An honest look at Caffeine, PowerToys Awake, Don't Sleep and StayGreen — and the one thing they all leave to your memory. PowerDoze closes that gap: it reads four signals, decides for you, and gets out of the way.
You searched for a way to stop Windows going to sleep. Every tool below does that. The real question is the next one: who turns it back off? Caffeine, PowerToys Awake and Don't Sleep keep your PC awake until you remember to flip the switch — leave it on and your machine never sleeps again, burning power all night. That gap is the whole reason PowerDoze exists: it keeps the screen awake while the app that needs it is running, then releases on its own — and it does the same trick for power modes, Wi-Fi location and battery, with a report of what you saved.
| Feature | Caffeine | PowerToys Awake | Don't Sleep | StayGreen | PowerDoze |
|---|---|---|---|---|---|
| Prevent system sleep | ✓ | ✓ | ✓ | ✓ | ✓ |
| Keep the display on too | — | ✓ | ✓ | ✓ | ✓ |
| Auto-release when the trigger ends | CLI | CLI | — | ✓ | ✓ |
| Time-of-day schedule (GUI) | CLI | — | ✓ | — | ✓ |
| Foreground-app auto trigger | CLI | CLI | — | ✓ | ✓ |
| Idle / away detection | — | — | — | — | ✓ |
| Wi-Fi location profiles | — | — | — | — | ✓ |
| Battery-aware policy | -onac | — | ✓ | ✓ | ✓ |
| Switch Windows power mode | — | — | — | — | ✓ |
| Thermal auto-pause | — | — | — | ✓ | — |
| Power savings report (kWh / cost) | — | — | — | — | ✓ |
| Away auto-dim / lock | — | — | — | — | ✓ |
| Price | Free | Free | Free | ~US$3–5 | Free + Pro |
| Open source | — | MIT | — | — | — |
“CLI” = possible only via command-line flags, no GUI. Facts checked against each tool's official docs (2026); StayGreen price is a Microsoft Store promo and may change.
The featherweight classic: a ~300KB portable app that taps a phantom key (F15) every 59 seconds so Windows thinks you're still there. It's free and needs no admin. It has surprisingly powerful command-line flags — -activeperiods for time windows, -watchwindow to only run when a given window is open — but they're CLI-only, set per launch, with no GUI. It also doesn't keep the display on (system only), and the default F15 trips up some apps.
Best for: people who want the absolute lightest thing and are comfortable with command-line switches.
The official, free, open-source (MIT) option, bundled with PowerToys. Clean modes: keep awake indefinitely, for a set duration, or until a date/time — with an optional “keep screen on” and a --pid flag to exit when a process ends. Its one documented wall: it stops working on the lock screen. Microsoft's own docs say so, and tell you to change your Windows power plan instead for that case. No daily schedule, no Wi-Fi, no power-mode switching, no report.
Best for: occasionally blocking sleep on an unlocked PC. Honestly — if that's all you need, use PowerToys Awake. It's free and official; you don't need us — but if you reach for it every day, or you keep forgetting to switch it back, that's the exact gap PowerDoze closes: it keeps the screen awake only while the app needs it, then lets the PC sleep on its own.
The most feature-rich of the keep-awake crowd: it blocks shutdown, standby, hibernate, log-off and the screensaver, with timers and conditions — release when battery drops below X%, when CPU or network load is low, or at a set time. Free, portable, 40+ languages. But it's still “advanced manual blocking + conditions to let it sleep,” not context-driven automation — and it doesn't change your power plan or report anything. The UI is dense and engineer-flavoured.
Best for: power users who want fine-grained control over when it's allowed to sleep.
The smartest single-signal tool here: a Microsoft Store app (~US$3–5 one-time, no subscription) that keeps the PC awake only while a chosen app is in the foreground, pauses on unplug/lid-close, and adds genuine thermal protection (auto-pause so a laptop doesn't cook in a bag) using event-driven hooks at 0% CPU. Credit where due: its per-app trigger and thermal pause are real, and PowerDoze doesn't do the thermal piece. What it doesn't have: time schedules, Wi-Fi location, power-mode switching, or any savings report.
Best for: “don't sleep while this one app runs” plus laptop overheating worries.
Here's the pattern: every tool above is a keep-awake switch — manual, or watching a single signal. PowerDoze is a different category — multi-signal power automation. It doesn't just block sleep; it runs your whole power behaviour by context and then automatically steps back, so you stop being the switch:
Because honesty is the point of this page:
The lock screen runs in a separate secure session, and a normal user-mode app can't hold a power request there — Microsoft documents this and suggests changing your power plan instead. PowerDoze's background engine keeps running while locked, so its rules still apply.
PowerDoze is free to use too. Only the context add-ons (Wi-Fi location, meeting detection, away dim/lock, savings analytics) are a one-time Pro purchase — no subscription. If you only need a manual keep-awake switch, the free tools are great; we're for people tired of being the switch.
Honestly, PowerToys Awake or Caffeine. They're free and do exactly that. PowerDoze earns its keep when you want it to decide automatically and switch power behaviour by context, not when you want one manual toggle.
Only while the trigger lasts. Its app whitelist keeps the machine awake while that app runs and restores normal sleep automatically when it closes — that's the whole point.
Any of these tools beats a physical jiggler — they declare a real power request to Windows instead of faking input. PowerDoze (or PowerToys Awake, for the manual case) does it cleanly with no phantom mouse movement.
Want one manual toggle? PowerToys Awake. The lightest CLI option? Caffeine. Fine-grained "when may it sleep" control? Don't Sleep. Per-app keep-awake plus thermal protection? StayGreen — each is good at its one thing. But if you're done being the thing that remembers to switch power settings on and off, PowerDoze is the only one here built to do it for you — automatically, on four signals, and it shows you what it saved.
Want the full landscape — including Process Lasso, ThrottleStop and vendor tools? Read the complete Windows power-tools guide →