ReplyFit: AI Reply & Post Assistant for X & Instagram

Replies in your voice on X and Instagram, stronger posts and threads on X, and who follows you back. You always press Post.

ReplyFit helps you reply on X and Instagram without sounding like a bot. Open a reply box and a small orange ReplyFit button waits next to the Reply button; nothing pops up until you press it. Pick a tone and what the reply should do, add your own words if you like, and press Write reply: one reply in your voice, checked before you see it. Already typed your own? Press Refine what I wrote for a tidier version that keeps your meaning. Writing a post on X? Write a viral post from a topic in one click, make your own draft go viral, rewrite and format a rough one, or turn a long one into a thread. You see whether that person follows you, and you edit and press Post yourself. A REPLY IN YOUR VOICE • For each reply, pick a tone (friendly, funny, sarcastic, dry, straight or inspiring), what it should do, up to two (agree, support, counter, add a point, ask a question or start a discussion), and a length: a one-liner or two lines. • Add your own words for that reply ("mention I tried this too") and ReplyFit works them in. • Wrote it yourself? Refine what I wrote gives a cleaner version in your voice. It keeps your points and never adds things you did not say. • Set your defaults once in the popup: tone, length, a "never use" list, and one line about you. • Every reply is checked before you see it: does it sound human, is it about the post, does it do what you asked, does it match your voice. If it misses, ReplyFit quietly writes it again once; anything it still missed is named under it. STRONGER POSTS AND THREADS ON X • Empty post box: type a topic (or leave it empty to use the line about you) and press Write a viral post: one post with a scroll-stopping first line, in the tone you pick. It shares a view, a tip or a question and never makes up stories, results or numbers about you. • Already wrote something? Make it viral opens with your boldest line and cuts the rest down. Rewrite & format turns rough or unformatted text into a clean post. A long text becomes a thread of 2 to 8 posts. • Every rewrite keeps what you meant, adds no facts you did not write, and stays within 280 characters. Each is checked for a strong first line and for sounding like a person, not a brand. • Use puts a post in the box; a thread comes with a Copy button on every post. Posting is still your click. WHO FOLLOWS YOU BACK • On X, open someone's profile and ReplyFit remembers whether they follow you, for 30 days, so the answer is there when you reply from your timeline. • On Instagram it shows when a profile says "Follow Back". Instagram shows nothing for mutual follows, so ReplyFit says "unknown" rather than guess. • It never opens profiles, follower lists or following lists by itself. YOU STAY IN CHARGE • It never posts, likes, follows, replies or messages for you. Use puts the reply you picked in the reply box; posting is always your click. • One reply or post at a time, chosen by you. It only helps when you say yes, and on every plan the daily limit starts low and grows only as you use it: activity that grows at a human pace is what keeps your account in good standing. • No login and no connection to your X or Instagram account. PRIVACY, PLAINLY • Nothing is read until you press Write reply or Refine, and then only that post's text and author handle, plus your own reply when you Refine. For a new post, only what you typed in the post box, when you press one of the post tools. • That text, your choices, your style settings and the follow status go to our server to be written by an AI model (Anthropic) and checked (TypeSafe AI). Our server keeps none of it. • Follow statuses stay in your browser. No ads, no trackers, no analytics. Full policy: https://tools.codewithkolin.com/reply-assistant-x-instagram/privacy/ FREE, WITH OPTIONAL MONTHLY PLANS • Free: 20 drafts a day for your first 3 days, then 5 a day. Each Write reply, Refine, Write a viral post, Make it viral or Rewrite & format is one draft and gives one reply or post; a thread is two. Follow status is unlimited. No account, no card. • Starter $5 a month: 600 drafts. Pro $15: 2,000. Growth $29: 6,000. The daily limit starts at 50, 100 or 150 and grows with use, up to twice what you used the day before (to 100 on Starter, 300 on Pro and Growth). Up to 3 browsers share one allowance. Switch plans any time. 14-day refund. • Every draft, free or paid, is written by Claude Sonnet 5.5, with Claude Haiku 4.5 standing in only if it is ever down. At most 10 drafts a minute, a human pace. ReplyFit is an independent extension, not affiliated with or endorsed by X Corp. or Meta. X and Instagram are trademarks of their owners. Questions: support@codewithkolin.com