# UltimaDark - The Fastest Dark Mode Extension

> UltimaDark uses agressive and smart techniques to turn even the sunniest websites into realms of darkness. Although it works well, this is so experimental, it makes lab rats look like seasoned professionals. Go ahead, embrace the shadows! 🦇

Canonical page: [https://chrome-stats.com/d/ultimadark](https://chrome-stats.com/d/ultimadark)

## Overview

- **ID:** `ultimadark`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** ThomazPom
- **Category:** appearance
- **Daily users:** 2,796
- **Weekly downloads:** 114
- **Rating:** 4.45 / 5 (102 ratings)
- **Version:** 1.6.73
- **Last updated:** 2026-08-02
- **First published:** 2020-05-27
- **Size:** 3.41 MB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/ultimadark/)
- **Website:** [https://github.com/ThomazPom/Moz-Ext-UltimaDark](https://github.com/ThomazPom/Moz-Ext-UltimaDark)

## Description

UltimaDark is a high-performance Chrome extension that uses aggressive and intelligent techniques to convert even the brightest websites into dark, readable themes. It applies smart color transformations, selective image handling, and contrast adjustments to preserve visual clarity while minimizing glare. Built for speed, UltimaDark aims to load quickly and keep CPU impact low so night browsing stays smooth.

Experimental by nature, UltimaDark includes per-site controls, whitelist/blacklist options, keyboard shortcuts, and theme presets. Advanced settings let you tweak inversion strength, protect images and logos, or enable selective filters for better compatibility. Embrace the shadows and transform sunny websites into comfortable, distraction-free dark experiences.

## Rankings

- #1,749 — Overall
- #280 — Appearance
- #2 — fastest way
- #33 — radar
- #36 — dark mode
- #40 — fast vpn

## Permissions and access

### Permissions

- `<all_urls>`
- `tabs`
- `browsingData`
- `webNavigation`
- `webRequest`
- `webRequestBlocking`
- `storage`
- `unlimitedStorage`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

UltimaDark is fast and lightweight with easy per-site exclusions and a modern UI, performing well across many sites and even benefiting OLED users. However, reliability varies on some sites (garbling or slow loading), and update-related bugs and settings loss are common. Platform compatibility issues (notably on Android) and occasional breakages after updates also affect consistency.

### Pros

- Very fast and efficient; significantly faster than Dark Reader with low performance impact.
- Easy per-site exclusions and adjustable darkness settings.
- Works well across many sites and handles progressively loaded content better.
- Lightweight with a modern, user-friendly UI that simplifies setup.
- Works better for OLED displays (great for OLED users).

### Cons

- Some websites render poorly or fail to load (e.g., YouTube loading issues, IMDb garbled on Android, white-on-white text on certain pages).

## Similar extensions and apps

- [NightShift - ExtensionBuffet](https://chrome-stats.com/d/nightshift-extensionbuffet) — 3 users
- [Dark Mode Reader](https://chrome-stats.com/d/dark-mode-reader) — 3 users
- [AuraDark: E-Paper & Dark Mode](https://chrome-stats.com/d/auradark-e-paper-dark-mode) — 1 users
- [Dark Mode Bang](https://chrome-stats.com/d/dark-mode-bang) — 1 users
- [Everything Dark](https://chrome-stats.com/d/everything-dark) — 1 users
- [Ultra Dark](https://chrome-stats.com/d/sombre-artcas2) — 4,451 users, 4.82 / 5
- [Dark Days](https://chrome-stats.com/d/dark-days)
- [Dark Mode AI](https://chrome-stats.com/d/dark-mode-ai) — 1 users
- [This extension lets](https://chrome-stats.com/d/this-extension-lets)
- [Page Shadow](https://chrome-stats.com/d/page-shadow) — 243 users, 4.33 / 5
- [Dark Ritual (dark theme)](https://chrome-stats.com/d/dark-ritual-dark-theme) — 6 users
- [DarkVision - Smart Dark Mode](https://chrome-stats.com/d/darkvision-smart-dark-mode) — 6 users

---

Source: [Chrome-Stats](https://chrome-stats.com/d/ultimadark)