Your computer keeps falling asleep.
Zzz keeps it awake.

Use it right here in your browser — no download needed. Or grab the desktop app for your menu bar.

Your screen is sleeping

Keep this tab open · Works in Chrome, Edge, Safari · Free

or download the desktop app
🛏️ Buy me a pillow

v1.0 · Free · Lightweight

What it does

One switch between awake and asleep.

Zzz sends a single harmless keypress every few minutes — the same trick as classic tools like Caffeine — so your machine thinks you're still there.

Stays awake

No sleep, no dimming, no screensaver, no idle screen lock — for as long as you leave it on.

One click on/off

Lives in your menu bar / system tray. Click to toggle. The icon glows when it's keeping you awake.

Your interval

Pick how often it nudges — roughly every 2, 3–4, or 5 minutes. A little randomness keeps it natural.

How it works

Running in about a minute.

1

Download & open

Grab the build for your system and launch it. On macOS, allow the Accessibility permission when prompted.

2

Find the tray icon

Zzz tucks itself into your menu bar (Mac) or system tray (Windows). No window, no clutter.

3

Toggle & forget

Click to switch on. Your screen stays awake until you turn it off or quit. That's it.

Good to know

Questions, answered straight.

Do I need to download anything?
No. Click "Keep Awake" on this page and your screen stays on — no installation, no account, nothing to download. It uses a standard feature built into modern browsers. The desktop app is an optional alternative if you prefer a tray icon.
Is it safe? What is it actually doing?
Zzz sends a small, harmless background signal every few minutes — just enough to reset your system's idle timer. It doesn't type, click, or move anything visible. No account, no tracking, no data leaves your machine.
Will it work on my work / company laptop?
Often not. Managed devices (with MDM, Intune, or group policy) can enforce screen lock in ways a keypress can't reset, and IT can see and block apps like this. Zzz is built for your own computer — presentations, downloads, reading, monitoring. Please don't use it to get around your employer's security policy.
Why does macOS ask for an Accessibility permission?
Zzz needs to interact with system-level settings to prevent sleep, so macOS requires you to grant access under Settings → Privacy & Security → Accessibility. Without it, Zzz runs but won't be able to keep your screen awake.
Why does my browser warn me when I open it?
The first builds aren't code-signed yet, so Windows SmartScreen or macOS Gatekeeper may show a warning. On Windows: More info → Run anyway. On macOS: right-click → Open.
How much does it cost?
Nothing — Zzz is free. If it saves you the annoyance of a locked screen, a small donation helps keep it maintained. Entirely optional.