Updated Oct. 26, 2026, 1:40 a.m. ET: Adds that TMOG now offers a paid Pro tier alongside the free app.
Dave Plummer, who wrote the original Windows Task Manager more than 30 years ago, has built a new one, and this time it runs on macOS and Linux as well as Windows. TMOG, short for Task Manager OG, launched in beta as a free download.
The pitch is a single dense view that tells you which process and which subsystem is responsible for whatever your computer is doing right now. “Your computer’s fan just spun up. TMOG names the process before it spins down,” the site says. It compares CPU, memory, disk, network and energy impact side by side, with views for performance, processes, services, startup apps, connections, power and frequency, disk space and benchmarks.
Native on every platform
TMOG skips Electron and web views entirely. It uses Swift and AppKit on macOS, C++ and Win32 on Windows, and C++ with Qt 6 on Linux, all on top of one shared C++20 measuring core. The CPU view keeps performance and efficiency cores distinct and can switch between overall, logical-processor and NUMA views, and an Energy view shows watts, power state and the processes responsible.
Plummer leans hard on accuracy. “A measuring instrument should never make up an answer,” the site says. TMOG distinguishes a measured zero from a missing reading and leaves gaps in graphs when samples stop instead of smoothing over them. It also pairs each process ID with its creation identity so a recycled PID can’t send an action to the wrong process. You can turn on self-monitoring to see what TMOG itself costs.
The app sends no usage statistics, hardware inventory or process information, and its only routine network request is an update check. The core app remains free, and Plummer has since added a paid TMOG Pro tier with features such as Flight Recorder, which records and replays telemetry panels in a shared .tmogtrace format across all three platforms.
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