> ## Documentation Index
> Fetch the complete documentation index at: https://www.checklyhq.com/docs/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.

![Light mode interface](https://mintcdn.com/checkly-422f444a/9etsKFvWZACwJz7j/images/next/home-dash-light-2x.png?fit=max\&auto=format\&n=9etsKFvWZACwJz7j\&q=85\&s=137ac06a9adc296c3a1efe014bf255be)

Checkly is an Application Reliability platform that enables teams to **test, monitor, and observe** their web applications, APIs, and other services using a developer or agentic workflow. Built for modern teams, Checkly uses combines a UI, [APIs](https://www.checklyhq.com/docs/api-reference/overview.md), and a [CLI](https://www.checklyhq.com/docs/cli/overview.md) to help define your monitoring setup autonomously and integrate directly into CI/CD pipelines.

### Improving reliability and stability with Checkly:

Checkly has three core capabilities:

* **Detect**: Testing, Uptime Monitoring, and Synthetic Monitoring with Playwright.
* **Communicate**: Customizable Alerting, Dashboards, & Status Pages for clear communication.
* **Resolve**: Distributed full-stack tracing and AI-powered incident analysis and context.

## 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.

> **[Monitoring as Code](https://www.checklyhq.com/docs/concepts/monitoring-as-code.md)**
>
> Define your entire monitoring setup with TypeScript constructs instead of manual UI configuration.

> **[Native Playwright Support](https://www.checklyhq.com/docs/detect/synthetic-monitoring/browser-checks/overview.md)**
>
> Browser monitoring powered natively by Playwright for fast, reliable end-to-end scenario monitoring.

> **[Developer-First Experience](https://www.checklyhq.com/docs/cli/authentication.md)**
>
> Code-driven platform with constructs, APIs, and a CLI that manages the entire lifecycle of your monitors.

> **[Unified Testing, Monitoring, Tracing, and Incident Management](https://www.checklyhq.com/docs/detect/testing/overview.md)**
>
> Unify testing, monitoring, and observability into a single workflow using Playwright and OpenTelemetry.

> **[Reliable Error Detection](https://www.checklyhq.com/docs/concepts/results.md)**
>
> Detect both functional and performance errors in pre-production and production environments.

## Use Cases

* **[Run checks on every deploy](https://www.checklyhq.com/docs/guides/sdlc-monitoring.md)** — Validate functionality and performance in staging before deployment, catching regressions early.
* **[Production Monitoring](https://www.checklyhq.com/docs/learn/monitoring/api-monitoring.md)** — Continuously monitor critical user journeys, API endpoints, and application performance.
* **[Monitor a checkout flow](https://www.checklyhq.com/docs/guides/monitoring-ecommerce-apps-using-playwright.md)** — Monitor checkout flows, payment processing, and product catalog to prevent revenue loss.
* **[API Reliability](https://www.checklyhq.com/docs/learn/monitoring/api-monitoring.md)** — Ensure third-party integrations and internal APIs maintain expected response times and availability.
* **[Multi-Environment Validation](https://www.checklyhq.com/docs/concepts/environments.md)** — Test across different environments, browsers, and devices for consistent functionality.
* **[Compliance and SLA Monitoring](https://www.checklyhq.com/docs/learn/incidents/slo-sla-sli.md)** — Track uptime and performance metrics to meet SLAs and regulatory requirements.

## 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.


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