---
title: "Why Sentinely won't \"free your RAM\" · MacMelon"
description: "Empty memory is not the goal, and a number we cannot measure is not a result. The rules behind Sentinely's fixes and its measured receipts."
url: "https://macmelon.com/blog/why-sentinely-wont-free-your-ram"
---

# Why Sentinely won't "free your RAM"

By Harish Ganapathi, Co-founder · Published October 13, 2026 · 3 min read

[Memory](https://macmelon.com/blog/tags/memory)[Privacy](https://macmelon.com/blog/tags/privacy)

The easiest Mac utility to sell is a big button that makes a memory number go down. Press it, watch “used” shrink, feel better. We decided early that [Sentinely](https://macmelon.com/apps/sentinely) would not have that button, and this note explains why, along with the other rules we hold ourselves to.

## Empty memory is not the goal

macOS fills spare memory on purpose. Files you opened recently, data an app might need again, pages that are cheaper to keep than to read back: all of it sits in memory because empty memory does nothing for you. When an app needs room, macOS takes it back from that cache.

A tool that forces memory to empty throws that cache away. The number on screen looks better for a minute, then macOS fills memory again with the same things, now reading them from disk. Nothing about the cause has changed.

The signal that matters is [memory pressure](https://macmelon.com/glossary/memory-pressure): whether macOS is struggling to find room for what is running. When pressure stays high, macOS writes memory out to [swap](https://macmelon.com/glossary/swap-memory), and you feel the pause when it reads it back. Sentinely starts there. If pressure is fine, it tells you your Mac is fine, and keeps watch.

## Fix the cause, not the number

When pressure is high, something specific is usually holding memory you are not using. Slack open for a week. MCP servers left running after the AI tool that started them closed. A language server in your editor that grew all afternoon. A model still loaded in Ollama. Adobe helpers with no Adobe app open.

Each of those has a real fix, and each fix has a cost: a chat app restarts, autocomplete pauses for a few seconds, a model loads again on the next request. Sentinely shows you the fix and its cost before anything happens, and re-checks each process just before it acts. Apps quit the normal way, so they can save your work. It only touches your own processes.

## Count with the right number

macOS keeps more than one number per process. Resident size, often called RSS, leaves out compressed memory and counts shared pages in every process that uses them. Sentinely estimates with the [memory footprint](https://macmelon.com/glossary/memory-footprint), the number macOS itself charges to a process, including what it has compressed.

Even that is not exact for apps built from many processes, because they share memory. So those estimates say “up to”. We would rather show a careful estimate than a confident wrong one.

## Measure afterwards, and say so when it did not help

Every fix ends with a [measured receipt](https://macmelon.com/glossary/measured-receipt). Freed is the footprint of the processes that are now gone, measured ten seconds after the fix and confirmed at one minute. Felt is what changed for you: memory pressure, and how often the Mac reads memory back from swap, before and after.

Sometimes the answer is “not much”. The receipt says that too. It never turns a result into minutes saved or a percentage faster, because we cannot measure those honestly. Your lifetime totals add up only bytes that were measured.

## What we will not do

No freezing apps behind your back. No admin password or kernel tricks. No restart advice because your Mac has been on for a while; Sentinely only suggests a restart when pressure stays high after everything it can fix has been dealt with and swap is still very large. And no reading of secrets: command lines, which can contain API keys and tokens, are redacted on the Mac before the rest of the app sees them, and are never stored or sent.

The full method, including its limits, is on [How Sentinely measures](https://macmelon.com/how-sentinely-measures). If you want to check your own Mac without any app, the guide [How to find what’s slowing down your Mac](https://macmelon.com/guides/how-to-find-what-is-slowing-down-your-mac) walks through Activity Monitor step by step.

## Apps

[### Sentinely](https://macmelon.com/apps/sentinely)

## 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)[### When Slack, Teams, or Discord slows your Mac](https://macmelon.com/use-cases/slack-teams-and-discord-slowing-your-mac)

## Related terms

[### Memory pressure](https://macmelon.com/glossary/memory-pressure)[### Memory footprint](https://macmelon.com/glossary/memory-footprint)[### Measured receipt](https://macmelon.com/glossary/measured-receipt)[### Swap](https://macmelon.com/glossary/swap-memory)