B4R
What it is
B4R is a free Windows development tool for building native programs for Arduino-compatible boards, ESP8266, and ESP32. The product lists a modern IDE, connectivity options, and an example linking Arduino with Android over Bluetooth Low Energy. Integrated flashing is available, while integrated debugging is not. Setup requires Arduino IDE v2, Arduino CLI, and Java; OpenJDK 14 is listed when Java is not already installed. Users set paths to arduino-cli.exe and javac, then choose a board type and serial port in the Board Selector. C source code and generated compiled objects are available in the Objects folder. B4R libraries are open source under the MIT license. The page links to learning resources, projects, tutorials, and a forum. Anywhere Software directs technical questions to its forum and says email inquiries receive answers within 24 hours. The free plan includes commercial use.
For and against
For
- Free for commercial purposes
- Targets Arduino, ESP8266, and ESP32
- Integrated flashing included
- C source and compiled objects available
- Libraries use the MIT license
Against
- Windows desktop platform only
- Integrated debugging is unavailable
- Requires Arduino IDE v2 and CLI
- Java installation may be required
The verdict
B4R offers a free Windows workflow for native Arduino-family development, with flashing, source access, and open-source libraries. Developers must install the listed toolchain and use forum support when needed.
Who it suits
B4R suits Windows developers targeting Arduino-compatible boards, ESP8266, or ESP32. It is also relevant to users who want open-source libraries and forum-based learning resources.
Plans and prices
B4R
Native Arduino, ESP8266 and ESP32 programs
Read 8 Oct 2026 · b4x.com
On the record
- BLE example
- The product page includes an Arduino–Android BLE connection example.b4x.com · read 8 Oct 2026
- Board setup
- Users configure paths to arduino-cli.exe and javac, then select a board type and serial port in the Board Selector.b4x.com · read 8 Oct 2026
- Documentation
- The page links to learning resources, example projects, tutorials and a B4R forum.b4x.com · read 8 Oct 2026
- Founder
- The maker identifies Erel Uziel as Anywhere Software’s founder and CEO.b4x.com · read 8 Oct 2026
- IDE
- The product page lists a modern IDE and many connectivity options.b4x.com · read 8 Oct 2026
- Library license
- B4R libraries are open source under the MIT license.b4x.com · read 8 Oct 2026
- Maker
- Anywhere Software says it has specialized in mobile development since 2005 and develops rapid application development tools for various platforms.b4x.com · read 8 Oct 2026
- Purpose
- B4R is a development tool for building native programs for Arduino, ESP8266 and ESP32.b4x.com · read 8 Oct 2026
- Setup requirements
- Installation requires Arduino IDE v2, Arduino CLI and Java, with OpenJDK 14 listed if Java is not already installed.b4x.com · read 8 Oct 2026
- Source and objects
- The C source code and generated compiled objects are available in the Objects folder.b4x.com · read 8 Oct 2026
- Support
- Anywhere Software directs technical questions to its forum and says it answers email inquiries within 24 hours.b4x.com · read 8 Oct 2026
