Alternatives to Turn Off the Lights
Dims everything around a video and adds a site-wide dark mode. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Turn Off the Lights
Dims everything around a video and adds a site-wide dark mode.
Replacements
Listings that take over the same core job as Turn Off the Lights.
Dark Reader
Generates a dark theme for every website, on the fly.
Dark Reader is open source under MIT and generates dark themes for every site with per-site settings, but has no video dimming, volume, speed or screenshot controls.
Night Eye
Dark mode extension that converts pages locally while preserving colours.
Night Eye converts pages to dark mode locally while preserving colours, but free use is limited and continued use needs a subscription or lifetime licence; there is no video dimming.
Noir
Adds dark mode to every website in Safari to reduce eye strain and save battery.
Noir is a paid dark mode app for Safari on macOS and iOS rather than a browser extension, and it has no cinema dimming or video controls.
Also worth comparing
These listings name Turn Off the Lights as their own alternative, so the relationship runs both ways.
Video Speed Controller
A browser extension that adds keyboard shortcuts to speed up, slow down and rewind HTML5 video.
Turn Off the Lights adds speed, volume and screenshot controls alongside video dimming and a site-wide dark mode, though its options page is cluttered.
Similar software
Related functionality, not a direct replacement.
Picture-in-Picture
Browser extension that pops video out into a floating, always-on-top window.
High Contrast
Browser extension that boosts page contrast for easier reading.
Stylus
Applies custom CSS user styles to any website.
Stylebot
Changes how a website looks without writing CSS.
Enhancer for YouTube
Browser extension that adds playback speed, quality, volume and codec controls to YouTube.