

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