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Gorgeous native mobile app development with Java or Kotlin for iPhone, Android etc....

Learn more in our academy... Hours of free content

BuildWrite code in Java(tm) using Eclipse, NetBeans or IntelliJ/IDEA

TestVerify your app with our simulator, devices & test automation tools

DeployGenerate native binaries for all device types using the Codename One build cloud

180M App Installs

40K Developers

1M Cloud Builds


Chidiebere Okwudire
Chidiebere Okwudire SMash ICT Solutions/Senior Engineer at Sioux, Netherlands

"Affordable cross-platform toolchain that works!"

Easy extension with third-party libraries, active developer support and attractive pricing...

Ram Nathaniel
Ram Nathaniel CEO & Founder of MathUnderground, Israel

"Over 2 million active installations"

[A] mature, solid & reliable platform. It allows you to concentrate [on] developing your app, not platform specific implementations...

Fabrício Cabeça
Fabrício Cabeça Senior Developer at Pmovil, Brazil

"Going from design to working app is a breeze"

Codename One greatly reduced our development time and costs, while giving us the ability to deliver a custom experience in each platform when needed.

Ali Sayed
Ali Sayed Senior Developer, Egypt

"The best cross platform app development tool"

Its native access allowed us to add functionalities without limiting developers to platform capabilities.

Fabrizio Grassi
Fabrizio Grassi Chemetall, Italy

"a true write once run anywhere solution!"

Codename One has proven to be a productive tool for us - a true write once run anywhere solution!

Rex Green
Rex Green Vision24, South Africa

"Fast & efficient"

Fast & efficient way to eliminate the hassle of targeting multiple platforms without resorting to HTML5!

Hélio Rugani
Hélio Rugani Sócio Proprietário, Brazil

"Simply a great framework!"

[We had] some non conventional requirements & Codename One gave us good answers for all the challenges that we faced during app development.

Gareth Murfin
Gareth Murfin Developer, Taiwan

"I utilize my Java knowledge to deliver native apps"

I can deliver native apps for both platforms from a single codebase in half the time, at half the cost, with no need to hire anyone.

 Lucky Oscar Masango
Lucky Oscar Masango CTO at BOi Global Group, South Africa

"I would advise to all developers to try it out today!"

[It] has given us the ability to develop apps for all mobile platforms [quickly] & at a low cost. [It's] the most innovative tool of this generation...

What's so special about Codename One?

We are the only ones that provide...
Write Once Run Anywhere, no special hardware & 100% code reuse
Compile Java(tm) or Kotlin to native iOS, Windows (UWP), Android, Desktop & JavaScript
Easy to use with 100% portable Drag & Drop GUI builder
You can control every pixel and draw anywhere
Full access to native OS using the native language (e.g. Obj-C, C# etc.)
Use native widgets & mix them with our components in the hierarchy (heavyweight/lightweight mixing)
Open Source & Free for commercial use with enterprise grade commercial offering

Get started right away!

Start Now! It's Free!

Built with Codename One

Check out the full gallery here & our demos here
Want us to build your mobile app? Learn more here

Latest Posts From Our Blog

Codename One 3.8 is Live

Codename One 3.8 is Live

We are thrilled to announce the release of Codename One 3.8. Codename One is an open source "Write Once Run Anywhere" mobile solution for Java developers!
This new release significantly refines the native look and feel of Codename One, it brings the GUI builder to a new level with styling support. It finally adds Mac OS appstore distribution support which means all the major appstores are now supported targets for Codename One applications.

Tutorial - What is Codename One

Tutorial - What is Codename One

I published this video a while back but it was longer and a bit confusing (over 40 minutes). Since some developers watch it before getting into Codename One I thought it would be in order to streamline it into a more manageable length and transcribe the content like I did with the newer videos. I also cleaned it up a bit and the result is below.

Mac Appstore Builds & Device Farms

Mac Appstore Builds & Device Farms

Steve has been pretty busy. We have new support for Mac Appstore builds as part of our desktop build process. That means you can build a signed Mac desktop app with Codename One which required a bit of work with previous releases. He also adapted our automated tests for Codename One so they would run on device farms and test against major versions of Android.

Codefreeze for 3.8

Codefreeze for 3.8

Codename One 3.8 should land one week from now and from later today we are effectively in code freeze. Please update to the release candidate of 3.8 tomorrow morning to help us track some last minute bugs and regressions. As is usually our process we will release updates as necessary with code reviews and next week we won't have the usual set of releases as we'll take some time off.

Start now! It's free!