List of the Top 18 Free SIEM Software in 2026

Graylog empowers security and IT teams to navigate the vast amounts of data generated by their systems every moment. Serving as an integrated SIEM and log management solution, Graylog gathers, standardizes, and links event data from all areas of the infrastructure—whether on-premises, in the cloud, or a hybrid setup. Analysts can quickly visualize activities, identify irregularities, and probe potential threats with AI-enhanced summaries, guided response workflows, and customizable dashboards. This transparency cuts through the noise of alerts, transforming raw data into actionable insights. For organizations facing the challenge of maximizing efficiency with smaller teams and limited budgets, Graylog is essential as it provides comprehensive visibility, accelerates investigations, and offers predictable pricing—delivering SIEM without compromise.

Log360 is a comprehensive security information and event management (SIEM) solution designed to address threats across on-premises, cloud, and hybrid environments. Additionally, it assists organizations in maintaining compliance with various regulations like PCI DSS, HIPAA, and GDPR. This adaptable solution can be tailored to fit specific organizational needs, ensuring the protection of sensitive information. With Log360, users have the ability to monitor and audit a wide range of activities across their Active Directory, network devices, employee workstations, file servers, databases, Microsoft 365, and various cloud services. The system effectively correlates log data from multiple sources to identify intricate attack patterns and persistent threats. It includes advanced behavioral analytics powered by machine learning, which identifies anomalies in user and entity behavior while providing associated risk scores. More than 1000 pre-defined, actionable reports present security analytics in a clear manner, facilitating informed decision-making. Moreover, log forensics can be conducted to delve deeper into the origins of security issues, enabling a thorough understanding of the challenges faced. The integrated incident management system further enhances the solution by automating remediation responses through smart workflows and seamless integration with widely used ticketing systems. This holistic approach ensures that organizations can respond to security incidents swiftly and effectively.

Manage Engine's EventLog Analyzer stands out as the most cost-effective security information and event management (SIEM) software in the market. This secure, cloud-based platform encompasses vital SIEM functionalities such as log analysis, log consolidation, user activity surveillance, and file integrity monitoring. Additional features include event correlation, forensic analysis of logs, and retention of log data. With its robust capabilities, real-time alerts can be generated, enhancing security response. By utilizing Manage Engine's EventLog Analyzer, users can effectively thwart data breaches, uncover the underlying causes of security challenges, and counteract complex cyber threats while ensuring compliance and maintaining a secure operational environment.

ADAudit Plus offers comprehensive insights into all activities within your Windows Server environment, ensuring both safety and compliance. This tool provides an organized perspective on modifications made to your Active Directory (AD) resources, encompassing AD objects, their attributes, group policies, and much more. By implementing AD auditing, you can identify and address insider threats, misuse of privileges, or other potential security breaches. It grants a thorough overview of all elements in AD, including users, computers, groups, organizational units, and group policy objects. You can monitor user management actions such as deletions, password resets, and changes in permissions, along with information detailing who performed these actions, what was done, when it happened, and where. To maintain a principle of least privilege, it's essential to track additions and removals from both security and distribution groups, enabling better oversight of user access rights. This ongoing vigilance not only helps in compliance but also fortifies the overall security posture of your server environment.

Maintaining vigilance by your side, advanced security analytics are now available for your whole organization. With a modernized approach to SIEM, you can identify and neutralize threats before they inflict any harm. Microsoft Sentinel provides an expansive overview of your entire enterprise landscape. Leverage the power of the cloud and extensive intelligence derived from years of Microsoft’s security knowledge to enhance your defenses. The integration of artificial intelligence (AI) will expedite your threat detection and response processes, making them more effective. This innovation significantly lowers both the time and expenses associated with establishing and managing security infrastructure. You can dynamically adjust your security requirements to align with your needs while simultaneously cutting IT expenses. Gather data at a vast scale across all users, devices, and applications, whether on-site or across various cloud environments. By utilizing Microsoft's unmatched threat intelligence and analytical capabilities, you'll be able to pinpoint known threats and minimize false alarms. With decades of experience in cybersecurity, Microsoft equips you to investigate threats and monitor suspicious activities on a wide scale, ensuring robust protection for your organization. This comprehensive approach empowers you to stay ahead of potential risks while simplifying your security management.

Splunk Enterprise is a data platform designed to give organizations total visibility into their operations, security, and infrastructure. It allows businesses to collect and analyze data from virtually any source, whether it’s logs, metrics, or streaming data, enabling proactive monitoring and response. Teams can build powerful dashboards, automate alerts, and track anomalies in real time, ensuring that threats and issues are identified before they disrupt operations. Powered by Splunk AI, the platform goes beyond reporting by predicting risks, uncovering hidden patterns, and enabling data-driven decisions. Splunk’s machine learning apps, such as the AI Assistant and Anomaly Detection toolkit, bring advanced intelligence to IT service management and security workflows. Its flexible architecture scales effortlessly, supporting terabytes of data and over 2,300 integrations with popular enterprise tools. Whether in security operations, IT infrastructure, or digital business monitoring, Splunk unifies data across edge, cloud, and hybrid ecosystems. Customers report dramatic efficiency gains, such as cutting incident workloads by nearly 99% and slashing costs with automation. This ability to connect insights across the enterprise makes Splunk an essential platform for digital resilience. By turning raw data into clear, actionable intelligence, Splunk empowers organizations to act with speed, clarity, and confidence.

DNIF provides an exceptionally beneficial solution by seamlessly combining SIEM, UEBA, and SOAR technologies into one comprehensive platform, all while keeping the total cost of ownership remarkably low. Its hyper-scalable data lake is designed for efficiently ingesting and storing extensive volumes of data, allowing users to detect suspicious behavior through advanced statistical analysis and enabling them to take proactive steps to avert potential threats. This platform facilitates the orchestration of processes, personnel, and technology from a centralized security dashboard, enhancing operational efficiency. Moreover, the SIEM is pre-loaded with essential dashboards, reports, and response workflows, delivering thorough support for activities such as threat hunting, compliance checks, user behavior monitoring, and identifying network traffic anomalies. The addition of a detailed coverage map that aligns with the MITRE ATT&CK and CAPEC frameworks significantly boosts its overall effectiveness. You can expand your logging capabilities without the worry of going over budget—potentially increasing your capacity two or even threefold within the same financial constraints. Thanks to HYPERCLOUD, the fear of overlooking critical information has become a thing of the past, as you can now log every relevant detail and ensure that nothing slips through the cracks, thereby strengthening your security posture. This comprehensive approach ensures that your organization's defenses are not only robust but also adaptable to evolving threats.

Logmanager is a centralized log management solution with integrated SIEM features that radically simplifies responses to cyberthreats, legal compliance, and troubleshooting. It turns logs, metrics, and traces from across your infrastructure into actionable insights, empowering security and operations teams to respond faster and more effectively. Experience effortless self-management and customization, peerless functionality, and the flexibility to take control of your entire technology stack. – Seamlessly collect and normalize logs from various sources into a single platform. – Benefit from fast deployment, 140+ out-of-the-box integrations, and effortless scalability. – Monitor security events in real time to promptly detect, investigate, and respond to potential threats. – Choose from dozens of predefined security dashboards or customize your own views. – Quickly query and filter log data by host, device, or any other tag. – Set up alerts based on multiple trigger conditions or custom-defined rules. – Transparent pricing with no hidden fees. Pay as you go, scale as you grow.

Hybrid SIEM solutions integrate real-time log tracking along with thorough system and network surveillance, granting users an all-encompassing perspective of their servers, endpoints, and networks. The normalization and correlation engine for security event logs, accompanied by informative email alerts, enhances context, turning complex Windows security events into straightforward reports that reveal insights beyond mere raw data. Furthermore, EventSentry’s NetFlow feature visualizes network traffic, enabling the detection of potentially harmful activities while also shedding light on bandwidth consumption. The ADMonitor component from EventSentry simplifies the monitoring of Active Directory modifications, capturing all alterations to Group Policy objects and compiling a comprehensive user inventory to help in pinpointing obsolete accounts. Additionally, the solution offers a wide array of integrations and options for multi-tenancy, making it adaptable to various organizational needs. This flexibility allows businesses to tailor their security monitoring to fit their specific requirements effectively.

Engineers have a deep affection for open-source solutions. We enhanced leading open-source monitoring tools like Jaeger, Prometheus, and ELK, merging them into a robust and scalable SaaS platform. This allows you to gather and analyze all your logs, metrics, traces, and additional data in a single location for comprehensive monitoring. With our user-friendly and customizable dashboards, you can easily visualize your data. Logz.io employs an AI/ML human-coach that automatically identifies and rectifies errors or exceptions in your logs. Our system can alert you via Slack, PagerDuty, Gmail, and other channels, ensuring you can swiftly address new incidents. You can centralize your metrics at any level through our Prometheus-as-a-service offering. By unifying logs and traces, we simplify the monitoring process. Getting started is easy—just add three lines of code to your Prometheus configuration file to initiate the forwarding of your metrics and data to Logz.io, streamlining your monitoring experience even further. This integration ultimately enhances your operational efficiency and response times.

SOC Prime provides security teams with a comprehensive and powerful platform for collaborative cyber defense, fostering teamwork among a worldwide cybersecurity community while offering the latest Sigma rules that are compatible with more than 28 SIEM, EDR, and XDR platforms. By utilizing a zero-trust framework and innovative technology derived from Sigma and MITRE ATT&CK®️, SOC Prime facilitates intelligent data orchestration, economically efficient threat hunting, and adaptive attack surface visibility, thereby enhancing the return on investment for SIEM, EDR, XDR, and Data Lake solutions while improving detection engineering productivity. The company’s groundbreaking advancements have garnered recognition from independent research firms, endorsements from top SIEM, XDR, and MDR vendors, and the trust of over 8,000 organizations across 155 countries, including notable percentages of Fortune 100 companies, Forbes Global 2000 firms, public sector institutions, and numerous MSSP and MDR providers. Supported by notable investors such as DNX Ventures, Streamlined Ventures, and Rembrandt Venture Partners, SOC Prime successfully raised $11.5 million in funding in October 2021. Through its cutting-edge cybersecurity offerings, including the Threat Detection Marketplace, Uncoder AI, and Attack Detective, SOC Prime empowers organizations to enhance their cybersecurity strategies and effectively manage risk. This commitment to innovation and collaboration positions SOC Prime as a leader in the evolving landscape of cybersecurity.

A centralized management dashboard offers an all-encompassing view of the organization, allowing for enhanced oversight and control. All components within the technology framework are interconnected with a central database, which improves operational efficiency for tasks such as monitoring, investigations, and incident response. This system utilizes both active and passive vulnerability scanners to identify potential issues early on, complemented by pre-configured reports that aid in compliance assessments. Users have the capability to monitor and manage account access and permission changes, reinforcing security protocols. Alerts are triggered for any unusual activities, enabling swift action when necessary. In addition, the dashboard supports remote management capabilities, which allows for quick responses to possible cyber threats. It also features monitoring tools for changes to sensitive data access, ensuring the protection of classified information. To further enhance security, advanced threat protection is implemented to defend endpoints and servers against new and evolving threats, thereby strengthening the overall security framework of the organization. This cohesive strategy not only simplifies operations but also significantly boosts the organization's responsiveness to risks, creating a more resilient infrastructure. Furthermore, the integration of these systems fosters better collaboration among teams, facilitating a proactive approach to cybersecurity challenges.

Elevate your cybersecurity strategy with Zercurity, which streamlines the management and oversight of your organization's security efforts, thus reducing the time and resources spent on these crucial tasks. Gain access to actionable insights that offer a comprehensive view of your current IT landscape, alongside automatic evaluations of your assets, applications, packages, and devices. Our sophisticated algorithms perform extensive queries throughout your resources, swiftly detecting any anomalies or vulnerabilities as they emerge. Protect your organization by uncovering potential threats and effectively addressing the associated risks. With built-in reporting and auditing capabilities, the remediation process becomes much more efficient and straightforward. Experience an all-encompassing security monitoring system that encompasses every facet of your organization, allowing you to query your infrastructure with the ease of accessing a database. Receive quick answers to your most pressing questions while continually assessing your risk exposure in real-time. Move beyond mere speculation about where your cybersecurity weaknesses might lie and attain deep insights into every dimension of your organization’s security environment. Zercurity not only equips you to stay ahead of potential threats but also ensures that your defenses remain vigilant at all times, providing you with peace of mind. With Zercurity, you can transform your approach to cybersecurity, making it proactive rather than reactive.

We took a fresh look at all the foundational concepts of SIEM and rebuilt the system entirely from the ground up. This effort has resulted in a more efficient security data platform that is faster, more economical, and delivers improved precision in detecting threats. As cybercriminals increasingly resort to simple techniques for breaching systems—often by hijacking legitimate user accounts to facilitate lateral movement—recognizing these intrusions has become a significant hurdle, even for expert security teams. RunReveal consolidates your log data, filters out irrelevant noise, and emphasizes the essential activities taking place within your infrastructure. Whether you're managing vast amounts of data measured in petabytes or smaller volumes in gigabytes, RunReveal excels in correlating threats across multiple log sources, offering you high-quality alerts straight away. We have dedicated resources to fortifying our security protocols, laying a strong groundwork for our security efforts. Our core belief is that by enhancing our security infrastructure, we not only safeguard ourselves but also gain deeper insights into our customers' requirements. This philosophy empowers us to stay ahead of potential threats while continuously refining our services to better meet the needs of those we aim to protect. As a result, we are committed to fostering innovation that anticipates emerging challenges in cybersecurity.

The top SIEM solution provides significant visibility, improves detection precision through contextual understanding, and enhances operational efficiency. This exceptional level of visibility is made possible by effectively consolidating, normalizing, and analyzing vast amounts of data from various sources, all facilitated by Splunk's powerful, data-centric platform that incorporates advanced AI capabilities. Utilizing risk-based alerting (RBA) — a standout feature of Splunk Enterprise Security — organizations can dramatically reduce alert volumes by up to 90%, enabling them to concentrate on the most pressing threats. This functionality not only boosts productivity but also guarantees that the monitored threats are of high credibility. Additionally, the seamless integration of Splunk SOAR automation playbooks with the case management functionalities of Splunk Enterprise Security and Mission Control fosters a unified working environment. By enhancing the mean time to detect (MTTD) and mean time to respond (MTTR) for incidents, teams can significantly improve their overall incident management efficiency. This holistic strategy ultimately cultivates a proactive security stance capable of adapting to changing threats, ensuring that organizations remain one step ahead in their defense. As a result, they can confidently navigate the complex landscape of cybersecurity challenges that lie ahead.

Elevate your security framework with LevelBlue USM Anywhere, an innovative open XDR platform designed to evolve alongside the complexities of your IT landscape and the growing requirements of your organization. Equipped with sophisticated analytics, extensive security orchestration, and automation features, USM Anywhere offers integrated threat intelligence that enhances and accelerates threat detection while streamlining response management. Its exceptional adaptability is showcased through a diverse range of integrations, referred to as BlueApps, which enhance its detection and orchestration functions across a multitude of third-party security and productivity tools. Moreover, these integrations enable the seamless activation of automated and orchestrated responses, thereby optimizing security management processes. Experience the capabilities of this transformative platform with a 14-day free trial, allowing you to explore how it can revolutionize your cybersecurity strategy and empower you to proactively counter potential threats in today's rapidly evolving digital landscape. Don't miss the opportunity to strengthen your defenses and ensure a more secure future for your enterprise.

M365 Manager Plus serves as an all-inclusive tool for managing Microsoft 365, allowing users to report, oversee, monitor, audit, and set alerts for essential activities. It streamlines the management of services like Exchange Online, OneDrive for Business, and Skype for Business from a single interface. This software provides a vast array of pre-configured reports tailored for Microsoft 365, facilitating intricate tasks such as bulk user and mailbox management, secure delegation, and mail handling. With 24/7 monitoring capabilities, it ensures users are promptly informed via email notifications regarding any service disruptions. Additionally, M365 Manager Plus enhances compliance management through its built-in compliance reports. Furthermore, it boasts advanced features for auditing, alerting, and reporting, which are crucial for maintaining the security of your Microsoft 365 environment, ultimately making it an indispensable resource for administrators.

Altoverra is here to transform your digital environment for the better. We simplify the process for you. With our Managed SIEM, we integrate cybersecurity measures that effectively thwart potential threats, allowing your business to run effortlessly. In this way, we provide peace of mind as you focus on your core operations.