Maestro
An open-source framework for fast, reliable UI and end-to-end testing of mobile and web apps using human-readable YAML flows.
Overview
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.
The Problem
UI testing for mobile and web apps is often complex, brittle, and slow to maintain due to dynamic interfaces, platform fragmentation, and flaky test executions. Teams struggle to write reliable, cross-platform tests that keep pace with rapid development cycles and diverse UI frameworks.
The Solution
Key Features
Visual test builder and element inspector
Record interactions and inspect UI elements visually in Maestro Studio.
Parallel test execution on cloud
Scale test suites with enterprise-grade infrastructure and reduce execution time by up to 90%.
Simple installation and fast iteration
Single binary install with interpreted tests that rerun on file changes instantly.
Key Strengths
How Developers Use Maestro
Cross-platform mobile app UI testing
Developers write YAML flows to automate UI interactions and assertions on Android and iOS apps, including native and hybrid frameworks.
Web application end-to-end testing
QA teams automate browser-based workflows for React, Flutter Web, and other web apps using the same Maestro framework.
CI/CD integration with scalable cloud testing
Engineering teams integrate Maestro Cloud into CI pipelines to run tests in parallel, get notifications, and catch regressions early.
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Pricing
Free | Cloud | |
|---|---|---|
| Price (Monthly) | Free | Custom pricing |
| Price (Annual) | Free | Custom pricing |
| Messaging | N/A | Built-in notifications for test results |
| Support | Community support via Slack and GitHub | Enterprise-grade support available |
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Resources
Maestro provides extensive documentation, a public Slack community, a blog with updates and tutorials, and an open GitHub repository for contributions and issue tracking.