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 solution has a very good open source community, and whenever we have problems, we are always able to resolve it online."

"Asset discovery is good."

"AlienVault OSSIM is an enterprise solution that sells easily. It is rated highly by organizations."

"OSSIM is the only solution that includes the large number of modules that we need: a vulnerability scanner, a network IDS system, a host IDS system."

"The initial setup is straightforward."

"The most valuable feature is the logging capability."

"I recommend it due to the experience of the people running it."

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

More AlienVault OSSIM pros

"It's a very nice solution to work with."

"The product's initial setup phase was easy."

"The most valuable feature of Fortinet FortiSIEM is the user and entity behave as analytics(UEBA). This feature mixes your data and provides useful information based on the behavior of the targeted."

"The most valuable feature is the ability to view all the network events on a single pane and find the point of contact or point of the incident."

"We have many application systems, and I can set up Fortinet FortiSIEM for users to monitor their systems."

"We have found the most important features in Fortinet FortiSIEM to be the correlation, file utility check, latest file, and hash changes. These features are important for us."

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

"The most valuable feature is the anomaly-reporting alarms."

More Fortinet FortiSIEM pros

Cons

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

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

"I suggest more in-built rules based on modern threats and environments to make it a more competitive solution."

"AlienVault OSSIM is costly."

"They can add more compliance templates."

"GUI could be improved."

"The incidence reporting could be better."

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

More AlienVault OSSIM cons

"Fortinet FortiSIEM is a little out of sight and needs more marketing efforts to be popular in the market."

"Our customers are noticing configuration available in the GUI interface and I think that they should be equal."

"The nodes on our network did not comply with the SIEM solution. They use a different format parking log."

"The deployment of the platform took some time to set up and configure."

"FortiSIEM is not a market leader in the SIEM space."

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

"They could work on their documentation. If there's anything about the solution that needs improvement, it's that. For example, documentation already is on a very high level but specifically on the CLI there are tons of features which can be fine-tuned and thousands of commands are very difficult to document. If they could make this easier, it would improve the overall solution."

"The policy editing should be easier. Right now, it's too hard."

More Fortinet FortiSIEM cons

Pricing and Cost Advice

"AlienVault 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 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."

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

"AlienVault OSSIM is an open-source solution."

"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 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."

"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."

More AlienVault OSSIM pricing and cost advice

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

"Fortinet FortiSIEM is cheaper compared to other products."

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

"The price is competitive."

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

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

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

"Fortinet FortiSIEM is not an expensive solution."

More Fortinet FortiSIEM pricing and cost advice

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Top Industries

By visitors reading reviews

Computer Software Company

13%

Comms Service Provider

11%

Financial Services Firm

Manufacturing Company

Computer Software Company

11%

Financial Services Firm

Comms Service Provider

Manufacturing Company

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?

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 47% 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 6% of the time

AWS Security Hub 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 7% of the time

LogRhythm SIEM vs Fortinet FortiSIEM

Compared 5% of the time

ManageEngine Log360 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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