MacTime

Tiny macOS menu bar app that estimates time remaining on battery based on:

• current power draw (W) computed from battery current/voltage
• remaining battery energy (Wh) computed from current capacity (already reflects battery wear)

It avoids flaky time estimates and instead calculates (t \approx Wh / W) using IOKit AppleSmartBattery properties.

Screenshots

What it shows

• Menu bar title: time remaining (H:MM) on battery, AC on adapter, ⚡︎ when charging
• Details:
  • time remaining
  • current load in watts
  • remaining / max energy in Wh (when available)

Build

Open mactime.xcodeproj in Xcode and run the mactime scheme.

Or build from CLI:

xcodebuild -scheme mactime -configuration Release build

License

MIT — free for personal and commercial use. See LICENSE.