Chrome extension for LinkedIn and Threads
Replydex searches your topics, skips every post you've already engaged with, and lines up the best ones. You write each comment yourself.
Never posts for youNo accountData stays in your browser
42m ago · AI search · 18 reactions, 4 comments
We tracked 1,200 buyer questions across ChatGPT, Perplexity and AI Overviews. The brands that showed up most had clear comparison pages that answer one question each.
How a run works
Replydex opens LinkedIn and Threads in your own browser, as you, and reads them at a human pace. It only runs when you click.
"AI search", "B2B content", anything. Pick LinkedIn, Threads or both for each.
It searches the past 24 hours or the past week, scrolling slowly.
Anything you've already handled, liked or commented on is gone, plus your own posts and ads.
Fresh posts with room for your voice rise to the top.
Each post opens with the comment box ready. You write it and click Post.
The filter
The ranking
Recency, traction, your connection to the author and topic match all count. Each card shows the reasons.
Be first. Early comments get seen.
People are reacting, but the thread isn't crowded yet.
Ranked lower. Your comment would be buried.
Your own connections rank higher on LinkedIn.
People you star always rise to the top.
The post is actually about your topic, not just mentioning it.
Features
LinkedIn and Threads posts ranked together, each labelled with where it's from.
Post your comment and Replydex notices, records it and moves you on.
Three suggestions in your style, using your own Claude API key. You edit, insert and post.
Only see posts in the languages you work in, from 20 options.
See more of the people you want to build relationships with, and none of the rest.
Replydex reads your recent comments once, so it never shows you a post you've already joined.
Trust
FAQ
Yes. AI drafts are optional and use your own Anthropic API key, so any usage is billed by Anthropic to your account. A short draft costs a fraction of a cent to a few cents, depending on the model you choose.
Never. Replydex finds posts, opens them and gets the comment box ready. You write the comment, or edit an AI draft, and you click Post yourself.
LinkedIn's and Meta's terms restrict automated tools. Replydex is built to keep you in charge: it only runs when you click, reads pages at a human pace, works in small batches and never posts or reacts. It still reads search results for you, so use it with that in mind.
Claude Opus 5.5, Sonnet 5.5 or Haiku 5.5 from Anthropic. Drafts follow simple rules: respond to something specific, add something, no generic praise, no hashtags, and never invent facts about you.
Chrome deletes it. Everything Replydex stores lives in the extension's own storage on your device, so removing the extension removes the data. You can also clear your history at any time from the side panel.
Google Chrome 116 or later on desktop. It uses Chrome's side panel, so it stays open while you move between posts.
Replydex is coming soon to the Chrome Web Store. It's free, with no account to create.