Easily create native apps using Java™ for iOS, Android, Windows, RIM and more!

Codename One powers more than 25,000,000 devices

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Codename One is the only Java iOS tool that currently comes close to the old "Write once, run anywhere" mantra...

JavaWorld

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Java Cloud

Use Eclipse, NetBeans or IDEA to build native mobile apps using the cloud.

Java Cloud

Use Eclipse, NetBeans or IDEA dev environments & our GUI builder. Quick & easy install! Build native apps using our cloud build servers.

Try Now!

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Free & Open Source

Codename One is open source & free for use!

Open Source

Codename One has an amazing supportive community of developers, it is open source and free for both commercial & non-commercial use!

Community Forum

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Fast & Native

Java bytecode is translated to native C/ObjC code and compiled using xcode for seamless mobile application development

Fast & Native

Codename One adapts the code to match the native platform, on iOS the bytecode is statically translated to C/Obj-C and compiled on the server. On Android Codename One leverages Dalvik and so forth!

How Does It Work?

Press

• If I had to choose a startup to invest in this year, it would have to be Codename One. [...] I expect them to experience significant growth in 2013.
• Codename One is the only Java iOS tool that currently comes close to the old "Write once, run anywhere" mantra, and it provides the most coherent development experience.
• Codename One [...] stands to drastically change the rate and cost at which developers will churn out new mobile apps.
• Codename One [...] uses special lightweight technology that eliminates fragmentation and offers developers a platform for mobile application development as easy as desktop development.
• The Java development/debugging is done entirely locally, but when building for the device, the cloud portion does all the heavy lifting

Learn about Codename One based on what you already know...

Android developer

Swing developer

Executive

Java Developer

Built with Codename One (click items to launch extended gallery)

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  Qmarkets

  iOS, Android
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  yHomework

  iOS, Android
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  Pumpop

  Android, J2ME
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  iRegion

  iPhone/iPad, RIM, Android
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  Readerware

  Android, iOS

Latest entries from our blog

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  Permalink Mar 10, 2014

  Cloud Files

  Cloud files are a great pro feature that we didn't emphasize enough, its remarkably useful. It allows you to upload a file into the cloud which you can then transfer to anyone thru a simple "obfuscated" URL. The URL is long so the probability of someone...

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  Permalink Mar 5, 2014

  Corporate Guide

  We recently introduced the corporate server option which is seeing initial deployments right now. As part of that we are now publishing the install guide to the general public, if you are considering the option of...

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  Permalink Mar 3, 2014

  Image From URL Made Easy

  ImageDownloadService is one of the first classes we wrote when creating the original IO package, as such we were still thinking over the API and the code... stinks...

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  Permalink Feb 24, 2014

  JSON, Overscroll & More

  Its been pretty busy around here the last couple of weeks. However, we still introduced a couple of new API's and abilities besides the many bug fixes that constantly go in. We deprecated JSONParser.parse(Reader) in favor of...

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  Permalink Feb 18, 2014

  Device Bugs And Updates

  We've been even more busy than usual with our first corporate deployment kicking off, this is currently a pretty rough process that requires a lot of hands on help from us but we hope to make it less painful for our customers...

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  Permalink Feb 12, 2014

  Calendar & Small Changes

  I've been working a bit with Kapila and Andreas on a Calendar project for Codename One to be used as a cn1lib (working is a strong word I've mostly just bossed them around and didn't really do much, they did all the work)...

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  Permalink Feb 10, 2014

  Wheel & Drag

  In the latest update to desktop builds we made the mouse wheel scroll the UI which is something that we've meant to do for ages but just didn't get around to doing. This will also work in the simulator when the next update arrives...

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  Permalink Feb 5, 2014

  Desktop, Vision Mobile & Misc Changes

  We toggled the new pipeline mode for windows phone to be the default, its clearly the way to go forward in the long run since we just don't have any other choice. All feedback on the new pipeline found it to improve performance significantly...

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  Permalink Feb 3, 2014

  A New Pipeline For Windows Phone

  The Windows Phone port is one of our most painful ports, the platforms is so fragmented, volatile and rigid its remarkably hard to extract a common porting layer that will satisfy our requirements. We've just updated our servers with the 3rd port...

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  Permalink Jan 29, 2014

  Push Notification Tutorial

  We've just uploaded a new how do I tutorial for push notification. This tutorial covers the basics and is complementary to the post we published a while back covering push.

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  Permalink Jan 27, 2014

  A New Pipeline

  One of our enterprise developers started complaining about the performance of our Android port, which forced us to take a closer look at our rendering pipeline on Android. It seems that Google’s hardware acceleration broke pretty much...

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  Permalink Jan 21, 2014

  Switching Defaults

  As you may know Apple will require that all applications submitted next month would be compiled with XCode 5 and target iOS 7 primarily. We supported this for quite some time however the default was still set to the legacy...