Find CPU-heavy apps
WattBar ranks the top five apps and processes by their share of the CPU energy it observed. Switch time ranges and bring a running app forward directly from its row.
WattBar 1.1 for macOS
See what powers your Mac.
WattBar turns your menu bar into a clear view of the power your Mac is using, the energy your charger is supplying, and the power flowing into or out of your battery. Open it to find busy apps, follow live trends, understand charging, and build a useful local history.
No account, helper, or additional permission prompt required. Readings stay on your Mac.
Power, in plain sight
Version 1.1Start with the live picture, then move from a momentary reading to the apps, trends, and history behind it.
Your Mac's power at a glance
See system power, charger input, battery flow, charging state, and key health readings without leaving the menu bar.
See your busiest apps
Compare the top apps and processes by observed CPU energy over the last 5, 10, 15, or 30 minutes.
Catch power changes live
Follow the last 15 minutes of Mac, charger, and signed battery power, with gaps left visible when readings are unavailable.
Follow battery health over time
Review capacity versus design, full-charge capacity, cycle count, and daily observations across 30 days, 90 days, or one year.
Turn readings into useful history
Review hourly energy across the latest 24 periods and daily energy across 28 days, including recording coverage and optional cost estimates.
Keep the right reading close
Choose system load, adapter input, battery flow, a split view, battery percentage, or an icon-only menu-bar display.
Understand more than a single number
Power + batterySee where power is going
Compare the power your Mac is using with charger input and battery flow. WattBar also explains supported states such as normal charging, a charge-limit hold, or a battery helping an undersized charger.
Watch battery health develop
Follow observed capacity instead of relying on one reading. Daily health records are kept for up to five years and separated after a confirmed battery replacement.
Review energy and cost
See recorded energy hour by hour or across 28 days. Add your electricity rate for a local cost estimate based on the energy WattBar recorded.
Get responsive updates
Overview and Power refresh quickly while visible. WattBar reduces background checks, adapts in Low Power Mode, and pauses collection during system or screen sleep.
Keep control of the display
Pin the panel while you work, choose what appears in the menu bar, adjust measurement precision, and keep existing custom background-refresh preferences.
Clear about what the numbers mean
Honest measurementsUnavailable is not zero
Available readings vary by Mac and macOS. WattBar labels missing information as unavailable, leaves unrecorded chart intervals blank, and shows when app-process coverage is partial.
CPU energy is not total Mac energy
App percentages represent shares of tracked CPU energy only. They do not include GPU, display, or other device energy, and they are not watts or battery-percentage estimates.
History builds while WattBar runs
Live power traces and recent app activity are kept in memory. Energy and battery-health history build from the readings WattBar records; earlier health data is not reconstructed.
Private by design
WattBar has no account, analytics, tracking, or cloud synchronization. Power readings, app activity, battery health, history, and cost settings stay inside the app's local sandbox.