Just in from the news desk πŸ“°: Release of Dart 3.9 and Flutter 3.35

Google for DevelopersAbout 2 min readAug 29, 2025Watch original
THE SUMMARYAI-generated

Key Concepts:

  • Dart 3.9
  • Flutter 3.35
  • Multiplatform app development
  • Accessibility
  • Semantics locales
  • Semantics label builder
  • Material and Cupertino libraries
  • Dart and Flutter MCP server
  • AI coding agents (Gemini CLI)
  • Dart SDK

Dart 3.9 and Flutter 3.35 Release Announcement

The announcement focuses on two new releases, Dart 3.9 and Flutter 3.35, both aimed at accelerating the development of multiplatform applications.

Accessibility Enhancements in Flutter 3.35

A significant emphasis is placed on accessibility improvements within Flutter 3.35. The goal is to create more inclusive Flutter applications.

  • Semantics Locales Support: New support for semantics locales has been added. This ensures that accessibility information is presented in the user's preferred language. This is particularly important for international users.
  • Semantics Label Builder: A new semantics label builder simplifies the process of constructing semantics information from complex data. This includes scenarios where combining concepts from multiple locales is necessary.

Material and Cupertino Libraries Updates

Ongoing work continues on the Material and Cupertino libraries. This provides developers with greater control over the look and feel of their applications.

Dart 3.9 and the Dart and Flutter MCP Server

Dart 3.9 now includes the Dart and Flutter MCP (presumably Machine Code Processing) server. This server is available on the stable channel of the Dart SDK.

  • AI Coding Agent Integration: The MCP server is designed to enhance the capabilities of AI coding agents like Gemini CLI. It allows these agents to gain a comprehensive understanding of Dart projects.
  • Enhanced AI Capabilities: With the MCP server, AI agents can now perform tasks such as:
    • Adding dependencies
    • Running code generation steps
    • Debugging runtime layout issues (by accessing stack traces or analyzer feedback)

Call to Action

Viewers are encouraged to visit the blog for a more in-depth exploration of the new features and updates.

Conclusion

The Dart 3.9 and Flutter 3.35 releases bring significant improvements to multiplatform app development, with a strong focus on accessibility and enhanced AI integration through the Dart and Flutter MCP server. The updates aim to provide developers with more control, better internationalization support, and improved tooling for building inclusive and robust applications.

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