Arm Keil MDK vs nRF Connect for VS Code

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.

nRF Connect for VS Code is a free extension for developing, building, and debugging applications based on the nRF Connect SDK. It supports nRF91, nRF70, nRF53, and nRF52 Series devices, with interfaces to the compiler and linker and an RTOS-aware debugger. Configuration tools include a DeviceTree Visual Editor and a Create New Board wizard. The environment includes a built-in terminal and both command-line and graphical interfaces, with integrated flashing listed. The product consists of four Nordic extensions: nRF Connect for VS Code, nRF DeviceTree, nRF Kconfig, and nRF Terminal. Nordic says all four must be installed and used together for the product to work correctly with supported SDKs and provide all features. The main extension is available through the Visual Studio Code Marketplace; Nordic documentation also lists the extensions in the Open VSX Registry for VSIX-compatible editors. It runs on Windows, macOS, and Linux. Nordic identifies nRF Connect for Desktop and nRF Command Line Tools as additional desktop tools, and recommends its nRF Connect SDK Fundamentals course for getting started. Nordic Semiconductor is headquartered in Trondheim, Norway, and was established in 1983.