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The fastest way to reply to tweets using AI and the easiest way to boost your tweet impressions. Replix adds an AI reply assistant directly to your X timeline. Click the Replix button under any post, get three drafts written in your voice, pick one, and send. No new tabs, no copy-paste. CHOOSE YOUR MODEL Most reply tools lock you to a single model. Replix lets you switch between: - GPT-5.6 Terra — balanced default, fast and reads nuance well - GPT-5.6 Luna — lighter and quicker, for high-volume days - GPT-5.6 Sol — the heavyweight, for technical threads or large accounts - Grok 4.6 — looser, funnier, more willing to be blunt - DeepSeek V4 — a different voice, good at dry humor Switch anytime from the popup. Your tone and length settings carry over. New models appear automatically without an extension update. 10 TONES Neutral, Supportive, Contradictory, Humorous, Analytical, Casual, Professional, Controversial, Educational, and Empathetic. Each is a separately tuned writing style. Pick one tone to get three different takes, or select several tones and compare them side by side. IT DOESN'T SOUND LIKE AI Replix is tuned against the usual tells: no "Great point!", no "Absolutely!", no corporate hedging, no hashtag spam. It leads with the interesting part and varies sentence length like real writing. Most importantly, it responds to what the post actually says, not to the topic in general. SETTINGS YOU CONTROL - Reply length — eight options, from a two-word response to 300+ words for X Premium - Emoji level — none, minimal, standard, or heavy - Voice options — all-lowercase, minimal punctuation, no @mentions, no hashtags, extra line breaks, natural imperfections - Force a question — end replies with a genuine question to start a conversation - Language — mirrors the post's language automatically, or lock it to one you choose LIVE WEB SEARCH Turn on web search and Replix pulls current information before writing, so replies to breaking news reflect what's actually happening. Available on paid plans. BUILT FOR SPEED - Keyboard shortcuts: Ctrl/Cmd+Shift+L to generate, Ctrl/Cmd+Shift+E to move between posts - Shadow DOM isolation, so Replix renders natively inside X without breaking layouts - Replies typically arrive in 1–2 seconds - The popup shows how many replies you've generated and posted today PRIVACY AND SECURITY - Sign in with Google OAuth 2.0 or email and password (passwords hashed with bcrypt) - AI provider keys stay on our servers, never in your browser or the extension bundle - Replix runs on x.com and twitter.com only and cannot see any other site you visit - We don't sell your data and we don't train on your replies HOW IT WORKS 1. Install Replix and pin it to your toolbar 2. Sign in with Google or email 3. Set your model, tone, length, and emoji level 4. Browse X as usual 5. Click a Replix button under any post 6. Pick a draft, edit if you want, and send WHO IT'S FOR Content creators, founders and indie hackers, marketers and agencies, job seekers, and anyone who wants to reply well without spending an hour on it. COMMON QUESTIONS Will people know it's AI? Replix produces a first draft, not an autopilot. You can edit anything before sending. Does it post automatically? No. Replix places the draft in X's reply box. Nothing sends until you click send. Do I need my own API key? No. All models are included. Does it work on the X mobile app? It's a Chrome extension, so it works in Chrome on desktop and in mobile browsers that support extensions. Can I change models later? Anytime, from the popup. PRICING Start free with 2 AI replies per day, no card required. Upgrade for higher volume, web search, and long-form replies. Cancel anytime; your plan stays active through the period you've paid for. getreplixapp.com SINGLE PURPOSE Replix is an AI writing assistant that integrates into the X (formerly Twitter) interface, allowing users to generate context-aware reply drafts to posts with a single click. PERMISSION JUSTIFICATIONS activeTab: Reads the text of the post the user is currently viewing on X/Twitter to provide context for AI reply generation, and injects the reply buttons into the page only on supported domains. storage: Saves user preferences locally (language, default tones, model choice) and stores authentication tokens so users don't have to sign in each session. scripting: Injects the content scripts that read posts, add reply buttons beneath them, and insert generated text into the reply composition box. tabs: Detects when the user navigates to twitter.com or x.com so content scripts load only on relevant tabs and not on unrelated sites. identity: Handles secure sign-in via Google OAuth 2.0 so users don't need to create and store a separate password in the extension. HOST PERMISSIONS Access to twitter.com and x.com is required for the extension to read posts and render its interface inside these platforms. Access to replix.aigentlabs.org is required for secure communication with our backend, which processes AI generation requests, stores user preferences, and handles authentication.