Best Free SIEM Software of 2025

Empower Your Existing Team to Achieve Enterprise-Level Security with Blumira's SIEM Solution Introducing a comprehensive platform that combines SIEM, endpoint monitoring, round-the-clock surveillance, and automated incident response, designed to simplify your security management, enhance visibility, and accelerate response times. Let us take care of the complex security tasks so you can focus on what matters most. With our SIEM's ready-to-use detections, curated alerts, and predefined response strategies, IT teams can unlock significant security benefits with Blumira. Swift Implementation, Instant Results: Our SIEM seamlessly integrates with your existing technology infrastructure and can be fully operational in just hours, with no lengthy setup required. Unlimited Data Ingestion: Enjoy predictable pricing and unrestricted data logging for a SIEM that offers comprehensive lifecycle detection. Simplified Compliance: Benefit from a year of data retention, pre-configured reports, and continuous automated monitoring. Exceptional Support with 99.7% CSAT Rating: Our Solution Architects provide product support, our Incident Detection and Response Team develops new detection capabilities, and we offer 24/7 SecOps assistance.

Log360 is a SIEM or security analytics solution that helps you combat threats on premises, in the cloud, or in a hybrid environment. It also helps organizations adhere to compliance mandates such as PCI DSS, HIPAA, GDPR and more. You can customize the solution to cater to your unique use cases and protect your sensitive data. With Log360, you can monitor and audit activities that occur in your Active Directory, network devices, employee workstations, file servers, databases, Microsoft 365 environment, cloud services and more. Log360 correlates log data from different devices to detect complex attack patterns and advanced persistent threats. The solution also comes with a machine learning based behavioral analytics that detects user and entity behavior anomalies, and couples them with a risk score. The security analytics are presented in the form of more than 1000 pre-defined, actionable reports. Log forensics can be performed to get to the root cause of a security challenge. The built-in incident management system allows you to automate the remediation response with intelligent workflows and integrations with popular ticketing tools.

ADAudit Plus provides full visibility into all activities and helps to keep your Windows Server ecosystem safe and compliant. ADAudit Plus gives you a clear view of all changes to your AD resources, including AD objects and their attributes, group policies, and more. AD auditing can help you detect and respond to insider threats, privilege misuse, or other indicators of compromise. You will have a detailed view of everything in AD, including users, computers, groups and OUs, GPOs. Audit user management actions, including deletion, password resets and permission changes. Also, details about who, what, when and where. To ensure that users have only the minimum privileges, keep track of who is added and removed from security or distribution groups.

EventLog Analyzer from Manage Engine is the industry's most affordable security information and event management software (SIEM). This cloud-based, secure solution provides all essential SIEM capabilities, including log analysis, log consolidation, user activity monitoring and file integrity monitoring. It also supports event correlation, log log forensics and log retention. Real-time alerting is possible with this powerful and secure solution. Manage Engine's EventLog Analyzer allows users to prevent data breaches, detect the root cause of security issues, and mitigate sophisticated cyber-attacks.

Sumo Logic is a cloud-based solution for log management and monitoring for IT and security departments of all sizes. Integrated logs, metrics, and traces allow for faster troubleshooting. One platform. Multiple uses. You can increase your troubleshooting efficiency. Sumo Logic can help you reduce downtime, move from reactive to proactive monitoring, and use cloud-based modern analytics powered with machine learning to improve your troubleshooting. Sumo Logic Security Analytics allows you to quickly detect Indicators of Compromise, accelerate investigation, and ensure compliance. Sumo Logic's real time analytics platform allows you to make data-driven business decisions. You can also predict and analyze customer behavior. Sumo Logic's platform allows you to make data-driven business decisions and reduce the time it takes to investigate operational and security issues, so you have more time for other important activities.

Standing watch, at your side. Intelligent security analytics for your entire organization. With SIEM reinvented for modern times, you can see and stop threats before they cause damage. Microsoft Sentinel gives you a birds-eye view of the entire enterprise. Use the cloud and large-scale intelligence gleaned from decades of Microsoft security expertise to your advantage. Artificial intelligence (AI) will make your threat detection and response faster and more efficient. Reduce the time and cost of security infrastructure setup and maintenance. You can elastically scale your security needs to meet them, while reducing IT costs. Collect data at cloud scale - across all users, devices and applications, on-premises or in multiple clouds. Using Microsoft's unparalleled threat intelligence and analytics, detect previously discovered threats and reduce false positives. Microsoft's decades of cybersecurity experience allows you to investigate threats and track suspicious activities on a large scale.

Accelerate the transition from data to tangible business results with Splunk. Splunk Enterprise streamlines the process of gathering, analyzing, and leveraging the hidden potential of the vast data created by your technological framework, security measures, and enterprise applications—equipping you with the knowledge necessary to enhance operational efficiency and achieve business objectives. Effortlessly gather and index log and machine data from a variety of sources. Merge your machine data with information stored in relational databases, data warehouses, as well as Hadoop and NoSQL data repositories. The platform's multi-site clustering and automatic load balancing capabilities are designed to accommodate hundreds of terabytes of data daily, ensuring quick response times and uninterrupted access. Customizing Splunk Enterprise to suit various project requirements is straightforward with the Splunk platform. Developers have the flexibility to create bespoke Splunk applications or incorporate Splunk data into existing applications. Furthermore, applications developed by Splunk, our collaborators, and the community enhance and expand the functionalities of the Splunk platform, making it a versatile tool for organizations of all sizes. This adaptability ensures that users can extract maximum value from their data in a rapidly changing business landscape.

Built on the powerful Graylog Platform, Graylog Security is a leading threat detection, investigation, and response (TDIR) solution that streamlines cybersecurity operations with an intuitive workflow, seamless analyst experience, and cost efficiency. It helps security teams reduce risk and improve key metrics like Mean Time to Detect (MTTD) by optimizing threat detection coverage while lowering Total Cost of Ownership (TCO) through native data routing and tiering. Additionally, Graylog Security accelerates incident response by enabling analysts to quickly address critical alerts, reducing Mean Time to Response (MTTR). With integrated SOAR capabilities, Graylog Security automates repetitive tasks, orchestrates workflows, and enhances response efficiency, empowering organizations to proactively detect and neutralize cybersecurity threats.

DNIF offers a highly valuable solution by integrating SIEM, UEBA, and SOAR technologies into a single product, all while maintaining an impressively low total cost of ownership. The platform's hyper-scalable data lake is perfectly suited for the ingestion and storage of vast amounts of data, enabling users to identify suspicious activities through statistical analysis and take proactive measures to mitigate potential harm. It allows for the orchestration of processes, personnel, and technological initiatives from a unified security dashboard. Furthermore, your SIEM comes equipped with vital dashboards, reports, and response workflows out of the box, ensuring comprehensive coverage for threat hunting, compliance, user behavior tracking, and network traffic anomalies. The inclusion of a detailed coverage map aligned with the MITRE ATT&CK and CAPEC frameworks enhances its effectiveness even further. Expand your logging capabilities without the stress of exceeding your budget—potentially doubling or even tripling your capacity within the same financial constraints. Thanks to HYPERCLOUD, the anxiety of missing out on critical information is now a relic of the past, as you can log everything and ensure nothing goes unnoticed, solidifying your security posture.

Hybrid SIEM solutions combine real-time log monitoring with comprehensive system and network monitoring to provide users with a complete view of their servers, endpoints, and networks. The security event log normalization and correlation engine with descriptive emails alerts provides additional context. It presents cryptic Windows security incidents in easy-to-understand reports that provide insight beyond what is available as raw events. EventSentry's NetFlow component visualizes network traffic and can detect malicious activity. It also provides insight into bandwidth usage. EventSentry's ADMonitor component makes it easy to keep track of Active Directory changes. It records all changes to Group Policy objects and provides a complete user inventory that can be used to identify old accounts. There are many integrations and multi-tenancy options.

Open source is a passion for engineers. We supercharged the top open-source monitoring tools, including Jaeger, Prometheus and ELK, and combined them into a scalable SaaS platform. You can collect and analyze all your logs, metrics, traces and other data on one platform for end to end monitoring. You can visualize your data using customizable and easy-to-use monitoring dashboards. Logz.io's AI/ML human-coach automatically detects and corrects any errors or exceptions in your logs. Alerting to Slack and PagerDuty, Gmail and other endpoints allows you to quickly respond to new events. Centralize your metrics at any scale on Prometheus-as-a-service. Unified with logs, traces. Just three lines of code are required to add to your Prometheus config file to start forwarding your metrics and data to Logz.io.

SOC Prime equips security teams with the largest and most robust platform for collective cyber defense that cultivates collaboration from a global cybersecurity community and curates the most up-to-date Sigma rules compatible with over 28 SIEM, EDR, and XDR platforms. Backed by a zero-trust approach and cutting-edge technology powered by Sigma and MITRE ATT&CK®️, SOC Prime enables smart data orchestration, cost-efficient threat hunting, and dynamic attack surface visibility to maximize the ROI of SIEM, EDR, XDR & Data Lake solutions while boosting detection engineering efficiency. SOC Prime’s innovation is recognized by independent research companies, credited by the leading SIEM, XDR & MDR vendors, and trusted by 8,000+ organizations from 155 countries, including 42% of Fortune 100, 21% of Forbes Global 2000, 90+ public sector institutions, and 300+ MSSP and MDR providers. SOC Prime is backed by DNX Ventures, Streamlined Ventures, and Rembrandt Venture Partners, having received $11.5M in funding in October 2021. Driven by its advanced cybersecurity solutions, Threat Detection Marketplace, Uncoder AI, and Attack Detective, SOC Prime enables organizations to risk-optimize their cybersecurity posture.

A centralized management dashboard provides comprehensive visibility across the entire organization. All solutions within the technology stack are seamlessly integrated and communicate with a central database, enhancing efficiency in daily operations like monitoring, investigations, and incident response. The system employs both active and passive vulnerability scanners for early detection, along with pre-configured reports to assist in compliance audits. Users can effectively track and manage account access and changes in permissions, ensuring robust security measures are in place. Alerts are generated for any suspicious activities, allowing for timely intervention. Moreover, the dashboard enables remote management of the environment, facilitating prompt responses to potential attacks. It also includes a feature to monitor changes and access to sensitive information, ensuring that all classified data remains secure. Additionally, advanced threat protection safeguards endpoints and servers against emerging threats, creating a fortified security posture for the organization. Overall, this integrated approach not only streamlines processes but also significantly enhances the organization's ability to respond to and mitigate risks.

Strengthen and enhance your cybersecurity framework with Zercurity, allowing you to minimize the time and resources dedicated to overseeing, managing, and navigating the various aspects of cybersecurity within your organization. Obtain actionable data points that provide a clear snapshot of your existing IT infrastructure, with automatic analysis of assets, applications, packages, and devices. Our advanced algorithms will execute queries across your resources, promptly identifying anomalies and vulnerabilities as they arise. Safeguard your organization by revealing potential threats and mitigating associated risks effectively. With automatic reporting and auditing features, remediation processes become more efficient and manageable. Experience comprehensive security monitoring that covers all areas of your organization, enabling you to query your infrastructure as if it were a database. Receive immediate answers to your most challenging inquiries while continuously measuring your risk exposure in real-time. Stop speculating about where your cybersecurity vulnerabilities may exist and gain profound insights into every aspect of your organization’s security posture. Zercurity empowers you to stay ahead of threats, ensuring that your defenses are always on alert.

We reexamined every premise surrounding SIEM and completely reconstructed it from scratch. The outcome is an enhanced security data platform that is quicker, more cost-effective, and offers superior accuracy in threat detection. Cyber attackers are increasingly employing basic methods to infiltrate systems, often by accessing legitimate user accounts and exploiting them for lateral movement. Identifying these breaches poses a challenge even for highly skilled security teams. RunReveal aggregates all your log data, sifts through irrelevant information, and highlights the critical activities occurring within your systems. Regardless of whether you're dealing with petabytes or gigabytes of data, RunReveal can seamlessly correlate threats across various log sources, providing you with high-quality alerts right out of the box. We have committed resources to robust security measures, establishing a solid foundation for our security initiatives. Our guiding principle is that enhancing our security framework not only protects us but also deepens our understanding of our customers' needs. This approach ensures we remain proactive in addressing potential threats and continuously improving our services to better serve those we protect.

The leading SIEM solution offers extensive visibility, enhances detection accuracy through contextual insights, and boosts operational effectiveness. Its unparalleled visibility is achieved by efficiently aggregating, normalizing, and analyzing data from diverse sources at scale, all thanks to Splunk's robust, data-driven platform equipped with advanced AI features. By employing risk-based alerting (RBA), a unique functionality of Splunk Enterprise Security, organizations can significantly decrease alert volumes by as much as 90%, allowing them to focus on the most critical threats. This capability not only enhances productivity but also ensures that the threats being monitored are of high fidelity. Furthermore, the seamless integration with Splunk SOAR automation playbooks and the case management features of Splunk Enterprise Security and Mission Control creates a cohesive work environment. By optimizing the mean time to detect (MTTD) and mean time to respond (MTTR) for incidents, teams can enhance their overall incident management effectiveness. This comprehensive approach ultimately leads to a more proactive security posture that can adapt to evolving threats.

Enhance your security posture with LevelBlue USM Anywhere, a cutting-edge open XDR platform tailored to adapt to the dynamic nature of your IT environment and the increasing demands of your enterprise. Featuring advanced analytics, comprehensive security orchestration, and automation capabilities, USM Anywhere provides integrated threat intelligence that accelerates and sharpens threat detection while facilitating smoother response management. Its unparalleled flexibility is highlighted by a wide array of integrations, known as BlueApps, which improve its detection and orchestration capabilities across numerous third-party security and productivity applications. Additionally, these integrations allow for seamless triggering of automated and orchestrated responses, making security management more efficient. Take advantage of a 14-day free trial today to see how our platform can transform your approach to cybersecurity and help you stay ahead of potential threats.

M365 Manager Plus is a comprehensive Microsoft 365 tool that can be used to report, manage, monitor, audit, and create alerts for critical activities. It is easy to manage Microsoft 365 services such as Exchange Online, OneDrive for Business and Skype for Business from one place. M365 Manager Plus offers extensive pre-configured reports on Microsoft 365. It helps you perform complex tasks such as bulk user management, bulk mail management, secure delegation, and bulk mailbox management. You can monitor Microsoft 365 services 24/7 and receive email notifications about service interruptions. M365 Manager Plus simplifies compliance management with built in compliance reports. It also offers advanced auditing, alerting, and reporting features to help keep your Microsoft 365 setup safe.

Altoverra will help you to enhance your digital landscape. We make it easy. Our Managed SIEM harmonizes cybersecurity, preventing threats while your business operates seamlessly.