List of the Top 15 API Security Software for Linux in 2025

SKUDONET offers IT executives an affordable solution that emphasizes ease of use and adaptability, ensuring optimal performance and security for IT services. With this innovative platform, you can seamlessly improve the security and reliability of your applications through an open-source ADC, allowing for significant cost savings and unparalleled flexibility within your IT framework. This approach not only streamlines operations but also empowers organizations to respond swiftly to changing technology needs.

Designed for optimal performance and effective resource management, KrakenD is capable of handling an impressive 70,000 requests per second with just a single instance. Its stateless architecture promotes effortless scalability, eliminating the challenges associated with database maintenance or node synchronization. When it comes to features, KrakenD excels as a versatile solution. It supports a variety of protocols and API specifications, providing detailed access control, data transformation, and caching options. An exceptional aspect of its functionality is the Backend For Frontend pattern, which harmonizes multiple API requests into a unified response, thereby enhancing the client experience. On the security side, KrakenD adheres to OWASP standards and is agnostic to data types, facilitating compliance with various regulations. Its user-friendly nature is bolstered by a declarative configuration and seamless integration with third-party tools. Furthermore, with its community-driven open-source edition and clear pricing structure, KrakenD stands out as the preferred API Gateway for enterprises that prioritize both performance and scalability without compromise, making it a vital asset in today's digital landscape.

Tyk is a prominent Open Source API Gateway and Management Platform, recognized for its leadership in the realm of Open Source solutions. It encompasses a range of components, including an API gateway, an analytics portal, a dashboard, and a dedicated developer portal. With support for protocols such as REST, GraphQL, TCP, and gRPC, Tyk empowers numerous forward-thinking organizations, processing billions of transactions seamlessly. Additionally, Tyk offers flexible deployment options, allowing users to choose between self-managed on-premises installations, hybrid setups, or a fully SaaS solution to best meet their needs. This versatility makes Tyk an appealing choice for diverse operational environments.

Graylog Security, built on the robust Graylog Platform, stands out as a premier solution for threat detection, investigation, and response (TDIR), designed to enhance cybersecurity operations through a user-friendly workflow, an efficient analyst experience, and cost-effectiveness. This solution aids security teams in minimizing risks and boosting essential metrics such as Mean Time to Detect (MTTD) by refining threat detection capabilities while simultaneously decreasing Total Cost of Ownership (TCO) thanks to its inherent data routing and tiering features. Moreover, Graylog Security speeds up incident response times by allowing analysts to swiftly tackle urgent alerts, effectively lowering Mean Time to Response (MTTR). With its integrated SOAR capabilities, Graylog Security not only automates tedious tasks and streamlines workflows but also significantly improves response efficiency, thereby enabling organizations to proactively identify and mitigate cybersecurity threats. This comprehensive approach makes Graylog Security a vital asset for any organization looking to strengthen its cybersecurity posture.

Ambassador Edge Stack serves as a Kubernetes-native API Gateway that delivers ease of use, robust security, and the capability to scale for extensive Kubernetes environments globally. It simplifies the process of securing microservices by offering a comprehensive suite of security features, which encompass automatic TLS, authentication, and rate limiting, along with optional WAF integration. Additionally, it facilitates fine-grained access control, allowing for precise management of user permissions. This API Gateway functions as an ingress controller based on Kubernetes, and it accommodates an extensive array of protocols, such as gRPC, gRPC Web, and TLS termination, while also providing traffic management controls that help maintain resource availability and optimize performance. Overall, Ambassador Edge Stack is designed to meet the complex needs of modern cloud-native applications.

Enhance the security of your APIs by conducting thorough analyses and safeguarding them through passive, inline, or API-driven integration with various network elements, including API gateways, proxies, or CDNs. Utilizing predefined policies that have been meticulously adjusted according to prevalent threat patterns, which have effectively safeguarded billions of API transactions daily, ensures unparalleled defense. A robust API-centric architecture paired with a comprehensive user interface facilitates seamless integration with threat intelligence feeds and additional security measures. Moreover, a patented machine learning-based analysis method mitigates the drawbacks of JavaScript integration, such as slow page loading times, prolonged development cycles, and the necessity for mobile app updates. This ML-driven approach creates a distinctive Behavioral Footprint that helps in recognizing harmful intentions while consistently monitoring attackers as they adapt their strategies, reinforcing the overall security framework. With these advanced technologies at your disposal, organizations can significantly bolster their API security posture against evolving threats.

You have the option to utilize your preferred debugging software to address issues with your Kubernetes services on a local level. Telepresence, an open-source solution, facilitates the execution of a single service locally while maintaining a connection to a remote Kubernetes cluster. Originally created by Ambassador Labs, known for their open-source development tools like Ambassador and Forge, Telepresence encourages community participation through issue submissions, pull requests, and bug reporting. Engaging in our vibrant Slack community is a great way to ask questions or explore available paid support options. The development of Telepresence is ongoing, and by registering, you can stay informed about updates and announcements. This tool enables you to debug locally without the delays associated with building, pushing, or deploying containers. Additionally, it allows users to leverage their preferred local tools such as debuggers and integrated development environments (IDEs), while also supporting the execution of large-scale applications that may not be feasible to run locally. Furthermore, the ability to connect a local environment to a remote cluster significantly enhances the debugging process and overall development workflow.

Gravitee.io stands out as an exceptionally affordable and high-performing Open Source API Platform that empowers organizations to securely publish, analyze, and protect their APIs. With its certified OAuth2 OpenID Connect (OIDC) and Financial-grade API (FAPI) servers, Gravitee.io enables effective identity management. The platform's API management features allow for precise control over who can access your APIs, as well as the timing and manner of that access. Its lightweight design, combined with flexibility and impressive speed, makes it an ideal choice for developers. Gravitee.io also offers comprehensive tools for managing, monitoring, deploying, and securing APIs, complemented by robust governance features such as API reviews and quality assessments. Additionally, the Gravitee.io portal enhances the engagement experience for API consumers, fostering meaningful interactions and ensuring that organizations thrive in the digital landscape. By leveraging Gravitee.io, businesses can significantly elevate their API strategy and achieve superior operational efficiency.

Resurface serves as a specialized tool for runtime API security, enabling continuous scanning that facilitates immediate detection and response to potential threats and vulnerabilities. Designed specifically for API data, it captures every request and response payload, including those from GraphQL, allowing users to quickly identify possible risks and failures. With its real-time alert system, Resurface notifies users about data breaches, providing zero-day detection capabilities. Additionally, it aligns with the OWASP Top 10, offering alerts on various threats while employing comprehensive security patterns. As a self-hosted solution, it ensures that all data remains first-party and secure. Unique in its capabilities, Resurface can conduct extensive inspections at scale, efficiently detecting active attacks as it processes millions of API calls. Leveraging advanced machine learning models, it identifies unusual patterns and recognizes low-and-slow attack strategies, enhancing overall API security measures. This combination of features makes Resurface a crucial tool for any organization serious about safeguarding their APIs and mitigating risks.

Pynt is a cutting-edge API Security Testing Platform that unveils authenticated API vulnerabilities through simulated attacks. We assist numerous organizations, such as Telefonica, Sage, and Halodoc, in consistently monitoring, classifying, and preemptively addressing inadequately secured APIs before malicious hackers can exploit them. Leveraging a distinctive hacking methodology and an integrated shift-left approach, Pynt employs proprietary attack scenarios to identify genuine threats. In addition, it facilitates the discovery of APIs and provides recommendations for rectifying confirmed vulnerabilities. With the trust of thousands of businesses, Pynt plays a crucial role in safeguarding their applications. Many companies incorporate Pynt into their application security strategies to ensure robust protection against potential threats. This reliance on Pynt underscores its importance in the ever-evolving landscape of API security.

Utilihive is a cloud-native platform for big data integration, provided as a managed service in the Software as a Service (SaaS) model. Renowned as the leading Enterprise Integration Platform as a Service (iPaaS), Utilihive is tailored specifically for applications within the utility and energy sectors. The platform not only supplies the essential technical components such as connectivity, integration, data ingestion, and management of data lakes but also includes ready-to-use integration content like connectors, data flows, orchestrations, and a utility data model. Furthermore, it offers energy services along with monitoring and reporting dashboards, facilitating rapid deployment of data-centric services while streamlining operational processes for users. By leveraging these features, organizations can achieve greater efficiency and responsiveness in managing their energy and utility data needs.

Authress provides an efficient Authorization API tailored for your application, as managing authorization can become intricate very quickly. While it may appear straightforward at first glance, numerous underlying complexities can arise, making it an undertaking best not approached alone. Achieving effective authorization is a time-consuming task, with straightforward implementations averaging around 840 hours, and this duration increases significantly with the addition of more features to your application. Your application holds the potential to be your most significant security risk; without proper expertise, it can become vulnerable to malicious threats. Failing to implement robust authorization exposes you to the dangers of user data breaches, regulatory non-compliance, and substantial financial repercussions. Authress offers a secure authorization API, allowing you to avoid the pitfalls of developing your own authorization framework by simply leveraging our comprehensive solution. Designed by developers for developers, it features granular permissions that let you establish multiple levels of access organized by user role, allowing for precise control. Additionally, with seamless identity provider integrations, connecting to any ID provider is as simple as making an API call, ensuring smooth and secure user authentication. This way, you can focus on enhancing your application while leaving the complexities of authorization to us.

Spherical Defense offers a cutting-edge API security solution that utilizes advanced deep unsupervised learning methods to protect your APIs efficiently. The Express version of Spherical Defense is tailored for AWS deployment and can be set up in under a minute, initiating its defense mechanisms within a two-hour timeframe at a cost-effective rate of just $1 per hour. Once your Spherical instance is operational, it immediately begins to analyze API traffic and continues this process until it accumulates sufficient data for its initial model training. After processing roughly 16,000 requests, the system enters a training phase, refining its security model over a span of approximately six hours, followed by a thorough evaluation. As the system consistently receives incoming data, it remains agile, training additional models to adapt to evolving API traffic patterns. This continual process of training and adjustment ensures that the solution maintains robust protection, rendering it a versatile and proactive safeguard for your APIs. Ultimately, following the assessment of the trained security model, the system enhances its capability to combat future threats with greater efficacy. This adaptability not only fortifies security but also builds trust in the integrity of your API operations.

Open-appsec is an innovative open-source project that leverages machine learning to deliver proactive security measures for web applications and APIs, safeguarding against the OWASP Top 10 vulnerabilities as well as zero-day exploits. This system can be seamlessly integrated as an add-on to Kubernetes Ingress, NGINX, Envoy, and various API Gateways. The core engine of open-appsec observes typical user interactions with your web application, utilizing this behavior data to identify any requests that deviate from established norms, subsequently forwarding these anomalies for further scrutiny to determine their potential maliciousness. To achieve this, open-appsec employs two distinct machine learning models: 1. A supervised model developed offline, drawing insights from millions of both malicious and harmless requests. 2. An unsupervised model that evolves in real time within the protected environment, focusing on the unique traffic patterns of that specific setting. In addition to its robust detection capabilities, open-appsec streamlines maintenance by eliminating the need for frequent threat signature updates and exception management, which are often prerequisites in many conventional WAF solutions. Overall, open-appsec not only enhances security but also reduces the complexity typically associated with managing web application firewalls.

Managing application delivery at scale presents various challenges, yet NetScaler streamlines this task effectively. Whether your operations are entirely on-premises, completely cloud-based, or situated in a hybrid model, NetScaler ensures seamless functionality across all environments. Built on a unified code base, its architecture guarantees that performance remains consistent, whether utilizing hardware, virtual machines, bare metal, or containers. Regardless of whether your user base includes hundreds of millions of customers or just hundreds of thousands of employees, NetScaler promises dependable and secure application delivery. Recognized as the leading application delivery and security solution among the world's largest enterprises, NetScaler is relied upon by thousands of organizations, with over 90 percent of the Fortune 500 counting on it to provide high-performance application services, strong application and API security, and exhaustive visibility into all operations. This extensive reliance highlights NetScaler's crucial importance in the contemporary digital landscape, emphasizing its role in not just meeting but exceeding user expectations.