Linx

# ✦ Linx ### AI-Powered Reply & Post Suggestion Tool for LinkedIn & X ![Chrome Web Store](https://img.shields.io/badge/Platform-Chrome-4285F4?style=for-the-badge&logo=googlechrome&logoColor=white) ![Manifest V3](https://img.shields.io/badge/Manifest-V3-34A853?style=for-the-badge) ![License](https://img.shields.io/badge/License-MIT-green?style=for-the-badge) ![PRs Welcome](https://img.shields.io/badge/PRs-Welcome-brightgreen?style=for-the-badge) **You have the opinion. Linx helps you articulate it.** **Powered by OpenRouter models.** [Features](#features) · [Installation](#installation) · [Usage](#usage) · [Configuration](#configuration) · [Privacy](#privacy) · [Contributing](#contributing) ---

Why Linx?

You know what you want to say. You just need help saying it well.

Linx is a suggestion tool, not an auto-reply bot. It helps you articulate your thoughts—turning your rough take into a polished reply that sounds like you, not a corporate chatbot.

The difference:

Spam bots generate generic replies without your input
Linx asks for your angle and helps you express it naturally

Without Linx	With Linx
Have an opinion, struggle to word it	Share your take → get 4 ways to say it
Generic “Great post!” comments	Your actual perspective, well-articulated
Hours spent on content creation	Brain dump → polished post in seconds
Replies that scream “AI wrote this”	Casual, human-sounding suggestions

Features

When you click “AI Reply”, Linx asks: “What’s your angle?”

Type your rough opinion — even just a few words like “disagree, this ignores edge cases”
Or skip if you want quick suggestions without input
Get 4 reply options that articulate your perspective
Try a different angle if you change your mind

This keeps you in control. Linx suggests—you decide what to post.

Human-Sounding Output

Linx is trained to sound like a real person, not a LinkedIn influencer bot:

AI-Sounding (Bad)	Human-Sounding (Good)
“Absolutely brilliant insights!”	“yeah this is solid”
“The utility here is unmatched”	“honestly been thinking about this too”
“Best-in-class workflow”	“we tried something similar, worked well”

Replies use casual language, contractions, lowercase where natural—like you’re texting a friend.

AI Reply Suggestions

Inject an “AI Reply” button on every post. Click it to get 4 unique reply suggestions:

Direct opinion — Clear, confident take on the topic
Strategic insight — Adds depth with experience or data
Punchy one-liner — Memorable, quotable response
Nuanced perspective — Balanced, thoughtful angle

Each suggestion is tailored to:

The post’s content and context
The author’s profile and industry
Your personalized voice and expertise
Platform norms (LinkedIn: professional, X: concise)

AI Draft Suggestions

Turn rough ideas into polished posts with “AI Draft”:

Open the post composer
Dump your raw thoughts, bullet points, or messy notes
Click “AI Draft” to get 4 polished post suggestions
Pick one, edit if needed, and post

Platform-aware formatting:

LinkedIn: Longer, professional, story-driven
X: Punchy, under 280 characters, hook-driven

Multimodal Understanding

Linx doesn’t just read text—it sees images too:

Extracts up to 2 images from posts
Sends them to the AI for visual context
Generates suggestions that reference image content

Deep Personalization

Complete a quick onboarding to teach Linx your:

Profile Field	Example
Name/Brand	“Jane Doe” or “Acme AI”
Role	“Founder building AI products”
Expertise	“AI agents, growth, developer tools”
Audience	“Builders, operators, founders”
Tone	“Direct, practical, opinionated”
Goals	“Build authority, share insights”
Avoid	“No cringe hype, no platitudes”
Topics	“AI agents, robotics, product building”
POV	“Builder-first, contrarian”
Signature phrases	Custom expressions you use

Linx auto-generates tailored system prompts for each platform and mode. You can also edit prompts directly for full control.

Model Selection

Linx fetches available models directly from OpenRouter using your API key.

Free models by default — safer cost control
Optional paid models — enable with a toggle (charged on your OpenRouter account)
Separate model choice for replies and post drafts

Adjust temperature (0.0–1.5) to control creativity vs. consistency.

Installation

From Source (Developer Mode)

Clone the repository

git clone https://github.com/adityasaini007/Linx.git
cd linx

Open Chrome Extensions
- Navigate to chrome://extensions/
- Enable Developer mode (top right toggle)
Load the extension
- Click Load unpacked
- Select the linx folder
Configure API key
- Click the Linx icon in your toolbar
- Enter your OpenRouter API key
- Complete onboarding for personalized replies

Getting API Keys

OpenRouter API Key

1. Go to [OpenRouter](https://openrouter.ai/) 2. Create or open your account API Keys page 3. Generate a key 4. Paste into Linx settings Use free models by default in Linx, or enable paid models when needed.

Usage

Generating Reply Suggestions

Browse LinkedIn or X as usual
Find a post you want to reply to
Click “AI Reply” in the post’s action bar
Share your angle (optional) — type your rough take, or skip for quick suggestions
Review 4 reply options (~2-3 seconds)
Click “Insert” to paste into the reply box, or “Copy” to clipboard
Try different angle if you want to approach it differently
Edit if needed and post!

Generating Post Drafts

Open the post composer on LinkedIn or X
Write a rough brain dump — bullet points, messy thoughts, key ideas
Click “AI Draft” next to the Post button
Review 4 polished suggestions in the modal
Insert your favorite into the composer
Refine and publish

Regenerating Suggestions

Not happy with the options? Click “Regenerate” to get 4 fresh alternatives, or “Try different angle” to provide a new perspective.

Configuration

Click the Linx icon in your Chrome toolbar to access settings:

API & Model Settings

Setting	Description
OpenRouter API Key	Your OpenRouter API key
Reply Model	Model used for generating replies
Draft Model	Model used for generating post drafts
Show Paid Models	Toggle to include paid models in selectors
Temperature	Creativity level (0.0 = focused, 1.5 = creative)

System Prompts

Linx generates 4 system prompts based on your profile:

Reply Prompt (LinkedIn) — For LinkedIn replies
Reply Prompt (X) — For X/Twitter replies
Draft Prompt (LinkedIn) — For LinkedIn posts
Draft Prompt (X) — For X/Twitter posts

You can:

Edit prompts directly for fine-grained control
Regenerate individual prompts after updating your profile
Regenerate all prompts with one click

Architecture

linx/
├── manifest.json      # Chrome extension manifest (MV3)
├── background.js      # Service worker — AI API calls, prompt building
├── content.js         # Content script — button injection, modal UI
├── content.css        # Styles for injected buttons
├── popup.html         # Extension popup — settings & onboarding
├── popup.js           # Popup logic — settings management
├── popup.css          # Popup styling
├── icons/             # Extension icons (16, 48, 128px)
├── PRIVACY.md         # Privacy policy
├── LICENSE            # MIT License
└── README.md          # This file

Data Flow

┌─────────────────┐     ┌──────────────────┐     ┌─────────────────┐
│   LinkedIn/X    │────▶│   content.js     │────▶│  background.js  │
│   (Post Data)   │     │ (Extract & UI)   │     │  (API Calls)    │
└─────────────────┘     └──────────────────┘     └─────────────────┘
                                                          │
                                                          ▼
                                                 ┌─────────────────┐
                                                 │   OpenRouter    │
                                                 │   (AI Models)   │
                                                 └─────────────────┘
                                                          │
                                                          ▼
┌─────────────────┐     ┌──────────────────┐     ┌─────────────────┐
│   Reply Box     │◀────│   content.js     │◀────│    Replies      │
│   (Inserted)    │     │  (Render Modal)  │     │   (4 options)   │
└─────────────────┘     └──────────────────┘     └─────────────────┘

Privacy

Your data stays on your device. Linx does not operate servers or collect analytics.

Concern	Answer
Where is data stored?	Locally in Chrome storage
What’s sent to AI?	Post content + your system prompt
Do you see my API keys?	No, they’re sent directly to providers
Any tracking?	None whatsoever

Read the full Privacy Policy.

Permissions

Permission	Reason
`storage`	Save settings and prompts locally
`activeTab`	Inject buttons on LinkedIn/X only
`scripting`	Insert replies into text fields

Host Permissions

Domain	Reason
`linkedin.com`, `x.com`	Content script injection
`licdn.com`, `pbs.twimg.com`	Fetch post images
`openrouter.ai`	OpenRouter API

Contributing

Contributions are welcome! Here’s how to help:

Development Setup

# Clone the repo
git clone https://github.com/adityasaini007/Linx.git
cd linx

# Load in Chrome (Developer Mode)
# Make changes and reload the extension to test

Guidelines

No frameworks — Keep it vanilla JS for simplicity
Privacy first — Never add tracking or external analytics
Minimal permissions — Don’t request more than needed
Test on both platforms — LinkedIn and X have different DOMs

Ideas for Contributions

Support for additional platforms (Threads, Bluesky)
More AI providers (Claude, OpenAI)
Keyboard shortcuts
Reply history/favorites
Export/import settings
Dark/light theme toggle

Troubleshooting

AI Reply button doesn't appear

- Refresh the page - Check that the extension is enabled in `chrome://extensions/` - LinkedIn/X may have updated their DOM — please [open an issue](https://github.com/adityasaini007/Linx/issues)

API errors or rate limits

- Verify your API key is correct - Check OpenRouter usage/credits dashboard - Wait a few seconds and try again (rate limiting) - Try a different model

Suggestions don't match my style

- Complete the full onboarding (both steps) - Use the "What's your angle?" input to guide the AI - Edit your system prompts directly for fine-tuning - Adjust temperature (lower = more consistent, higher = more creative)

Insert doesn't work

- Make sure the reply/compose box is open and focused - Try clicking inside the text field first - Use "Copy" as a fallback and paste manually

License

MIT License — see LICENSE for details.

Acknowledgments

OpenRouter for unified model access
The open source community for inspiration
Early users for feedback and bug reports

**Built with care for builders, creators, and operators.** **Linx** — Your AI writing assistant for LinkedIn & X. You think it, Linx helps you say it. [Report Bug](https://github.com/adityasaini007/Linx/issues) · [Request Feature](https://github.com/adityasaini007/Linx/issues) · [Contact](mailto:feedback.linx@gmail.com) · [Star on GitHub](https://github.com/adityasaini007/Linx)