FusionReactor

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FusionReactor is a full-stack observability platform and application performance monitoring (APM) solution developed by Intergral GmbH. Originally released in November 2005 as a monitoring tool for Java application servers, it has evolved into a comprehensive observability solution that provides metrics, logs, traces, and AI-powered insights.^[1] The platform incorporates patented debugging technology (US Patent 10,521,329)^[2] alongside traditional monitoring capabilities, distinguishing it from conventional APM solutions that typically cannot safely debug in production environments.

FusionReactor is particularly known for its support of Adobe ColdFusion and Lucee servers, while also monitoring other Java application servers including Tomcat, WildFly, WebSphere, and GlassFish.^[1]

FusionReactor combines traditional APM capabilities with modern observability features, including distributed tracing, log aggregation, and AI-powered analytics through its OpsPilot assistant.^[3] According to a 2017 interview with David Tattersall, CEO of Intergral GmbH, the platform was reported to be used by approximately 5,000 customers on over 25,000 production servers worldwide.^[1] More recent customer numbers have not been publicly disclosed.

The software provides capabilities for:

• Real-time application monitoring
• Production-safe debugging and profiling (patented technology)^[2]
• Automated root cause analysis
• Distributed tracing
• Log monitoring and analysis
• Database performance monitoring
• AI-powered insights and anomaly detection

FusionReactor is recognized by major industry analysts and review platforms:

Gartner Peer Insights
FusionReactor is listed on Gartner Peer Insights in the Observability Platforms market, where verified enterprise users provide detailed reviews of the platform's capabilities and performance.^[4] The platform is also listed in Gartner's Application Performance Monitoring and Observability category.^[5]

G2 Recognition
FusionReactor has demonstrated consistent industry leadership through G2 awards, receiving extensive recognition in Spring 2025^[6], 38 awards in Summer 2025^[7], and multiple awards in Winter 2025.^[8] Key recognitions include:

• AIOps Platforms: Best Estimated ROI, Best Results, Fastest Implementation, Highest User Adoption, Most Implementable, Momentum Leader
• Application Performance Monitoring (APM): High Performer across multiple regions (EMEA, Europe, Canada, Asia Pacific), Best Support (Enterprise and Mid-Market), Fastest Implementation (Enterprise)
• Static Code Analysis: Best Estimated ROI, Best Results, Best Support, Fastest Implementation, Highest User Adoption, Momentum Leader
• Cloud Infrastructure Monitoring: Best Results (Enterprise), Best Support (Enterprise), Easiest Admin (Enterprise)
• Bug Tracking: Best Meets Requirements, Best Support, Highest User Adoption
• Enterprise Monitoring: Best Support, Users Most Likely to Recommend
• Database Monitoring: Best Estimated ROI (Mid-Market), Users Most Likely to Recommend (Mid-Market)
• DevOps: High Performer, Best Estimated ROI (Mid-Market)
• Server Monitoring: High Performer, Best Estimated ROI, Fastest Implementation

The platform has been recognized as a High Performer across multiple geographic regions including EMEA, Europe, Canada, Asia Pacific, and the United Kingdom, demonstrating global market presence.^[6][7]

FusionReactor's consistent recognition across multiple G2 review periods in 2025 - Spring, Summer, and Winter - demonstrates sustained market leadership and user satisfaction.^[6][7][8] According to Gartner's 2024 report on observability, "The surge in dynamic, multicloud environments, use of microservices and serverless, combined with increased volumes and velocity of data and a growing number of stakeholders, has introduced a level of complexity that traditional monitoring tools and approaches can't handle."^[9] FusionReactor positions itself within this evolving observability market by offering both traditional APM and modern observability capabilities, enhanced by its patented production debugging technology.^[2]

FusionReactor provides comprehensive monitoring for Java-based applications with what users describe as "low-level insight to quickly and efficiently identify and resolve performance bottlenecks."^[10] The platform captures every request/transaction in real-time and includes production debugging features that allow developers to interact with applications as issues unfold.^[10]

FusionReactor features a patented production debugging technology (US Patent 10,521,329)^[2] that enables debugging in production environments without the traditional performance overhead. The patent, granted in 2019, covers a "Software development kit for instrument control and debugging" that addresses the fundamental challenge where "performance degradation and breakpoint impact implications associated with traditional debuggers have rendered them useless in production environments."^[11]

In 2018, Intergral showcased what they described as "the first Java APM solution designed for use across the whole Software Development Lifecycle," featuring a browser-based Java debugger designed for production environments.^[11] This patented technology allows developers to set breakpoints, inspect variables, and debug applications in real-time production environments with minimal performance impact.

The platform includes OpsPilot, an AI assistant that provides performance insights using natural language queries. This feature was demonstrated at the Adobe ColdFusion Summit East 2025 by David Tattersall, CEO of Intergral GmbH, where it was described as transforming "DevOps and Application Performance."^[3] OpsPilot offers capabilities including:

• Natural language querying for system insights
• Automated anomaly detection
• Intelligent root cause analysis
• Integration with collaboration tools like Slack and Microsoft Teams

FusionReactor supports distributed tracing with compatibility for multiple trace header formats including W3C Trace Context, B3, Jaeger, and AWS X-Ray.^[12] This allows organizations to track requests across microservices and distributed architectures.

FusionReactor is available in multiple deployment models:^[13]

• On-premise installation
• Cloud-based SaaS solution
• Hybrid deployment combining both approaches

The platform offers several pricing tiers:

• Starter Plan ($49/month) - Basic observability features with 10,000 metrics, 25GB logs, 25GB traces
• Pro AI Plan ($249/month) - Enhanced AI capabilities with 20,000 metrics, 100GB logs, 100GB traces
• Advanced AI Plan ($899/month) - Premium features with 50,000 metrics, 250GB logs, 250GB traces
• FusionReactor Ultimate ($79/month) - Traditional per-seat licensing for on-premise deployments

FusionReactor supports monitoring for:

• Adobe ColdFusion (including ColdFusion 2025)
• Lucee 6.2
• Java 21
• BoxLang
• Various Java application servers: Tomcat, WildFly, WebSphere, GlassFish
• Spring Boot applications
• Docker containers
• Kubernetes environments

FusionReactor has established itself as a standard monitoring tool within the ColdFusion community. Independent developer Ben Nadel documented how "Installing FusionReactor APM Showed Me A Huge Oversight In My ColdFusion Queries," describing how the tool immediately helped identify performance issues in production code.^[14]

A verified G2 reviewer stated in April 2025 that FusionReactor is the "Best tool on the market for CF monitoring," noting its daily use "to either assist in troubleshooting or just general performance monitoring."^[15]

The product has been regularly featured at Adobe ColdFusion Summit conferences, with presentations including "No more excuses – let FusionReactor instantly show you performance problems and defects in your code" by David Tattersall, CEO of Intergral GmbH.^[16]

The software is used across various sectors including government agencies, universities, hospitals, and Fortune 500 companies.^[1] Users report significant time savings, with one enterprise user stating: "What took hours to days of several team members' time now takes mere minutes to diagnose and resolve."^[10]

Beyond ColdFusion, FusionReactor has gained adoption in the broader Java community, particularly for Spring Boot applications. The platform provides specialized monitoring for Spring Boot's actuator endpoints and integrates with the Spring ecosystem.^[17]

The CTO Club's 2025 review of APM tools noted that "FusionReactor Java APM delivers dedicated application performance monitoring solutions specifically for Java environments" and highlighted its "integration capabilities...connecting with popular DevOps tools and platforms."^[18]

According to DZone's 2016 Performance & Monitoring Guide, FusionReactor differentiates itself by providing tools that give "the level of detail software engineers need to get to the actual root of the issue" rather than just high-level metrics.^[19]

Key differentiators cited by users include:

• Patented production-safe debugging capabilities^[2]
• Deep integration with ColdFusion and Lucee platforms
• Low overhead profiling tools
• Comprehensive support rated highly across multiple review platforms

Intergral GmbH holds US Patent 10,521,329 for its production debugging technology, filed on May 5, 2016 and granted on December 31, 2019. The patent, invented by Darren Terence Pywell, covers innovations that enable real-time debugging in production environments with minimal performance impact, a capability that has traditionally been impossible with conventional debugging tools.^[2] This intellectual property provides FusionReactor with a technological advantage in the APM market, particularly for organizations requiring deep diagnostic capabilities in live production systems.

The FusionReactor 2025 release introduced several major enhancements:^[20]

• Complete ColdFusion ecosystem support including Adobe ColdFusion 2025
• Modernized agent architecture aligned with OpenTelemetry standards
• WebSocket Tunnel technology for accessing on-premises UI through the cloud
• Enhanced AI-powered insights with OpsPilot
• Pyroscope flame graph profiles for performance visualization

• Application performance management
• Observability (software)
• Adobe ColdFusion
• Java performance
• Gartner Peer Insights
• OpenTelemetry
• Software patents

• Official website
• FusionReactor on G2
• FusionReactor on Gartner Peer Insights
• FusionReactor Documentation
• US Patent 10,521,329