マエストロ

Maestro is an open-source UI testing framework designed to simplify and accelerate end-to-end testing for mobile and web applications. It supports Android, iOS, and web platforms, including React Native, Flutter, hybrid apps, and web views, enabling developers and testers to write cross-platform tests using a human-readable YAML syntax. Maestro’s interpreted execution engine allows fast iteration without compilation, and its built-in smart waiting and flakiness tolerance reduce test instability common in UI automation.

The tool offers multiple ways to run tests: via a command-line interface (CLI), a visual IDE called Maestro Studio, and a scalable cloud service for parallel test execution. Maestro Studio empowers users of all technical levels to visually build, record, and inspect tests, with AI assistance through MaestroGPT to generate commands and answer questions. The cloud infrastructure supports running hundreds of tests in parallel with enterprise-grade reliability, notifications, and debugging tools, making it suitable for continuous integration (CI) workflows.

Maestro stands out by combining simplicity, cross-platform coverage, and resilience in one framework. Unlike predecessors like Appium or Selenium, it uses declarative YAML flows that are easy to write and maintain, while automatically handling dynamic UI delays and element flakiness. Its support for modern UI frameworks such as Jetpack Compose, SwiftUI, and .NET MAUI further broadens its applicability. Getting started requires only Java 17+ and a single installation script, with comprehensive documentation and community support available. Developers can quickly write their first test in under five minutes and scale testing efforts seamlessly as projects grow.