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 #8 with an average rating of 7.9. AT&T holds a 1.6% mindshare in SIEM, compared to Fortinet’s 2.7% 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

4,307 Views
4,221 Comparison Views

80% willing to recommend

Fortinet FortiSIEM

Read 75 Fortinet FortiSIEM reviews

6,543 Views
4,842 Comparison Views

83% willing to recommend

AlienVault OSSIM

Fortinet FortiSIEM

Comparison Buyer's Guide

Download the report

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: March 2026).

Buyer's Guide

AlienVault OSSIM vs. Fortinet FortiSIEM

March 2026

Download the complete report

Helped 885,264 peers since 2012

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)

8th

Average Rating

7.6

Reviews Sentiment

6.2

Number of Reviews

Ranking in other categories

AI Observability (8th)

Mindshare comparison

As of March 2026, in the Security Information and Event Management (SIEM) category, the mindshare of AlienVault OSSIM is 1.6%, down from 4.1% compared to the previous year. The mindshare of Fortinet FortiSIEM is 2.7%, down from 3.1% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Security Information and Event Management (SIEM) Mindshare Distribution
Product	Mindshare (%)
Fortinet FortiSIEM	2.7%
AlienVault OSSIM	1.6%
Other	95.7%

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

"A very good feature of AlienVault OSSIM is that it has many domains that can be integrated from different solutions."

"Better than other SIEM solutions because almost everything can be integrated."

"You can customize the dashboards as well as the reporting."

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

"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."

"The most valuable features of this solution are the data correlation and vulnerability assessment."

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

"If you compare with other companies, like LogRhythm, etc., the top 8 or 10 CMs, I think AlienVault has the best price-performance ratio."

More AlienVault OSSIM pros

"In large-sized medium-sized and a small-sized organizations, it improves the ability to quickly drill down into events that occur, perform analysis, and find root cause."

"FortiSIEM's stability is quite good."

"Easy alert setup which enables different alerts in different categories."

"The product is quite well-organized. The GUI makes it easy to navigate."

"I like the various options, including the option for CMDB and the easier access to create rules, playbooks, or use cases, and it's also easier to use for creating dashboards and reports."

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

"It provides extensive logging and record-keeping for internal networks, cloud applications, and services as well as perimeter physical network security."

"The event correlation is pretty robust. The GUI is pretty good."

More Fortinet FortiSIEM pros

Cons

"Sometimes it takes very long for your issue to get resolved."

"There needs to be more support or some kind of training program so users can self-learn the system more effectively."

"The solution is not scalable."

"The solution needs more integration with cyber intelligence systems. Our customers want to use a single tool for managing cybersecurity."

"GUI could be improved."

"I would advise others to not implement it for any enterprise-level organization."

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

"AlienVault OSSIM is costly."

More AlienVault OSSIM cons

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

"The dashboards need to be improved. It gives you so much detail, but sometimes too much detail, especially to an executive, it's too much."

"The performance can be improved. Sometimes it takes a long time to fetch data."

"Fortinet FortiSIEM could improve by having better integration and extensions. This would benefit by allowing us to give more rules."

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

"Network detection and response is a separate product."

"They could work on their documentation. 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."

"Customer support service could be better."

More Fortinet FortiSIEM cons

Pricing and Cost Advice

"OSSIM is 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."

"AlienVault OSSIM is free."

"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 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."

"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 expensive compared to its competitors."

"The tool's licensing costs are yearly."

More AlienVault OSSIM pricing and cost advice

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

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

"They have a yearly subscription."

"The price is competitive."

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

"The tool is really expensive. For what the tool does for our team, the price is fair."

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

"Please be cheaper and more simplified."

More Fortinet FortiSIEM pricing and cost advice

See which vendors are best for you

Use our free recommendation engine to learn which Security Information and Event Management (SIEM) solutions are best for your needs.

See recommendations

885,264 professionals have used our research since 2012.

Top Industries

By visitors reading reviews

Comms Service Provider

12%

Manufacturing Company

Financial Services Firm

Computer Software Company

Comms Service Provider

Financial Services Firm

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...

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

Wazuh vs AlienVault OSSIM

Compared 30% of the time

Venusense USM vs AlienVault OSSIM

Compared 10% of the time

USM Anywhere vs AlienVault OSSIM

Compared 8% of the time

Splunk Enterprise Security vs AlienVault OSSIM

Compared 7% of the time

More AlienVault OSSIM Competitors

Splunk Enterprise Security vs Fortinet FortiSIEM

Compared 8% of the time

IBM Security QRadar vs Fortinet FortiSIEM

Compared 7% of the time

SentinelOne Singularity AI SIEM vs Fortinet FortiSIEM

Compared 7% of the time

Meraki Dashboard vs Fortinet FortiSIEM

Compared 5% of the time

Wazuh vs Fortinet FortiSIEM

Compared 5% of the time

More Fortinet FortiSIEM Competitors

Product Reports

Buyer's Guide

AlienVault OSSIM

March 2026

Download AlienVault OSSIM product report

Buyer's Guide

Fortinet FortiSIEM

March 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

March 2026

Free Report: AlienVault OSSIM vs. Fortinet FortiSIEM

Find out what your peers are saying about AlienVault OSSIM vs. Fortinet FortiSIEM and other solutions. Updated: March 2026.

DOWNLOAD NOW

885,264 professionals have used our research since 2012.

See our AlienVault OSSIM vs. Fortinet FortiSIEM report.

See our list of best Security Information and Event Management (SIEM) vendors.

We monitor all Security Information and Event Management (SIEM) reviews to prevent fraudulent reviews and keep review quality high. We do not post reviews by company employees or direct competitors. We validate each review for authenticity via cross-reference with LinkedIn, and personal follow-up with the reviewer when necessary.