ReplyKit: AI Reply Generator & Radar for X

Find the X (Twitter) posts worth replying to, then get 3 reply drafts in your voice in one click. 10 free on day one, no API key.

Small X accounts grow in the replies. You show up under bigger posts with something worth reading, people tap your name, some of them follow. The hard part is knowing which posts are worth it, and writing 20 good replies a day without it eating your evening or sounding like a bot. ReplyKit does both, right inside X. Opportunity Radar marks the posts worth answering as you scroll, and one click gives you three replies that actually answer the post. Pick one, edit it if you want, then post. NEW IN 3.5.0: REPLIES IN YOUR OWN VOICE During setup, ReplyKit can read your own recent posts and replies on X and learn how you write: your casing, your usual length, your kind of humour, the topics you keep coming back to. From then on every draft is written your way, and your topics are filled in for you. Not logged into X yet? Log in when ReplyKit asks and it picks up right after. You can cancel at any point, nothing is ever posted for you, and you can re-learn or forget your voice anytime from the popup. ONE REPLY BUTTON, THREE DRAFTS Hit ✨ Reply and ReplyKit reads the post, then picks the move that fits it: a joke about one exact detail, a true insider fact, a counterexample, a question worth answering, or agreement with something added. Three different drafts stream in side by side. Pick one and hit Insert (or Copy), or Retry for three new ones. Want a particular angle? Tap a chip to steer it: Funny, Insight, Agree or Push back. REPLIES THAT SOUND LIKE A PERSON The reply writing was rebuilt from scratch and tested against real posts. Drafts are short, usually one sentence, and about this post rather than any post. They read like a sharp person in the replies, not an assistant: no lecturing the author, no punching down, no made-up stats, and none of the tics that give away AI writing (em dashes, "it's not X, it's Y", "great point!"). ReplyKit replies in the language of the post, and it looks at the conversation above it too. Every plan, free included, writes with Claude Sonnet. OPPORTUNITY RADAR Opportunity Radar marks the posts in your feed that are worth answering right now: in your niche, from accounts with a real audience, and early enough that your reply still gets seen. Each badge shows the author's follower count and how crowded the replies are, and it skips tiny accounts (you choose the floor: 1K, 10K or 100K followers). One click opens the reply with drafts already written. Everything runs in your browser and nothing is posted for you. Pro adds the Radar list (a ranked shortlist of the best posts you scrolled past) and target accounts, handles that always count as on-topic. FREE TO START Radar badges are free for everyone. 10 free replies on your first day, then 3 a day with no account. Sign in with Google in one click, or with your email (a one-time code, no password), and you get 5 a day. No API key, no credit card. YOUR TOPICS Tell ReplyKit what you post about (crypto, trading, SaaS, AI, your industry), or let it pick your topics up from your X posts, and it uses them to find posts in your niche, to colour replies, and to suggest ideas when you start a post from an empty composer. YOUR OWN POSTS TOO Open an empty composer on X and ReplyKit drafts three posts from an idea built on your topics. Prefer threads? Turn on Threads in settings and you get one thread instead, which goes straight into X's composer, one tweet per box. POLISH MY DRAFT Got a rough thought? Type it in the reply box, hit Polish my draft, and ReplyKit tightens it while keeping your point. ALSO WORKS ON LINKEDIN AND REDDIT The same panel shows up under LinkedIn comments and Reddit replies, with a style tuned to each: professional on LinkedIn, casual on Reddit. GO PRO 6.99 €/month replaces the daily cap with 1,000 replies a month. Pro also unlocks the Radar list, a ranked shortlist of the best posts you've scrolled past, plus target accounts, handles that always count as on-topic. Replies are written the same way on every plan; Pro gives you more of them and a better view of where to post them. Cancel anytime. PRIVACY Generation runs through our hosted service, so there are no API keys to manage. Signing in (Google or email) gives us your email address and nothing else from your Google account. If you choose "Learn my voice from X", ReplyKit reads your own recent public posts in your browser and sends them, with your handle and bio, to build a short style profile. The profile is kept on your device and you can forget it from the popup. Nothing is ever posted for you. To improve quality we may log prompt/reply pairs with only a plan label attached; with a learned voice these include a few of your own public posts. - ReplyKit is built and maintained by one developer. Found a bug, or a reply that missed? Hit 💬 Feedback in the reply panel (you can attach the post and the drafts) or use the Feedback card in the popup. It goes straight to the developer, and it gets read.