Checkly: Application Monitoring Powered by Playwright & OTEL

# Checkly > Checkly is the synthetic monitoring and testing platform for modern engineering teams. Test and monitor your APIs and web apps from pull request to production — from the outside in. Checkly helps engineering teams build reliable, performant applications by proactively detecting issues before users do. Unlike traditional monitoring that only tells you when servers are down, Checkly validates that customer-facing workflows actually work. ## Platform The Checkly Platform is made up of three products that work together: from pull-request to post-mortem. - **Checkly Detect**: Test and monitor applications, services, and infrastructure with uptime monitoring, synthetic monitoring powered by Playwright, and continuous testing across staging, CI/CD, and production. - **Checkly Communicate**: Notify and inform stakeholders about incidents with rich alerting (Slack, PagerDuty, SMS), branded status pages, and real-time dashboards. - **Checkly Resolve**: Investigate and resolve incidents faster with OpenTelemetry-based distributed tracing and Rocky AI for AI-powered incident investigation. ## Differentiators - **Signal Over Noise**: Proactive, outside-in monitoring that delivers actionable signal instead of data overload. Catch user-impacting issues before users do. - **Monitoring as Code**: Define, version, and manage monitoring as code with CLI, Terraform, and Pulumi providers. No agents required. - **Developer Experience**: A developer-first platform with CLI, API, and SDK. Engineers define, test, and deploy monitors without leaving Git. - **Native Playwright Support**: Built natively on Playwright. Reuse the same test scripts from CI for production monitoring. - **Unified Platform**: Combines synthetic monitoring, distributed tracing, and incident response in a single platform. ## Products - [Synthetic Monitoring](https://www.checklyhq.com/product/synthetic-monitoring/): Validate real user journeys with full Chromium browser checks powered by Playwrig