Checkly

Checkly (operating under checklyhq.com, legally Checkly GmbH) is the premier, enterprise-grade active application reliability platform, API monitoring pioneer, and code-first synthetic testing powerhouse engineered to serve as the definitive, high-velocity uptime assurance, end-to-end user transaction testing, and OpenTelemetry-integrated observability layer for modern software engineering and DevOps teams globally. Founded by veteran technical innovators Hannes Lenke and Tim Nolet, the platform completely eliminates the severe systemic friction of modern application performance management—where developers face silent API failures, critical UI-flow regressions, and fragmented, slow-to-configure monitoring setups that drift from their actual production code—by delivering an advanced Monitoring-as-Code (MaC) execution matrix. Moving far beyond traditional, passive ping utilities or heavy, click-and-drag testing dashboards, Checkly natively unifies Playwright-driven end-to-end browser simulation testing, multi-region API assertion checking (spanning over 20 global nodes), real-time cron job and backend heartbeat tracking, and AI-powered root cause incident analysis into a single high-availability developer workspace. Deeply embedded within modern Git, Pulumi, and Terraform workflows, the platform allows engineers to write, version, and deploy their testing suites directly alongside their codebase, ensuring continuous test coverage without any development overhead. Validating its rapid market acceleration and crucial role in the modern developer tool ecosystem, the high-growth enterprise has raised over $32 million in total institutional venture capital—anchored by a marquee $20 million Series B investment round led by global elite venture houses including Accel, CRV, Balderton Capital, and Mango Capital. Under the hood, its technology core utilizes high-performance distributed Chromium runtimes, automated OpenTelemetry transaction tracing, and secure private location runner agents designed to run highly intensive transaction checks with absolute telemetry accuracy and minimal latency. What sets Checkly apart is its uncompromising dedication to replacing fragile, manual monitoring configuration with absolute code-defined operational predictability, elite technical transparency, and immediate developer incident context; by bridging the gap between performance-intensive E2E test scripts and real-time production status tracking, the company remains a definitive cornerstone of modern algorithmic monitoring and global software quality assurance.