Checkly

Checkly is a developer-first synthetic monitoring and reliability platform that lets engineering teams define uptime, API, and browser checks as version-controlled code. Built on Microsoft's Playwright framework and OpenTelemetry, it runs checks from 20+ global locations and layers in AI-driven root cause analysis. Founded in 2018 and headquartered with roots in Berlin, Checkly serves 1,000+ customers - including Vercel, 1Password, CrowdStrike, and Mistral - and has raised $32.25M, most recently a $20M Series B led by Balderton Capital in 2024.