Arm Keil MDK vs e² studio

Arm Keil MDK is a toolchain for embedded software targeting Cortex-M and Ethos-U processors. MDK v6 supports command-line, IDE, and continuous-integration workflows across major operating systems. It includes Keil Studio extensions for Visual Studio Code, Keil μVision, Arm Compiler for Embedded, and Arm Fixed Virtual Platform models. Software packs add device and board support, middleware, components, code templates, and example projects independently of the toolchain. Keil Studio supports CMSIS workflows with an integrated debugger and extensions for creating, building, and testing embedded applications. Listed integrations include CMSIS-FreeRTOS, Keil RTX5, MDK-Middleware, IoT clients, CMSIS-DAP, ULink, and third-party debug adapters. Community is for non-commercial use. The listed MDK v6 Essential plan costs $99 a month per license; Professional costs $199 a month per license and adds Arm Virtual Hardware, functional-safety compiler tools, and legacy tools including Arm Compiler 5. Keil μVision is available only for Windows hosts.

e² studio is an Eclipse-based integrated development environment for Renesas microcontrollers, supporting work from sample-code access through debugging. Its project wizard creates MCU projects with basic sample code, while Smart Configurator sets clocks, pins, and interrupts and generates code for those settings. The Eclipse CDT editor provides completion, syntax coloring, navigation, folding, automated code constructs, preprocessor checking, and refactoring. Developers can choose Renesas or partner-vendor compilers, but must install them separately; compiler packages are not included in the IDE download. Debugging uses Eclipse CDT's GDB and includes register and memory views, breakpoints, real-time memory display, tracing, and peripheral-register display. Listed hardware includes Renesas E2, E2 Lite, and E20 emulators and SEGGER J-Link. Supported MCU families include RA, RZ, RL78, RX, RH850, and RISC-V. The Linux host version does not support the RE family or Renesas Synergy. e² studio runs on Windows, Linux, and macOS and costs nothing, with no paid version. Separate compiler packages may have their own license terms or evaluation limits.