> ## Documentation Index
> Fetch the complete documentation index at: https://checkly-422f444a-mda-troubleshooting-section.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# What is Checkly?

> The Application Reliability Platform built for modern engineering teams.

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Checkly is a Application Reliability platform that enables teams to **test, monitor, and observe** their web applications, APIs, and other services in a unified workflow. Built for modern development teams, Checkly uses [Monitoring as Code](/guides/getting-started-with-monitoring-as-code) to help define your monitoring setup in code and integrate directly into CI/CD pipelines. Rely on a single workflow to define your monitoring in code, automatically test it in preview environments and deploy with your production code.

**The platform combines three core reliability capabilities:**

<Columns cols={3}>
  <Card title="Detect" href="/detect/overview" icon="radar">
    Testing, Uptime Monitoring, and Synthetic Monitoring with Playwright.
  </Card>

  <Card title="Communicate" href="/communicate/overview" icon="bell">
    Customizable Alerting, Dashboards, & Status Pages for clear communication.
  </Card>

  <Card title="Resolve" href="/resolve/overview" icon="brain">
    Distributed full-stack tracing and AI-powered incident analysis and context.
  </Card>
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## Why Checkly?

Checkly helps developers increase uptime and reliability, improve shipping velocity, and improve incident response time through a unified workflow that's scalable, automated, and AI-ready. Teams most often choose Checkly for:

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  <Card title="Monitoring as Code" href="/concepts/monitoring-as-code" cta="Learn more" horizontal>
    Instead of monitoring being configured through a bulky, limited UI that is slow to keep up with the pace of development, Checkly enables engineers to build and configure their entire monitoring process with Typescript constructs.
  </Card>

  <Card title="Native end-to-end reliability with Playwright" href="/detect/synthetic-monitoring/browser-checks/overview" cta="Learn more" horizontal>
    Checkly's browser monitoring is powered natively by Playwright, the world's most popular open-source testing framework. It's fast, robust, reliable, and enables engineers to easily build tests that can monitor fully replicated end-to-end scenarios.
  </Card>

  <Card title="Delightful Developer Experience" href="/cli/authentication" cta="Learn more" horizontal>
    Checkly is a code-driven platform with all the constructs, APIs, and integrations that your engineering team needs to automate & program their entire observability process. The Checkly CLI manages the entire lifecycle of your monitors.
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  <Card title="Unified Testing, Monitoring, Tracing, and Incident Management" href="/detect/testing/overview" cta="Learn more" horizontal>
    Checkly proactively improves application reliability by unifying testing, monitoring, and observability into a single workflow using technologies like Playwright and Open Telemetry.
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  <Card title="Reliable Functional and Performance Error Detection" href="/concepts/results" cta="Learn more" horizontal>
    Checkly accurately detects both **functional** and **performance errors** in pre-production and production environments. This helps consolidate tooling and improving the velocity of teams shipping quality features and services.
  </Card>
</Columns>

## Use Cases

<Accordion title="Pre-Production Testing">
  Validate application functionality and performance in staging environments before deployment, catching regressions early in the development cycle.

  [Learn more](/guides/sdlc-monitoring)
</Accordion>

<Accordion title="Production Monitoring">
  Continuously monitor critical user journeys, API endpoints, and application performance to ensure optimal user experience.

  [Learn more](/learn/monitoring/api-monitoring)
</Accordion>

<Accordion title="Transaction Monitoring">
  Monitor checkout flows, payment processing, and product catalog functionality to prevent revenue loss from broken user paths.

  [Learn more](/guides/monitoring-ecommerce-apps-using-playwright)
</Accordion>

<Accordion title="API Reliability">
  Ensure third-party integrations and internal APIs maintain expected response times and availability through automated testing.

  [Learn more](/learn/monitoring/api-monitoring)
</Accordion>

<Accordion title="Multi-Environment Validation">
  Test applications across different environments, browsers, and devices to ensure consistent functionality and performance.

  [Learn more](/concepts/environments)
</Accordion>

<Accordion title="Compliance and SLA Monitoring">
  Track uptime and performance metrics to meet service level agreements and regulatory compliance requirements.

  [Learn more](/learn/incidents/slo-sla-sli)
</Accordion>

## Checkly Is Best Fit For

**DevOps and SRE Teams** looking for programmable monitoring that integrates seamlessly with their existing infrastructure-as-code and GitOps workflows.

**Full-Stack Engineering Teams** who want to shift monitoring left and treat monitoring as an integral part of their development process rather than an afterthought.

**Engineering Teams Using Modern Web Technologies** who want monitoring that understands modern JavaScript frameworks, SPAs, and API-first architectures.