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 most valuable features of AlienVault OSSIM are case management, ease of configuration, and investigation."

"Its user-friendliness is the most valuable. It is very easy to use and explore. The dashboard is very well packaged and integrated. You don't have to spend a lot of time in configuring it and checking out the RPM etc. It is also free and very powerful."

"With AlienVault you get everything in one box."

"Inbuilt IDS, inbuilt integration with threat intelligence platform and with vulnerability assessment modules."

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

"The solution is free to use."

"The product is easy to use."

"The initial setup was straightforward. I didn't have any problems."

More AlienVault OSSIM pros

"The seamless integration with FortiGate is the solution's most valuable aspect."

"It gives us the opportunity to generate notifications based upon rules that get triggered, and the rules could be specific to PCI, HIPAA, GIBA, NIST, and so forth."

"FortiSIEM sends an email or SMS notifications to admins when there are significant incidents. It's a highly efficient way of responding to incidents."

"FortiSIEM helped us discover all the threats at the time that were attacking the IT services of the company. We now have multiple-level authentication."

"To add workers and even collectors is pretty easy."

"FortiSIEM's log correlation is good."

"The most valuable features for us are the built-in reports and alerts, along with the extreme flexibility in reporting and rule generation."

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

More Fortinet FortiSIEM pros

Cons

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

"AlienVault OSSIM gives unwanted notifications."

"The user interface could be improved."

"It's under heavy traffic. If you have heavy traffic, the system is slow."

"I don't like to work on OSSIM because it is unpredictable."

"The user interface needs to be friendlier across the board."

"AlienVault OSSIM is costly."

"We need more dashboards and we need more customization for dashboards."

More AlienVault OSSIM cons

"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"

"The backup and recovery process for this solution needs improvement."

"The solution's technical support didn't help our company a lot."

"Performance could be enhanced, but I do not wish to elaborate on needed improvements."

"They need to integrate better with Cisco and Palo Alto."

"There could be improvements like introducing some solutions directly into FortiSIEM to avoid the need for separately purchasing additional tools like FortiStore."

"An improvement would be if FortiSIEM's licensing was based on the number of nodes rather than the EPS."

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

More Fortinet FortiSIEM cons

Pricing and Cost Advice

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

"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."

"AlienVault OSSIM is expensive compared to its competitors."

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

"When comparing AlienVault OSSIM to Microsoft Sentinel, AlienVault OSSIM incurs additional costs due to its licensing price structure. If you are using AlienVault for security purposes at a certain level it can have a higher price point than the current pricing of Microsoft Sentinel."

"OSSIM is free."

"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 OSSIM is an open-source solution."

More AlienVault OSSIM pricing and cost advice

"Pricing is determined based on the customer's budget."

"The price of Fortinet FortiSIEM was reasonable compared to other solutions."

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

"We pay for a license for FortiSIEM. We pay for the license and renewal."

"This is probably more on the lower cost end of the spectrum compared to competing products. Fortinet's license model is based on events per second, which makes sense, but that's not typical. It makes it very hard to calculate what your costs are going to be as you scale the platform because some log sources, such as firewall logs, are very noisy, and there are lots and lots of events per second, but some of them are not. So, it becomes a bit of a science experiment trying to guess what your costs are going to be as you scale the solution. This is where other competing products perhaps have a more straightforward license model."

"The price is competitive."

"FortiSIEM's licensing is based on EPS, and its pricing is competitive in the market."

"Its price can be better. We are Fortinet partners, so we can get discounts, but its price can be an issue at the beginning for others. There is a licensing scheme for every case. There are three licensing schemes that we can choose from."

More Fortinet FortiSIEM pricing and cost advice

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Top Industries

By visitors reading reviews

Computer Software Company

13%

Comms Service Provider

13%

Financial Services Firm

Manufacturing Company

Computer Software Company

12%

Financial Services Firm

10%

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...

See all answers

What needs improvement with AlienVault OSSIM?

See all answers

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 8% of the time

Splunk Enterprise Security vs AlienVault OSSIM

Compared 7% of the time

IBM Security QRadar vs AlienVault OSSIM

Compared 2% of the time

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IBM Security QRadar vs Fortinet FortiSIEM

Compared 10% 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

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Product Reports

Buyer's Guide

AlienVault OSSIM

December 2025

Download AlienVault OSSIM product report

Buyer's Guide

Fortinet FortiSIEM

December 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

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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