What each view actually shows, how to measure one specific thing, and how to tell whether your Mac is genuinely under memory pressure or just has a lot of RAM in use.
Seven ways to look at the same underlying measurements — pick the one that answers the question you actually have.
Start here. Everything currently running, grouped into categories (Browsers, AI Tools, Developer Tools, and more), plus which apps have moved the most over the last 15–60 minutes.
Individual moments memory jumped a lot, one at a time, with an honest confidence level — never a guess dressed up as certainty.
The heaviest apps right now, as continuous lines over the last 30 minutes to 2 hours. The shape of the trend, not a single number.
Day, week, and month rollups. This is how you tell a one-off spike from an app that's chronically heavy every single day.
Start a session, do the one thing you're curious about, stop — see exactly how much memory that specific action cost, isolated from everything else running.
A live, sorted ranking of every app by current memory footprint. The most direct answer to "what's using my RAM right now?"
Trying to figure out whether one particular action — opening a huge spreadsheet, starting a video call, exporting a project — is really what's costing you memory?
Open the Check one action tab, hit Start, do the thing, hit Stop. Memory Story measures your Mac's memory immediately before and immediately after, and reports the real delta for that specific window — not a rough before/after glance at Activity Monitor, and not affected by whatever else happened to be running at the same time.
"12 GB free" and "under memory pressure" are not the same thing — and pressure is what actually predicts whether your Mac is about to feel slow.
macOS itself tracks a memory pressure level, and it's a better signal than raw free RAM: your Mac can show plenty of "used" memory from normal caching and still feel completely fine, or show a lot of "free" memory right up until it doesn't. Memory Story reads that same signal the OS uses internally, not an approximation.
No overall memory stress. Everything has the headroom it needs.
Apps may start to feel slower. Worth noticing which app is heaviest right now.
Your Mac is actively struggling. Closing a heavy app helps immediately.
This shows at the top of Stories, in Overview, and — the one you'll actually notice in the moment — the floating widget turns red and forces itself open the instant your Mac has 5% or less memory free, whether or not you happen to be looking at Memory Story at the time.
A small always-on-top card, or a bar docked to a screen edge, so you don't need the main window open to keep an eye on things.
Shows the app you're focused on, its trend, and total system memory. Pin it to a specific app instead of following focus, dock it to the top or bottom of the screen (it collapses to a thin handle until you hover), or keep it floating and snap it to a corner. ⌘⇧W toggles it from anywhere.
Want to actually free up memory, not just look at it?
Read the tips guide