Dave Plummer, the original creator of the Windows Task Manager, has developed a new cross-platform application called TMOG (Task Manager OG) that runs on macOS and Linux. The tool was built using a 107-page specification sheet and a method known as "vibe coding" with the AI chatbot Claude Code. Plummer, who designed the original Windows Task Manager in 1996 for Windows NT 4.0, used the specification sheet as input for Claude Code. After four hours of processing, the AI produced a fully functional application that worked on the first attempt. This development occurred while Plummer was waiting with his son in the hospital following surgery. The macOS beta of TMOG was first released on July 31, with Windows and Linux versions launching on August 23. A paid Pro version was introduced on September 7, offering additional features. TMOG includes 12 different views in a single window, such as a summary dashboard, per-process resource usage, startup applications, and network connections. It features animated status meters running at 60Hz, as opposed to the once-per-second updates in the Windows Task Manager. Retro phosphor themes in green, amber, and blue are also available for a nostalgic look. Plummer emphasized that TMOG will "never make up an answer," ensuring that all data is accurate. The application uses native code for each platform—Swift and AppKit on macOS, Direct2D on Windows, and Qt 6 on Linux—while sharing a common C++ core. A self-monitoring feature allows users to see what resources TMOG itself is using. The goal of TMOG is to simplify system diagnostics. Unlike Windows Task Manager, which can be confusing and misleading, TMOG provides a history of system activity alongside process data, helping users identify the root cause of performance issues more easily. TMOG uses a freemium model, with the free version offering live monitoring on all three platforms. The Pro version, priced at $39.95, includes a feature called Flight Recorder, which records and replays system activity for postmortem analysis of slowdowns. Due to Apple's sandboxing restrictions, the macOS version cannot be sold through the App Store. Plummer initially started the project as a challenge to see if an AI could create a tool like Microsoft Word. He doubted it, but believed a smaller project like TMOG might be possible. Developed in under six weeks with two collaborators and the help of Claude Code, TMOG highlights the potential of AI in reducing development costs and time. While the project is still in beta, the free version is available now for macOS, Windows, and Linux without requiring an account.