WattSeal is a free, open-source desktop app that shows your PC's power consumption in real time — broken down by application. It reads directly from hardware energy counters (RAPL for Intel/AMD CPUs, NVML for NVIDIA GPUs), so the numbers reflect actual silicon draw, not CPU percentage estimates. Each app's wattage is converted to electricity cost and CO₂ based on your local grid.
Works on Windows, macOS, and Linux. Built in Rust. No telemetry, all data stays local.
No existing tool bridged the gap between process-level data and real power data. Task Manager shows percentages — not watts. HWiNFO shows GPU and CPU watts — not total and per app. We wanted to answer one simple question: which application is responsible for my electricity bill?
wattseal.com — source on GitHub
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