Checkly: Application Monitoring Powered by Playwright & OTEL

Checkly is an AI-powered application monitoring platform that unifies synthetic monitoring, uptime checks, and observability for modern engineering teams using Playwright and OpenTelemetry.

🚀 Overview

Checkly is a synthetic monitoring platform designed to ensure application reliability by proactively detecting issues in web apps, APIs, and user flows before they impact customers. It combines uptime monitoring, browser-based synthetic checks powered by Playwright, API monitoring, and OpenTelemetry tracing into a single code-first workflow.

The platform solves the problem of fragmented monitoring tools that don't integrate well with developer workflows, leading to slow issue detection and resolution. By enabling 'Monitoring as Code', teams can define, test, and deploy monitors using familiar tools like JavaScript/TypeScript, Terraform, or Pulumi directly from their repositories.

It's built for engineering teams, developers, and DevOps professionals managing production web applications across test, staging, and live environments. Checkly was created to reimagine monitoring as a developer-native experience with AI assistance for root cause analysis, reducing mean time to resolution (MTTR) in fast-paced CI/CD pipelines.

✨ Key Features

Synthetic browser monitoring with Playwright to validate end-to-end user journeys and catch frontend issues early (enables reuse of E2E tests as production monitors)
Uptime checks for URLs, TCP, DNS; API checks with assertions, retries, and scripting (comprehensive backend validation)
AI-powered root cause analysis via Rocky AI and global monitoring from 20+ locations for accurate performance insights
Alerting integrations (Slack, PagerDuty, webhooks), status pages, maintenance windows, and OpenTelemetry tracing
Optional: Check Suites for parallel test runs, advanced scheduling

🛠 Tech Stack

Frontend: Vue.js
Backend: Node.js, TypeScript
Database: PostgreSQL, ClickHouse
Auth: Custom
Hosting: AWS

👥 Who Is This For?

This project is useful for:

Developers who want to implement monitoring as code in their Git repos
Engineering teams looking for unified synthetic monitoring and alerting
DevOps and indie makers building reliable web apps with CI/CD

📸 Screenshots / Demo

Live demo: https://app.checklyhq.com/signup
GitHub: https://github.com/checkly

🔥 Project Status

🟢 Actively building

Last updated: 2026-03-24

❓ FAQ

Is this project free?

Free trial available; Paid / Freemium with plans starting at $24/month (Starter) for production use. (Explain briefly.)

Is the source code available?

Partially — CLI and providers are open source: https://github.com/checkly/checkly-cli (The core platform is proprietary SaaS.)

Can I contribute?

Yes — contribute to the open-source CLI via GitHub issues and PRs (see CONTRIBUTING.md); provide feedback via public roadmap (https://feedback.checklyhq.com) or Slack community (https://www.checklyhq.com/slack/).