Side by side
B4R vs CS+
Both stand on embedded development ides. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Windows
Choose B4R if you need a free Windows tool for native Arduino, ESP8266 or ESP32 programs, including commercial work. Look elsewhere if integrated debugging is essential or you need a desktop platform other than Windows.
Visit B4R Free plan LinuxMacWindows
CS+ offers MCU-focused development tools, background builds and debugging support through compatible emulators. Confirm that your MCU family and Windows environment match the listed support, and account for compiler evaluation limits or separate emulator costs.
Visit CS+The facts
| B4R | CS+ | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Windows | Linux, Mac, Windows |
| Lowest paid plan | Free or on request | Free or on request |
| Plans published | 1 | 2 |
| Maker | Not published | Not published |
| Website | b4x.com | renesas.com |
| On embedded development ides | #8 of 29 | #4 of 29 |
B4R: what it does well
- Free plan permits commercial use.
- Targets Arduino-compatible boards, ESP8266 and ESP32.
- Integrated flashing is available.
- B4R libraries use the MIT license.
- Learning materials and a user forum are linked.
What to know first
- Windows is the only listed desktop platform.
- Integrated debugging is not available.
- Setup requires Arduino IDE v2, Arduino CLI and Java.
CS+: what it does well
- Free IDE for development and production.
- Background builds modified or saved source files.
- Supports specified Renesas MCU families.
- Smart Browser includes device information and sample code.
What to know first
- Compatible debugging emulators are sold separately.
- Some MCUs do not support code generation.
- 32-bit use requires CS+ IDE V8.06 or earlier.
- Evaluation compiler packages may impose limits.