回执
可免费查看，更改需要 Pro
操作前的读数，操作后的读数，每次操作一个诚实的结论。
The problem
After you fix something on your Mac, you are left to guess whether it helped, or whether the Mac would have settled on its own. Taking someone's word for it is not proof.
A receipt answers that for every action Hedroom takes. It compares readings from before with readings from after, and gives one of a few honest verdicts, including "No measurable effect." when the numbers did not move.
How it works
- Before. Hedroom takes the median of the 5 minutes of readings before the action. With less than 2 minutes of data, the receipt's confidence drops to low.
- Settle. It skips 30 seconds (60 after a relaunch) while the app reloads and things settle.
- After. It measures for 5 minutes and stops there if the readings are stable, or keeps going up to 15 minutes if they are not.
- Compare. A change counts only if it clears a floor: 100 MB of memory, 10 percentage points of one CPU core, 0.3 W, or 50 MB of disk. If the before readings were noisy, the change must also be larger than three times that noise.
- Say it honestly. The verdict is Measured, No effect, Not measurable (other apps changed too much at the same time) or Cancelled. Confidence is high, medium or low. A low one is labelled rough and left out of totals.
What you will see
The Receipts screen opens with a headline such as "21.3 GB of memory given back, every number measured on this Mac", with chips for fixes, rule actions, disk freed and rules not helping. Below is the list: each row names the action, shows Measured or No effect and a confidence label, and draws before and after bars. Open one for a chart of the measured value with the two windows shaded, the numbers, the confidence and anything that got in the way.
A cleanup receipt shows Put back while the files are still in the Trash. A rule with three no-effect receipts in a row gets a Turn rule off button. Export CSV writes one row per receipt with numbers only, no paths and no file names.
A worked example
Example, not real data
A rule that is not helping
Say you made a rule that pauses Spotify when it has been in the background for 10 minutes. It runs three times. Each receipt compares Spotify's CPU before and after: about 9% of a core both times. That is less than the 10 points Hedroom counts, so each one reads "No measurable effect."
After the third, Hedroom flags the rule: "Pausing Spotify saved nothing in 3 tries. Turn the rule off?" You decide; the rule never turns itself off. Had other apps moved by more than 1 GB in the same minutes, the receipts would have said Not measurable instead, and stayed out of your totals.
Details and limits
它做什么
- 把操作前约 5 分钟的读数，与操作后 5 到 15 分钟的读数进行比较。
- 数字有变化时写“已测量”，没有变化时写“没有可测量的效果。”，其他 App 变化太大而无法判断时写“无法测量”。
- 对于清理，会报告哪些内容进了废纸篓。只有清倒废纸篓之后，磁盘空间才算释放。
What it will not do
- 为它无法测量的变化居功。
- 在文件仍在废纸篓里时，就声称磁盘空间已释放。
Limits
- 回执比较的是两个时间窗口。它不是对照实验。
- 一个很小的真实变化，可能会显示为“没有可测量的效果”。Hedroom 宁愿错过一点小收获，也不会声称一个它拿不出证据的成果。
免费还是 Pro
过去的回执在免费版中仍可阅读。新的回执随 Pro 而来，因为它们随操作而来。
The line is simple: looking at your Mac is free, and acting on it, with the measurement of what the action did, is Pro.
Questions people ask
Is a receipt scientific proof?
No, and it says so. It compares two time windows on your Mac. It is not a controlled trial. Something else you do during a window can show up in the numbers, which is what the Not measurable verdict is for.
Why would I see "No measurable effect" often?
Hedroom prefers to miss a small win than to claim one it cannot show, so a real change smaller than the floors above reads as no effect. It costs you nothing: no credit taken and no total inflated. How to read a receipt explains each part.
Are receipts stored or sent anywhere?
They are stored on your Mac. Receipt rows hold numbers and counts, never file paths. Nothing is uploaded.
Does a disk cleanup count as freed space straight away?
No. Moving files to the Trash frees nothing until the Trash is emptied. The cleanup receipt reports what went to the Trash, and claims free space only when it measurably grew.