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Qt – Faster, easier to learn and more open than ever before

Qt is a cross-platform application and UI framework that allows you to write applications once and deploy them across desktop and embedded operating systems without rewriting the source code.  New additions to the Qt product family, added licensing options and new features make Qt faster, easier to learn and more open than ever before:

Hear what's exciting in Qt 4.5 from Qt's own engineers.
View the rest of the videos.

New LGPL Licensing Option

New support and service offerings available for all Qt users.
Qt 4.5 and future versions will be offered under the Lesser General Public License (LGPL) version 2.1.

Get Started Now:
Complete Qt SDK in a Single Install

The Qt SDK includes everything you need to begin cross-platform development with Qt in a single install:

  • Qt Creator cross-platform IDE
  • Qt libraries
  • Qt Linguist translation & internationalization tools
  • Available for Windows, Mac and Linux/X11
  • Embedded support coming later this year

Qt SDK Icon

Download the Qt SDK

Qt Creator: The New Cross-Platform Qt IDE

 


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Download the Qt Creator Whitepaper

Qt Creator IconQt Creator is a new cross-platform integrated development environment (IDE) tailored to the needs of Qt developers.  It includes:

  • An advanced C++ code editor
  • Integrated GUI layout and forms designer
  • Project and build management tools
  • Integrated, context-sensitive help system
  • Visual debugger
  • Rapid code navigation tools

Learn more, and download Qt Creator.

 

Performance and New Features in Qt 4.5

Performance Improvements

Performance was the major design goal of Qt 4.5, and major efforts were put into increasing the runtime performance of Qt-based applications through:

  • Focused re-engineering of key functionality
  • A new pluggable graphics system
  • QtBenchLib a new performance benchmarking library,  

Upgrade to 4.5 to realize the performance benefits in your applications;  most engineering work has been done to the core Qt API.


Learn More and See Metrics

Learn more about the performance improvements in Qt 4.5 and see performance comparisons between Qt 4.4 and Qt 4.5 in key areas.

Get the details at Qt Labs


Icon - PDFDownload the Whitepaper
Ensuring Maximum Performance with Qt
[PDF: 12 pages]
Download Now

Upgrade to Latest WebKit Version

Logo - WebKitWith Qt 4.5, the Qt WebKit Integration now utilizes the latest version of WebKit. 
  • Netscape plug in (NPAPI) support, enabling you to to incorporate Flash™ content in your Qt applications
  • Support for HTML 5 including zooming,  CSS-based animations, and more
  • Integration with the lighting-fast SquirrelFish JavaScript engine

See the Qt WebKit Integration in action with two new video demos.

Icon - PDFDownload the Whitepaper
Qt Features for Hybrid Web/Native Application Development
[PDF: 10 pages]
Download Now

64-bit Cocoa Support on Mac

64bit IconQt 4.5 adds support for developing 64-bit applications on top of the new Mac Cocoa API, making it possible for Qt developers to deploy resource-intensive applications to the latest version of the Mac OS (10.5).

Learn more about Qt support for Mac OS X

Additional New Features

Qt 4.5 introduces many other new features across the framework, including:

  • New debugger for the QtScript ECMA standard Qt scripting engine (Check out the video!)
  • XSLT support for transformation of XML content into XML, HTML or other text
  • Support for Open Document Format (ODF)
  • Improved proxy support

For details on all new features included in Qt 4.5, visit the Qt technical documentation.

 

Videos

Qt Creator Video Tutorial Series

Discover the new Qt cross-platform IDE with a series of video tutorials and demos

 

Qt 4.5 Developer Series

Hear what's exciting in Qt 4.5 from Qt's own engineers.

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Qt 4.5 in the Press

"Qt's broad platform support, expansive feature set, and liberal license make it a compelling choice for rapid cross-platform application development. The toolkit's power continues to grow with each new release and Nokia is moving it forward in a really promising direction. Version 4.5 builds on the strengths of the previous version and brings some great additions to the feature lineup. The long-term roadmap, with innovative projects like Kinetic, is equally impressive."

- From First look: Qt 4.5 rocks for rapid cross-platform development, ars technica.

7 Reasons to Choose Qt
  • Write code once to target multiple platforms
  • Reduce software development costs and shorten time to market
  • Rapidly realize the benefits of an advanced GUI framework
  • Produce compact, high-performance applications
  • Count on professional services, support and documentation
  • Choose the license - Commercial, LGPL or GPL - that fits you
  • Take part in an active Qt ecosystem
 

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Customers
Official Nokia site