How is NoSleep different from desktop apps like Caffeine?

NoSleep requires no download or installation and works directly in your browser across Mac, Windows, and mobile. Desktop apps need installation and typically support only one OS—NoSleep is lighter and more convenient.

How does the timer feature work?

Click the "Timer" button to set 1-480 minutes. When time expires, the wake lock auto-releases and your device returns to normal sleep settings. Perfect for downloads, focus sessions, or timed tasks—cancel anytime if needed.

Why is the floating window recommended?

The floating window stays on top and syncs with the main page, so it won't accidentally hide when you switch tabs or apps. More reliable than keeping the main tab open, and convenient for controlling wake state during multitasking.

Is NoSleep safe and privacy-friendly?

Completely safe. It only uses the standard browser Screen Wake Lock API, with no access to files, camera, mic, or personal data. No data is collected or transmitted—functionally equivalent to moving your mouse periodically to prevent sleep.

NoSleep

Free web-based tool to prevent screen sleep and timeout. Set custom timers (1-480 min) for downloads, presentations, and long tasks. Works instantly in Chrome, Safari, Edge—no installation. Cross-platform: Mac, Windows, mobile.

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Summary

NoSleep is a free browser-based screen wake tool that prevents your computer or phone from sleeping with one click. No download required—works directly in Chrome, Safari, Edge, and other browsers. Features custom timers (1-480 minutes) and a floating window, ideal for downloads, presentations, video rendering, and other long-running tasks.

What is NoSleep?

NoSleep is a web application built on the browser's Screen Wake Lock API, using standard web technology to prevent devices from entering sleep mode. Users activate the wake lock by clicking a button, optionally set an auto-release timer, or open an always-on-top floating window to maintain functionality while switching tabs. Completely free, ad-free, collects no personal data, and supports Mac, Windows, Chromebook, Linux, iPhone, and Android.

Core Capabilities

One-click wake lock — Prevent screen sleep instantly without installing software
Custom timers — Set 1-480 minute auto-release for tasks of varying length
Floating window — Always-on-top popup syncs with main page, unaffected by tab switching
Cross-platform support — Chrome 84+, Edge 84+, Safari 16.4+, Firefox (with setup)
Real-time status — Sun/moon animated icons show current wake state
Privacy-safe — Uses only standard Web APIs, no access to files, camera, mic, or personal data

Pros

No download or installation—open the page and use, more convenient than desktop apps (Caffeine, Amphetamine)
Completely free with no ads, sign-ups, or hidden costs
Universal across devices—works on Mac, Windows, and mobile browsers
Timer auto-releases to avoid battery drain from forgetting to turn off
Floating window design keeps controls visible during multitasking

Positioning & best fit

NoSleep is designed for users who need to temporarily prevent screen sleep, replacing traditional desktop apps with a lighter, cross-platform solution. Ideal for scenarios where you don't want to install extra software but need the screen to stay on during specific tasks.

Remote workers & students — Online meetings, presentations, long reading sessions without screen lock
Developers & creators — Code compilation, video rendering, AI-assisted development (e.g., Claude Code) and other long processes
Data monitoring staff — Real-time dashboards and system monitoring tools requiring continuous display
General users — Large file downloads, live streaming, idle gaming, and everyday scenarios needing device wake