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SPECIFICTION
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B4R

b4x.com

Free plan Windows
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Spec score 7.6 #12 of 29 in Embedded Development IDEs

What it is

B4R is a free Windows development tool for creating native programs for Arduino-compatible boards, ESP8266, and ESP32. Its plan costs nothing and permits commercial use. The product page lists a modern IDE, connectivity options, and an Arduino–Android Bluetooth Low Energy example. Integrated flashing is available, but integrated debugging is not. Setup requires Arduino IDE v2, Arduino CLI, and Java; OpenJDK 14 is listed when Java is not already installed. Users configure 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 appear in the Objects folder. B4R libraries are open source under the MIT license. The product page links learning resources, example projects, tutorials, and a forum. Anywhere Software directs technical questions to its forum and says email inquiries receive answers within 24 hours. The maker identifies Erel Uziel as founder and CEO and says it has specialized in mobile development since 2005.

Spec sheet

Purpose
B4R is a development tool for building native programs for Arduino, ESP8266 and ESP32.Read 8 Oct 2026 · b4x.com
Support
Anywhere Software directs technical questions to its forum and says it answers email inquiries within 24 hours.Read 8 Oct 2026 · b4x.com
Maker
Anywhere Software says it has specialized in mobile development since 2005 and develops rapid application development tools for various platforms.Read 8 Oct 2026 · b4x.com
BLE example
The product page includes an Arduino–Android BLE connection example.Read 8 Oct 2026 · b4x.com
Board setup
Users configure paths to arduino-cli.exe and javac, then select a board type and serial port in the Board Selector.Read 8 Oct 2026 · b4x.com
Documentation
The page links to learning resources, example projects, tutorials and a B4R forum.Read 8 Oct 2026 · b4x.com
Founder
The maker identifies Erel Uziel as Anywhere Software’s founder and CEO.Read 8 Oct 2026 · b4x.com
IDE
The product page lists a modern IDE and many connectivity options.Read 8 Oct 2026 · b4x.com
Library license
B4R libraries are open source under the MIT license.Read 8 Oct 2026 · b4x.com
Setup requirements
Installation requires Arduino IDE v2, Arduino CLI and Java, with OpenJDK 14 listed if Java is not already installed.Read 8 Oct 2026 · b4x.com
Source and objects
The C source code and generated compiled objects are available in the Objects folder.Read 8 Oct 2026 · b4x.com

Plans and prices

B4R Free Free, including for commercial purposes Native Arduino, ESP8266 and ESP32 programs Read 8 Oct 2026 · b4x.com

Every B4R plan and price →

Strong points and limits

Strong points

  • Free for commercial use
  • Targets Arduino-compatible boards, ESP8266, and ESP32
  • Integrated flashing is available
  • Libraries use the MIT license
  • Learning resources and forum are provided

Limits

  • Windows desktop platform only
  • Integrated debugging is not available
  • Requires Arduino IDE v2, CLI, and Java
  • Board paths and serial port need manual setup

Who it suits

It suits Windows developers building native programs for Arduino-compatible, ESP8266, or ESP32 hardware. Users comfortable installing Arduino tools, Java, and board configuration can use its free commercial plan.

Verdict

B4R offers a no-cost Windows environment for supported microcontroller targets, with source and compiled objects accessible locally. Its setup dependencies and lack of integrated debugging matter when planning a development workflow.

Where Specifiction places it

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