B4X

Develop Android, iOS and IoT applications

B4J – RAD development tool for cross platform desktop, server and IoT solutions

B4J is a 100% free development tool for desktop, server and IoT solutions.
With B4J you can easily create desktop applications (UI), console programs (non-UI) and server solutions.
B4J apps can run on Windows, Mac, Linux and ARM boards (such as Raspberry Pi).
The compiled apps are standalone, without any external dependencies.

Download B4J Full Version (64-bit)

Consider supporting B4J by contributing to its development: $10 $20 $40 $100

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Installation

1.OpenJDK 19
  • OpenJDK 19 + OpenJFX: download link.
    License: GPL + classpath exception. License permits usage in closed commercial projects.
    Download the zip and unpack it. C:\java is a good place for it.
    It is recommended to use a tool such as 7-Zip to unzip the large package. Windows Explorer might fail to extract it properly. Installation is not required.

2. Install and configure B4J
  • Download B4J Full Version
  • Open B4J.
  • Choose Tools > Configure Paths.
    It will be similar to 'C:\java\jdk-14.0.1\bin\javac.exe' or 'C:\Program Files\Java\jdk1.8.0_151\bin\javac.exe'
    Configure Paths
  • Use the Browse button to locate "javac.exe".
    javac is located under <java folder>\bin.
3. Next Steps

Documentation

Learning resources

Frequently asked questions

Q: Is B4J completely free, including for commercial purposes?

A: Yes.

Q: How to build notarized Mac apps?

A: Follow these instructions.

Q: Can I reuse B4X code with B4J?

A: Almost all of the code and layouts can be reused. Especially when using XUI + B4XPages librares.

Q: How is B4J performance?

A: The performance of programs developed with B4J are excellent, and are similar to the performance of C# based programs.
Two examples: Primes benchmark and Server performance.

Q: Is a 32-bit version available?

A: B4J v9.30 is the latest 32-bit version.

Q: Which versions of Java are supported?

A: Java 8+ is supported. UI apps depend on JavaFX, which isn't included by default with Java 11 (it is included in the package linked above).