B4R
B4R is a free Windows development tool for building native programs for Arduino-compatible boards, ESP8266, and ESP32.
What B4R is
B4R is a free Windows development tool for building native programs for Arduino-compatible boards, ESP8266, and ESP32. Its product page lists an IDE and connectivity options, including an example that connects Arduino with Android over Bluetooth Low Energy. Integrated flashing is available, but integrated debugging is not. Setup requires Arduino IDE v2, Arduino CLI, and Java; OpenJDK 14 is listed as an option if Java is not already installed. After installation, configure the paths to `arduino-cli.exe` and `javac`, then choose a board type and serial port in the Board Selector. The C source and generated compiled objects are available in the Objects folder, and B4R libraries are open source under the MIT license. The free plan permits commercial use. The product page links to learning resources, example projects, tutorials, and a forum. Anywhere Software directs technical questions to its forum and says it answers email inquiries within 24 hours.
Good
- Free plan permits commercial use.
- Supports Arduino-compatible boards, ESP8266, and ESP32.
- Integrated flashing is available.
- Libraries are open source under MIT.
- Learning resources, tutorials, and a forum are linked.
Watch out
- Available for Windows only.
- Integrated debugging is not available.
- Setup requires Arduino IDE v2, Arduino CLI, and Java.
Who it suits
B4R suits developers building native programs for Arduino-compatible boards, ESP8266, or ESP32 on Windows. It may also suit commercial users seeking a free tool with accessible source and compiled objects.
Verdict
B4R provides a free Windows development environment for three listed target families, with integrated flashing and an example BLE connection. Factor in its required setup tools and lack of integrated debugging.
Plans and prices
From B4R's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| B4R | Free | Native Arduino, ESP8266 and ESP32 programs · Free, including for commercial purposes |
The facts
Each one read from B4R's own pages, with the date it was checked.
What it does
- BLE example
- The product page includes an Arduino–Android BLE connection example.checked 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.checked 8 Oct 2026
- Documentation
- The page links to learning resources, example projects, tutorials and a B4R forum.checked 8 Oct 2026
- Founder
- The maker identifies Erel Uziel as Anywhere Software’s founder and CEO.checked 8 Oct 2026
- IDE
- The product page lists a modern IDE and many connectivity options.checked 8 Oct 2026
- Library license
- B4R libraries are open source under the MIT license.checked 8 Oct 2026
- Purpose
- B4R is a development tool for building native programs for Arduino, ESP8266 and ESP32.checked 8 Oct 2026
- Setup requirements
- Installation requires Arduino IDE v2, Arduino CLI and Java, with OpenJDK 14 listed if Java is not already installed.checked 8 Oct 2026
- Source and objects
- The C source code and generated compiled objects are available in the Objects folder.checked 8 Oct 2026
- Support
- Anywhere Software directs technical questions to its forum and says it answers email inquiries within 24 hours.checked 8 Oct 2026
The company
- Maker
- Anywhere Software says it has specialized in mobile development since 2005 and develops rapid application development tools for various platforms.checked 8 Oct 2026
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