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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

Responsive Sign-In Form Using New GUI Builder

Responsive Sign-In Form Using New GUI Builder

For this blog post, I have prepared a couple of video tutorials to walk you through the creation of a Sign In form using the GUI Builder. I have taken the existing Sign In demo project as a basis, but I'm re-doing the UI, which was originally hand-coded, using the GUI Builder.

Course Updates

Course Updates

I hoped to finish migrating all of the material from the original bootcamp to the new courses but got delayed due to external influences. There isn't much left so I'm sure I'll be done with the existing modules in early August and get started on the first of the new modules.

Fractional Padding/Margin, Rounded Border, Ripple, Caps, Google Connect

Fractional Padding/Margin, Rounded Border, Ripple, Caps, Google Connect

We've been very busy the past few weeks despite the summer time but August is always problematic, I will personally take some time off from the blog next week and near the end of August. To allow that I want to clear my table from a lot of the features that went into Codename One over the past couple of weeks and didn't get sufficient or any documentation...

Tutorial - Localization and Internationalization (i18n/l10n)

Tutorial - Localization and Internationalization (i18n/l10n)

Localization and internationalization are probably some of the most important features for a modern app. Most frameworks tuck on localization as an afterthought as authors of such frameworks are often born in the states... Codename One integrates localization, deep into the framework. It becomes transparent and invisible...

Start now! It's free!