Accessibility & ComfortFreeNew4.8 out of 5, editor score

NightOwl – Dark Mode & Eye Guard

Free Chrome extension by AltFTool

Dark mode + eye protection in one. Invert colors, adjust brightness, and apply warm/cool screen tints.

Add to Chrome (opens Chrome Web Store)

Editor score is the AltFTool team’s own rating, not user reviews.

NightOwl – Dark Mode & Eye Guard preview

Features

What NightOwl – Dark Mode & Eye Guard does

  • Enable dark mode on any website

  • Reduce eye strain with adjustable brightness

  • Apply warm and cool color filters for better comfort

  • Quick toggle from popup interface

  • Lightweight and fast performance

Install

How to install NightOwl – Dark Mode & Eye Guard

  1. Step 1: Open the extension's page on AltFTool and choose “Add to Chrome”. The official Chrome Web Store listing opens in a new tab.

  2. Step 2: On the store listing, check the developer, the description and the permissions the extension asks for.

  3. Step 3: Click “Add to Chrome”, read the permission prompt Chrome shows, then confirm with “Add extension”.

  4. Step 4: Pin it. Open the puzzle-piece Extensions menu next to the address bar and click the pin icon so it stays one click away.

Using Edge, Brave or Opera?

  • Microsoft Edge, Brave, Opera and Vivaldi are built on Chromium and can install most Chrome Web Store extensions.
  • In Edge, open the store listing and allow “extensions from other stores” when Edge asks, then click “Get” / “Add to Chrome”.
  • Firefox and Safari use a different extension format, so Chrome Web Store items do not install there.

Permissions & privacy

What it can access

Check before you install

Chrome shows the exact permissions NightOwl – Dark Mode & Eye Guard asks for before you confirm the install. You can also read them, and the developer’s data declarations, in the Privacy practices section of the store listing.

Explain permissions with the free analyzer

Extension safety checklist

  • Read the permissions. “Read and change all your data on all websites” is powerful. Prefer extensions that only ask for what their job needs, such as activeTab or storage.
  • Check the developer and privacy tab. Every Chrome Web Store listing has a Privacy practices section where the developer declares what data, if any, is collected.
  • Install from the official store. Avoid .crx files from random download sites. Our pages only link to the official Chrome Web Store listing.
  • Prune what you don't use. Every extension adds a little start-up and memory cost. Remove the ones you haven't opened in a month from chrome://extensions.

FAQ

NightOwl – Dark Mode & Eye Guard questions

Is NightOwl – Dark Mode & Eye Guard free?

Yes. NightOwl – Dark Mode & Eye Guard is a free Chrome extension from AltFTool and does not need an AltFTool account.

How do I install NightOwl – Dark Mode & Eye Guard?

Choose “Add to Chrome” on this page to open the official Chrome Web Store listing, review the permissions, then click “Add extension” and pin it from the Extensions menu.

Does NightOwl – Dark Mode & Eye Guard work in Edge or Brave?

NightOwl – Dark Mode & Eye Guard is built for Google Chrome. Chromium-based browsers such as Microsoft Edge, Brave and Opera can usually install Chrome Web Store extensions too; Firefox and Safari cannot.

What can NightOwl – Dark Mode & Eye Guard do?

Enable dark mode on any website; Reduce eye strain with adjustable brightness; Apply warm and cool color filters for better comfort; Quick toggle from popup interface.

What permissions does NightOwl – Dark Mode & Eye Guard need?

Chrome shows the exact permissions before you confirm the install, and the store listing shows them too. Paste them into AltFTool's Browser Extension Permission Analyzer for a plain-English explanation.

Get NightOwl – Dark Mode & Eye Guard for Chrome

Free, no AltFTool account needed. Installs from the official Chrome Web Store.

Add to Chrome (opens Chrome Web Store)Browse all extensions

NightOwl – Dark Mode & Eye Guard

Add to Chrome (opens Chrome Web Store)