2026
cellium
Native macOS battery observatory with local history, alerts, learning, and an evidence-aware AI assistant.
Cellium is a native macOS menu bar application for understanding what is happening to a Mac's battery and power system.
It keeps history locally, separates measured signals from estimates, and turns battery, temperature, system activity, and cycle information into a calmer operational view. Deterministic alerts and local learning help surface changes that are worth acting on.
The optional AI assistant is grounded in the same local evidence instead of presenting unsupported estimates as facts. Cellium is released under the MIT license.