ReplyFit: AI Reply & Post Assistant for X & Instagram
Free AI reply generator for X and Instagram
Paste a post, pick what your reply should do, and get a reply that reads like a person wrote it, not a bot. Free, with no sign-up: 3 a day here, more in the Chrome extension.
Free for 20 drafts a day for your first 3 days, then 5 a day. No account, no card.
Writes replies the same way the extension does, checked for sounding human and staying on topic. Nothing is posted anywhere; see what happens to the text. 3 tries a day.
What makes a reply worth posting
Most AI replies are easy to spot: they praise the post, restate it, and end with an emoji. People scroll straight past them, and a lot of them in a row looks like spam.
A good reply does one thing well. It asks one real question, adds a point the post missed, or pushes back on one part of it. It is short, about that post and nothing else, and sounds like the person who wrote it.
How this generator writes them
- You pick what the reply should do, up to two things, and the voice and length
- It writes one reply, and quietly writes it again if it misses a check
- The reply is checked for sounding human and for being about the post; anything it still missed is named under it
- No emoji, no dashes, no “Great post!” openers and no hashtags, ever
Replying a lot? Use it where you write
The ReplyFit Chrome extension puts a small orange button in X’s and Instagram’s own reply boxes: press it, pick a tone and what the reply should do, and Use puts the reply in the box. It also shows whether the person follows you, tidies replies you wrote yourself, and on X writes viral posts from a topic, rewrites your own and turns long ones into threads.
You always press Post yourself. Nothing is ever posted for you.
Questions
Is it really free?
Yes. The generator on this page gives you 3 tries a day with no sign-up. The extension is free for 20 drafts a day for your first 3 days, then 5 a day; paid plans start at $5 a month.
Will it post for me?
No. Nothing is posted anywhere. You copy a reply, or in the extension press Use to put it in the reply box, and you press Post yourself.
Can X or Instagram tell it was written with AI?
The replies are written to read like a person: specific, short, with no stock phrases. What both sites penalise is spam, many near-identical replies fast, so use it to reply better, not more than a person would.
What happens to the post I paste?
It goes to our server, then to Anthropic, which writes the replies, and TypeSafe, which checks them. Our server does not keep it.
Replies in the tone you pick, viral posts in one click, and whether the author follows you back.
Questions: support@codewithkolin.com