Any MacBook, no notch needed
Always in view, as a thin line around your notch.
16 GB installed · 7.9 GB moved to disk. Safari holds a lot, but most of it is parked.
Under 10% free, what is left of the bar on the notch turns orange.
On a phone hotspot with a data plan set, the notch shows how much of the plan is used.
Read from files Claude Code and Codex write on your Mac. Your logins are never touched.
The battery always fills from the left. Add four dots in the middle and a bar on the right, and pick what each one shows: memory, storage, data or your AI limit. Like the battery, the dots and the bar show what is left, and turn orange when something is running out.
The whole notch is your battery gauge.
Battery on the left, one more gauge on the right.
Three readings at a glance, each with its own panel.
On a MacBook without a notch, the same line becomes a small ring beside your clock: battery down the left, your bar down the right, the dots at the bottom. Click it for the same panels.
An app can claim far more memory than your Mac has. Drain shows what each one really keeps in memory right now, apart from what macOS has squeezed or moved to disk, and tells you when macOS itself says memory is tight.
Free space on the notch, a chart that shows a download or a cleanup as it happens, and your biggest apps. Drain measures the Applications folders only and never looks into your files.
On Wi-Fi the notch shows signal strength. On a phone hotspot, set your plan's size and it shows how much of it this Mac has used. The panel adds live speed and the data each app used today, this week or since you reset the counter.
See how much of your Claude Code and Codex limits is used, and when they reset, before you hit the wall mid-task. Drain reads the figures those tools write on your Mac, as of the last time you used them.
Every gauge comes with its own tally. Battery: what each app, project and part of your Mac has cost since you unplugged, down to the screen, the speakers and charging heat, measured on your own Mac. Memory: what each app really keeps in memory, apart from what macOS has parked. Data: what each app used today, this week or since you reset the counter. Storage: your biggest apps.
Solid: used so far, or in memory now. Faded: what it's using right now, or what macOS has parked.
Drain names what is using each thing in words you recognize: a script by its project and command, a browser as one app instead of twenty helpers. Hover a name for its folder, what started it and when. And it shows your AI limits, which no macOS tool shows at all.
What you see when you hover the name. ⚠ means what started it has closed, so nothing else will stop it: the Stop button is right there.
Everything stays white until something needs you. Then the part that is running out turns orange, on the line and beside the notch.
A paused video can keep the speakers on for hours, and your Mac won't sleep while it does. Drain tells you which browser, and suggests which of your open sites is likely doing it.
When an app you can quit keeps using a lot of power for a minute, its icon appears beside the notch with a warning. Several stack up. Never for parts of macOS you can't stop.
See the charger's name, how much it delivers, how much your Mac uses and what goes into the battery. If a cable or a shared charger holds it back, or smart charging is holding the battery, Drain says so.
When your Mac gets hot and starts slowing down, or the battery heats up, a warning appears under the chart, with a tip like "try a hard surface".
Turn Low Power Mode on or off from the panel. A yellow leaf beside the notch shows when it's on.
When a video or game goes fullscreen, even in players like VLC, the line around the notch dims. Or hides completely, if you prefer.
Under 10% free, what is left of the storage bar and its label turn orange. The panel shows free space falling as a download runs, and which apps take the most room.
When macOS itself says memory is tight, the memory mark turns yellow, then orange when it's critical. The panel shows which apps really occupy your memory, not the inflated figures.
Past 90% of your Claude or Codex limit, the bar and the figure turn orange, with the time until it resets one hover away. Better to know before you start a long task.
Buy a license and use it. There's nothing to sign in to. The license is checked with our payment provider when you activate it, then about once a month.
Drain doesn't report what you run, when, or for how long.
Claude and Codex limits come from files those tools write on your Mac. Drain never reads or uses your logins, and nothing is sent anywhere.
Browser tabs are checked only while a browser keeps the speakers on. Only the names of media sites are kept, in memory, and never saved.
For the first 1,000 licenses. Then $9.
10 %/h reads as roughly ten hours of battery. Watts are one click away if you prefer them.
From your Mac. Battery: per-process energy counters, the chip's energy counters and the power controller's sensors. Memory, storage and data: the same counters macOS keeps for its own tools. The screen, speakers and keyboard light are measured once with a short test that tells you exactly what it will do before it starts. Charging heat is learned each time you plug in or unplug, and the figures keep adjusting as you use your Mac.
They are as of the last time each tool ran in a terminal, and the panel says how long ago that was. For Claude, Drain adds a small status line to Claude Code with your say-so; you can remove it in one click.
The same gauges and the same panels, from a ring icon in the menu bar. Only the labels beside the notch have no equivalent there.
On ordinary Wi-Fi it shows signal strength. On a phone hotspot with a plan size set, it shows how much of the plan this Mac has used. It can't see what your phone itself uses.
Only while a browser keeps the speakers on, Drain looks at your open tabs for sites that usually cause it, like YouTube or X. Everything else is dropped right away and nothing is saved.