FastPost AI - Reply in Your Voice

Tracking since May 26, 2026.

Changelog

• Jun 8, 2026
  description

  FastPost AI brings an AI reply button directly into X — no tab switching, no copy-pasting.
  
  Click it next to any tweet, pick a tone, add quick instructions, and get a reply that sounds like you. Insert it in one click.
  
  Features:
  - Works inside X — inline on every reply box and post composer
  - Tone chips: agree, push back, ask a question, funny, and more
  - Custom instructions per reply ("keep it under 2 lines", "mention I'm bootstrapped")
  - Replies in your voice — not generic AI output
  - Works for replies, quote tweets, and new posts
  
  Built for founders and indie hackers growing on X.
  
  Requires a FastPost AI account — fastpost-ai.vercel.app

  Growing on X takes consistency. The hard part is showing up every day.
  
  FastPost AI puts an AI button inside X, next to every reply box and composer. Click it, pick a tone, and get a reply that sounds like you in seconds.
  
  The people gaining followers fast on X are the ones who reply first and post often. This makes that effortless.
  
  - Reply to any tweet in seconds in your own voice
  - Pick a tone: agree, push back, ask a question, be funny
  - Add quick instructions before generating ("keep it short", "mention I'm a founder")
  - Works on replies, quote tweets, and new posts
  - Inline — never leave X
  
  How to get started:
  1. Create an account at fastpost-ai.vercel.app
  2. Paste a few of your old posts. we analyze your writing style
  3. Install this extension
  4. Go to X, click the FastPost AI button next to any reply box, and generate
  
  fastpost-ai.vercel.app

• Jun 8, 2026
  short_description

  Reply on X in your own voice. AI-generated replies that sound like you, not a bot.

  Reply on X in your exact voice. FastPost learns how you write and generates replies that sound like you in seconds

• Jun 8, 2026
  name

  FastPost AI — Matching Style X Reply Generator

  FastPost AI - Reply in Your Voice

Permissions & access

Permissions

storageactiveTab

Host access

https://x.com/*, https://twitter.com/*, https://fastpost-ai.vercel.app/*

Screenshots