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 Apr 14, 2014

  Placing

  Up until now debugging location oriented applications in the simulator was a bit painful, there was no real way other than coding to a specific location and if you relied on specific GIS...

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  Permalink Apr 7, 2014

  Please Help Us By Filling The Developer Economics Survey

  The last time we had a developer economics survey you guys really came thru and made us one of the top contributors for that survey! This year the stakes are even higher and the incentive for referrals is greater...

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  Permalink Apr 2, 2014

  Leading

  One of our enterprise accounts was using lead component in a rather unique setting and needed a way to "unlead" essentially disable the lead component functionality which is one of those things we never imagined people doing...

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  Permalink Mar 31, 2014

  New Android Pipeline Fixes

  We introduced a new rendering pipeline for Android a while back, it showed a lot of potential but unfortunately still had some major bugs. Chen just made some major fixes for this pipeline which should hopefully address those issues...

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  Permalink Mar 26, 2014

  Windows Phone Improvements & Build Screenshots

  A lot of developers have asked us for QR code support on Windows Phone 8, we finally took the plunge with the first attempt here. It seems QR support for ZXing on Windows Phone is WAY behind the level on Android or iOS...

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  Permalink Mar 24, 2014

  Androids Permissions

  One of the annoying tasks when programming native Android applications is tuning all the required permissions to match your codes requirements, when we started Codename One we aimed to simplify this...

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  Permalink Mar 19, 2014

  Processing, Responsiveness, Native & more

  Some of you have already noticed a build error when building for iOS if you used the processing package. This is due to a small change we made to the package where we replaced all usage of Hashtable/Vector with Map/List...

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  Permalink Mar 17, 2014

  Mapping Natively

  This has been a frequent RFE in the groups but it never made its way up because of the complexity involved. A corporate account recently requested support for native Maps so we had to promote the task upwards. We decided to build the native maps as...

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  Permalink Mar 12, 2014

  The 7 Screenshots Of iOS

  Have you ever noticed how iOS apps start almost instantly in comparison to Android apps? There is a trick to that. iOS applications have a file traditionally called Default.png that includes a 320x480 pixel image of...

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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...