---
title: "Measured receipt · MacMelon"
description: "Sentinely's receipt is a before-and-after measurement of a fix: Freed (memory that came back) and Felt (memory pressure and swap-in rate). No time saved."
url: "https://macmelon.com/glossary/measured-receipt"
---

# Measured receipt

Sentinely's record of a fix: what was freed and what changed for you, measured after the fix rather than promised before it.

Every fix in [Sentinely](https://macmelon.com/apps/sentinely) produces a receipt with two parts. Freed is the memory footprint of the processes that are now gone, measured at least ten seconds after the fix from a fresh reading and confirmed at one minute. Felt is what changed for you: memory pressure and how often the Mac reads memory back from swap, before versus after.

A receipt can say nothing improved, and then it does. It never converts results into time saved or a percentage faster, because those cannot be measured honestly. Lifetime totals add up only measured bytes. The full method is on [How Sentinely measures](https://macmelon.com/how-sentinely-measures).

## Apps

[No more Force Quit in the middle of a build. ### Sentinely](https://macmelon.com/apps/sentinely)

## Related guides

[### How to find what's slowing down your Mac](https://macmelon.com/guides/how-to-find-what-is-slowing-down-your-mac)

## Related use cases

[### Find out why your Mac is slow](https://macmelon.com/use-cases/find-out-why-your-mac-is-slow)[### Stop AI-tool helpers left running after you close your editor](https://macmelon.com/use-cases/stop-leftover-ai-helpers-and-mcp-servers)

## Related terms

[The memory macOS charges to a process, including memory it has compressed. Sentinely's unit for estimates and receipts. ### Memory footprint](https://macmelon.com/glossary/memory-footprint)[Memory macOS has moved from RAM to the startup disk because RAM ran short. ### Swap](https://macmelon.com/glossary/swap-memory)[How hard macOS is working to make room in memory. The signal that a Mac is actually short on memory, not just using it. ### Memory pressure](https://macmelon.com/glossary/memory-pressure)