WattBar displays real-time power consumption data in the Mac menu bar, tracking system power draw, charger supply, and battery flow simultaneously. (Free)
The app ranks CPU energy usage by application across configurable 5–30 minute intervals, identifying which processes consume the most power over time. A live 15-minute graph provides instantaneous watt readings, while battery health tracking spans 30, 90, or 365 days. Historical data includes hourly and daily energy consumption records, with optional electricity cost estimates calculated using local rate settings.
All data is processed and retained on-device with no account creation, analytics collection, or cloud synchronization required. The menu bar indicator provides continuous feedback, making it straightforward to identify when the Mac is drawing more power than the charger can supply — a common scenario during sustained CPU-intensive tasks on MacBooks.
System requirements: macOS 26.0 (macOS Tahoe) or later; requires compatible Apple Silicon or Intel hardware.
Pricing: (Free)
Limitations: Requires macOS 26.0, excluding all Macs running macOS 15 (Sequoia) or earlier. Electricity cost estimates require manual entry of local utility rates. The app focuses on power metrics only and does not include other system diagnostics such as CPU temperature or fan speed.
Alternatives: Stats (open-source, broader system monitoring including CPU, memory, and network); iStatistica Pro (comprehensive system stats with charting); coconutBattery (battery health focused, does not show live watt draw).
Suitable for users on macOS Tahoe who want detailed insight into Mac power consumption, battery longevity, and charger efficiency without sending data off-device.
