FlowStorm vs pyOCD

FlowStorm is a tracing debugger for Clojure and ClojureScript. It records execution without requiring breakpoints or code changes, then provides tools to step through code, inspect values, explore calls and functions, and investigate exceptions. A timeline displays execution events so users can follow how instructions from different threads interleave. The debugger also supports customizable real-time visualizations and plugins for specialized ways to examine recordings. Values shown in its interface can be sent to the REPL with one click, and recordings can be analyzed using Clojure. The guide covers ClojureScript in browsers, Node.js, and React Native, as well as remote debugging configurations and integrations for Emacs through Cider Storm, VS Code, and IntelliJ IDEA. FlowStorm is free and open source at free, and is listed for Linux, macOS, Windows, and self-hosted use. Minimum requirements are JDK 17 or later and Clojure 1.10.0 or later. Vanilla FlowStorm does not support async/await introduced in ClojureScript 1.12.145; the guide points to ClojureScriptStorm as an alternative.

pyOCD is a Python tool and API for debugging, programming, and exploring Arm Cortex microcontrollers. Its GDB server supports command-line debugging and IDE workflows, including Arm CMSIS Debugger, Cortex-Debug, and Eclipse Embedded CDT. It can program firmware and data images into internal or external flash, or load images into RAM. The Python API controls target devices and can support CI setups and custom test or debug tools. More than 70 common Arm Cortex-M devices have built-in support, with CMSIS Device Family Packs available for additional devices. Features include semihosting, SWV, and CMSIS-Pack support. Built-in probe plug-ins include CMSIS-DAP, Raspberry Pi Picoprobe, SEGGER J-Link, STLink, and pyOCD remote; PE Micro Cyclone and Multilink require a separate plug-in. A server and client can share probes over TCP/IP. pyOCD requires Python 3.9 or later and runs on macOS, Linux, FreeBSD, and Windows. It is free, with code licensed under Apache 2.0. Unlocking a supported locked device can require a mass erase, which erases its data.