Both are free dark mode Chrome extensions. They solve the same problem differently. Here's exactly how they compare.
| Feature | NightShift | Dark Reader |
|---|---|---|
| Price | Free | Free (donations) |
| Chrome Web Store | Yes (pending) | Yes |
| Extension size | Lightweight | ~1MB |
| Dark mode method | CSS filter + smart invert | Dynamic theme (rewrites page CSS) |
| Per-site on/off | ✓ | ✓ |
| Per-site custom CSS | ✓ | ✓ |
| Presets | ✓ 4 built-in (Midnight, Dusk, Hacker, Paper) | ✓ up to 4 custom themes (since v4.9.16) |
| Brightness control | ✓ | ✓ |
| Contrast control | ✓ | ✓ |
| Sepia filter | ✓ | ✓ |
| Blue light filter | ✓ | Sepia slider (no dedicated toggle) |
| Smart invert | ✓ | ✗ |
| Reading mode | ✓ | ✗ |
| Auto-schedule (sunrise/sunset) | ✓ | ✓ |
| Custom schedule | ✓ | ✓ |
| Keyboard shortcut | ✓ | ✓ |
| CPU impact | Low | Medium–High (dynamic theme recalculates on every page) |
| Manifest version | MV3 | MV3 |
| Analytics / tracking | None | None |
| Open source | ✗ | ✓ |
NightShift applies CSS filters and inversion at the document level, with overrides stored per site. The approach is fundamentally simple: one stylesheet transform, applied globally, with targeted exceptions. That keeps CPU usage low and rendering predictable — NightShift doesn't touch the page's own stylesheets at all, so layout stays intact.
Dark Reader uses a dynamic theming engine that parses and rewrites page stylesheets in real time, attempting to derive appropriate dark colors for every element it finds. The result is more thorough coverage in theory, but the cost is significant: heavier memory footprint, noticeable CPU usage while the theme calculates, and a tendency to cause layout flickering or visual glitches on pages with complex CSS. Every navigation loads triggers the engine again.
Both extensions support per-site custom CSS. NightShift's implementation is built into the popup — open it, scope to the current site, write your rules. Dark Reader added per-site CSS in v4.6.0 via its Developer Tools panel, which requires switching to Static mode first. NightShift's approach is more accessible; Dark Reader's is there if you know where to find it.
NightShift ships with four named presets — Midnight, Dusk, Hacker, and Paper — each tuned for a specific use case. One click applies the full preset: brightness, contrast, invert, and filter settings in one shot. Dark Reader added custom theme support in v4.9.16: you can create up to 4 named themes and assign them to site groups. It's more flexible in configuration but requires manual setup; NightShift's presets are ready out of the box.
NightShift includes a reading mode that strips page clutter — sidebars, ads, nav elements, non-article content — and reformats the main article text into a clean, centered reading view at a comfortable line width with increased line height. It's built for long-form reading without the distraction of surrounding page elements. Dark Reader has no equivalent: its scope is limited to color transformation, with no layout or typography controls.
Both extensions now run on Manifest V3. NightShift was built on MV3 from the start. Dark Reader completed its MV3 migration after a long process — Chrome dropped MV2 support in stable channel builds (Chrome 138, July 2025), so the transition was a hard requirement. Both extensions are in good standing on the current platform standard.