每个 App 的能耗
免费
哪些 App 在用电，以瓦为单位，实测数字与估算值分开显示。
The problem
Your battery drains faster than it should, and Activity Monitor's Energy Impact is a relative score, not a unit. It does not tell you how many watts an app draws, or what the chip as a whole is using.
The Energy view shows watts: per app where macOS keeps a counter, and for the chip split into CPU, GPU, Neural Engine and memory where your Mac reports them. Where a number is an estimate, it says so, and an estimate never reaches a receipt.
How it works
- Read the counter. macOS keeps a running energy total for each process. Hedroom takes the difference over each scan window and adds up an app and its helpers, which gives watts.
- Mark estimates. If macOS gives no counter for an app, Hedroom shares the chip's CPU power by CPU time and shows it with "≈" and the word "estimate". An app macOS does not let Hedroom read shows no number, never 0.
- Read the chip. Chip power comes from a macOS interface Apple does not document, so Hedroom checks it works on your Mac and says so when it does not.
- Keep the battery separate. The "time left" figure uses the battery's own voltage and current, because chip power leaves out the display, the SSD and the radios.
- Use only measured values in receipts. Estimates are never stored. A receipt uses an app's own watts only when it has at least 3 measured readings before the action, and counts a change only from 0.3 W.
What you will see
On the CPU & Energy screen, the Energy tile shows battery percentage and the measured chip watts with their split. On battery it also shows what the whole Mac draws from the battery. Under "Top energy users", up to five apps are listed with watts: "1.4 W" when measured, or "≈ 1.4 W · estimate" when not. The list stays hidden until at least one app uses 0.05 W or more.
If macOS stops reporting chip power, for example after an update changes how it is reported, a card says "Energy readings paused". Memory, CPU, rules and storage keep working.
A worked example
Example, not real data
Two apps, two kinds of number
Say the top energy users list shows one app at "1.4 W" and another at "≈ 1.1 W · estimate". The first number is read from macOS's own counter for that app. The second is the chip's CPU power divided by CPU time, because macOS gave no counter for it. Idle power lands on whoever ran, so treat it as a guide.
You move the first app to the efficiency cores. Hedroom's receipt uses its measured watts and reports the change if it clears 0.3 W. For the second app, a receipt would fall back to another measure instead of building on an estimate.
Details and limits
它做什么
- 从 macOS 为每个进程保留的能耗计数器中读取每个 App 的瓦数。
- 当 macOS 没有给出某个 App 的计数器时，显示一个估算值（把芯片的 CPU 功耗按 CPU 时间分摊），并标上“≈”和“估算”。
- 在“能耗”磁贴上显示芯片功耗，在 Mac 报告的地方，按 CPU、GPU、神经网络引擎和内存分开。
What it will not do
- 把估算值当作测量值呈现，或把估算值存起来。回执只使用实测的每个 App 的瓦数。
- 把芯片瓦数当作电池消耗。“剩余时间”的数字使用的是电池自身的电压和电流。
Limits
- 并不是每台 Mac 都会报告每一路功耗通道。Hedroom 显示它能读到的，其余的不显示。
免费还是 Pro
可免费查看。
Seeing where your power goes changes nothing. Moving an app to the efficiency cores is a fix, so that is Pro.
Questions people ask
Is this Activity Monitor's Energy Impact?
No. Hedroom shows watts, and never an Energy Impact score.
How much battery does reading energy use?
One read of the chip's energy counters took about 1 millisecond on the MacBook Pro it was checked on, and Hedroom reads at most once every 3.5 seconds. That is one Mac, not a promise for yours.
Why does "time left" not match the chip watts?
Chip power leaves out the display, the SSD and the radios, so pairing it with time left would overstate battery life. Time left uses the battery's own voltage and current.
Does it need a permission?
No admin password and no special permission. Per-app readings are available for processes your user account can read.