Caspian is a lightweight, privacy-focused productivity tool available as desktop extensions (for Chromium and Mozilla Firefox) and native Android companion applications (Caspian Flow & Caspian Mobile).
It addresses everyday web performance and workflow friction: eliminating typing lag in long AI conversations via real-time DOM pruning, providing universal playback speed control across all media sites, cleaning up your YouTube homepage with quick feed limits and 1-click "Not interested" actions, converting temporary chats to permanent history, and exporting conversation transcripts to clean, publication-ready formats.
| Desktop Extensions (Chromium & Firefox) | Caspian Flow / Mobile (Android) | Automatic Updates (Obtainium) |
|---|---|---|
| Chromium (V6.3.0) & Firefox (V6.3.0 MV3) | Floating Action Pod & Bottom Sheet UI | One-click app updates via GitHub Releases |
| ChatGPT, Google Gemini, YouTube, Media | Omnibox Multi-Tab Browser & AI Docks | Import configuration file included in repo |
| DOM Pruner, Flow Speed, RippleFrame, Exporters | Zero-Lag DOM Pruning & Video Remote | Background update notifications & installs |
Capture seamless full-length screenshots of any webpage and open them in an interactive editing studio tab:
- Progressive Full-Page Capture: Scrolls through the active page smoothly while freezing sticky headers to prevent duplicate navigation bars.
- Interactive Crop Tool: Rectangular crop box with 8-point drag handles and instant canvas resize.
- Privacy Redaction & Blur: Pixelate or blur sensitive passwords, emails, and tokens with an interactive box brush.
- Blackout & Hide Boxes: Draw solid opaque rectangles for confidential document redaction.
- Vector Annotations: Freehand pen, highlighters, directional vector arrows, rectangle/circle outlines, and text tags.
- Multi-Format High-Res Exporter: Export edited captures to
PNG,JPG / JPEG(with compression quality slider), or cleanPDFdocuments with custom names and location prompts.
Long conversation threads on ChatGPT and Google Gemini often introduce severe typing latency, frame drops, and browser memory bloat due to thousands of rendered DOM elements. Caspian dynamically virtualizes offscreen conversation messages from the active viewport using lightweight CSS rules. Typing lag is eliminated immediately while 100% of your chat history remains intact in memory.
A clean, system-wide media rate controller that works on <video> and <audio> elements across any website (YouTube, Netflix, Twitch, Coursera, Udemy, Vimeo, and embedded players):
- Precision Speed Control: Adjust playback speed continuously from
0.25xto5.0xor use instant preset pills. - Smart A/B Toggle (Alt + S): Switches between
1.00xand your last active custom speed (e.g.1.75x) with a single keypress. - Speed Cycle (Alt + D): Rotates through a customizable comma-separated list of speeds (e.g.
1, 1.25, 1.5, 1.75, 2, 2.5, 3). - Fine Adjustment (] / [): Step up or down by
0.25x. - Left-Side Speed HUD: A floating glassmorphic badge with a wave indicator appears on screen when shortcuts are pressed.
- Toolbar Icon Speed Badge: Live speed badge on the extension icon with an ON/OFF toggle in settings.
- Input Protection: Automatically disables shortcuts when typing inside search inputs, comment boxes, or editors.
- Feed Limit Control: Limit the number of videos displayed on your YouTube homepage (in neat multiples of 3:
3,6,9,12,15,18,21,24,30, or∞ All). - 1-Click "Not Interested" Button: Hovering over any video thumbnail reveals an instant "Not interested" button at the top-left, automatically triggering YouTube's native feedback menu without requiring extra clicks.
Export both normal and temporary conversations from ChatGPT and Google Gemini into five clean formats:
- Styled PDF / HTML: Formatted document with KaTeX LaTeX math equations, language-tagged syntax-highlighted code blocks, tables, and conversation badges.
- Markdown (
.md): Full Markdown transcripts with headers and code fences. - Plain Text (
.txt): Clean structured plain text logs. - Microsoft Word / Google Docs (
.doc): Editable structured document outlines. - Clipboard Copy: Instant 1-click transcript copying.
Detects active temporary or guest chat sessions in ChatGPT and Gemini, allowing you to convert them into permanent account history before they disappear.
Easily backup all your theme accents, chat limits, YouTube preferences, and Flow Speed hotkeys to a .json file, and restore them instantly on another browser or device.
- Chromium Browsers: Google Chrome, Microsoft Edge, Brave, Opera, Vivaldi, Arc, and other Chromium-based browsers.
- Mozilla Firefox: Firefox Desktop (Standard, Developer Edition, Nightly, Floorp, Zen) via
about:debugging.
- Download the latest release archive (
Caspian-Extension-v6.3.0.zip) from the GitHub Releases Page. - Unzip the downloaded file to a local folder (or use the
Caspianfolder in the repository). - Open your browser and go to the extensions management page:
- Chrome:
chrome://extensions - Edge:
edge://extensions - Brave:
brave://extensions
- Chrome:
- Enable Developer mode (toggle in the top-right corner).
- Click Load unpacked and select the unzipped
Caspianfolder. - Pin Caspian to your toolbar for quick access.
- Download the latest release archive (
Caspian-Fox-Extension-v6.3.0.zip) from the GitHub Releases Page (or locate thecaspian fox extensionfolder in the repository). - Unzip the downloaded file (if needed).
- Open Firefox and navigate to:
about:debugging#/runtime/this-firefox - Click Load Temporary Add-on...
- Select
manifest.jsoninside the unzippedcaspian fox extensionfolder (or selectCaspian-Fox-Extension-v6.3.0.zip). - Pin Caspian to your Firefox toolbar for quick access.
- Integrated Service Hub: Switch seamlessly between ChatGPT, Google Gemini, Google Search, and YouTube.
- Floating Docks:
- ChatGPT & Gemini Docks: Reload triggers, turn navigators, and pruning limits.
- YouTube Floating Remote: Custom glass dropdowns for playback speed (
0.25xto2.0x) and video quality. - Google Search Dock: Quick query switcher and one-tap page scrolling.
- Touch-Draggable Action Pod: Customizable trigger button positionable anywhere on screen.
- Caspian Casks (Multi-Account Container Vaults): Isolate session cookies and login accounts per Cask (🌊 Caspian, ⚓ Pacific, 🐬 Atlantic, 🧊 Arctic, 🪸 Coral, 🔱 Abyss, or custom vaults) with 1-tap switching across ChatGPT, Gemini, Google, and YouTube while sharing global preferences.
- In-App Auto-Updater: Direct GitHub releases query, changelog viewer, and 1-tap in-app APK installer without external tools.
- Dynamic App Launcher Icons: Choose between 5 custom app icon themes (Classic, Cyber Cyan, Gold Shimmer, Midnight Violet, Matrix Emerald).
- Omnibox Browser: Integrated URL bar with tab switching, privacy controls, and clipboard search previews.
- Download the latest
.apkfrom GitHub Releases:- Caspian Flow (Beta C):
Caspian-Flow-v1.1.91-BetaC.apk - Caspian Mobile (Stable):
Caspian-Mobile-v1.2.40.apk - Caspian Beta A (Experimental):
Caspian-Beta-A-v1.2.48.apk
- Caspian Flow (Beta C):
- Open the file on your Android device (Android 7.0+).
- Allow installation from unknown sources if prompted.
You can use Obtainium to receive automatic background update notifications and install releases directly from GitHub.
- Install Obtainium from the official repository.
- Download the pre-configured setup file:
obtanium setup/Caspian_Obtainium_Setup_V2.json. - In Obtainium, go to Settings ➔ Import/Export ➔ Import configuration.
- Select the file to automatically configure all three Caspian app tracks.
- 100% Local Execution: Caspian runs entirely inside your browser's local sandbox and Android app runtime.
- Zero Data Collection: No prompts, chat logs, account credentials, or telemetry data are collected or transmitted.
- No External Tracking: Caspian makes no third-party network requests.
- Author: Copyright © 2026 Shivanshu Yadav (github.com/code4nigel)
- Repository: https://github.com/code4nigel/Caspian
- License: GNU General Public License v3.0 (GPL-3.0)
Built with 💗 by code4nigel