回執
可免費查看，更改需要 Pro
操作前的讀數，操作後的讀數，每次操作一個誠實的結論。
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
它做什麼
- 把操作前約 5 分鐘的讀數，與操作後 5 到 15 分鐘的讀數進行比較。
- 數字有變化時寫「已測量」，沒有變化時寫「沒有可測量的效果。」，其他 App 變化太大而無法判斷時寫「無法測量」。
- 對於清理，會報告哪些內容進了垃圾桶。只有清倒垃圾桶之後，磁碟空間才算釋出。
What it will not do
- 為它無法測量的變化居功。
- 在檔案仍在垃圾桶裡時，就聲稱磁碟空間已釋出。
Limits
- 回執比較的是兩個時間視窗。它不是對照實驗。
- 一個很小的真實變化，可能會顯示為「沒有可測量的效果」。Hedroom 寧願錯過一點小收獲，也不會聲稱一個它拿不出證據的成果。
免費還是 Pro
過去的回執在免費版中仍可閱讀。新的回執隨 Pro 而來，因為它們隨操作而來。
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.