Block AI
ReplyGuyXBlockAI · Chrome Extension

ReplyGuyX Auto Reply

AI writes sharp, on-brand replies to the tweets that matter in your niche — and posts them through your own X session, human-paced so they read like you, not a bot.

Add to Chrome — it's freeDownload .zip (advanced)

One click from the Chrome Web Store and you're set. Prefer to sideload? The .zip + Load Unpacked steps below still work.

Why an extension? X's API doesn't allow replying to other people's posts on pay-as-you-go plans. Running in your own browser, as you, sidesteps that entirely — the replies post exactly like a real user typed them.

How it works

You set it once. It does the replying.

Step 1

We find the tweets

BlockAI monitors the influencers + topics in your niche and surfaces fresh tweets the moment they post — replying early is where the reach is.

Step 2

AI writes the reply

Claude drafts a short, human reply in your voice + stance — a genuine take, never generic praise, no hashtags, no AI tells. You can review every one.

Step 3

Your browser posts it

The extension posts the reply through your own logged-in session, jittered a minute or two apart with a daily cap — and never while you're mid-reply yourself.

Before you install

Get a ReplyX subscription first

The extension only posts for an active subscriber — it's matched to the X account you're logged into. No subscription, nothing to post.

Subscribe in the BlockAI Mini App. Open the BlockAI bot on Telegram, choose ReplyX, pick your topics and voice, and pay with credits, card, or crypto. This sets up the account the extension will reply as.

Connect the same X account you'll be logged into in Chrome. The extension detects your handle automatically and pulls only your replies.

Subscribe on Telegram
Install

One click from the Chrome Web Store

The fastest way — install it directly and get auto-updates.

Add to Chrome

Prefer to sideload (no store account, full control)? Do it in 6 steps:

  1. 1
    Download the extension
    replyguyx-extension-0.1.2.zip — about 80 KB.
  2. 2
    Unzip it
    Locate the downloaded file and unzip it. You'll get a folder containing manifest.json plus some assets. Keep this folder somewhere stable — deleting it later uninstalls the extension.
  3. 3
    Open Chrome extensions
    In Chrome, paste this into the address bar and hit Enter:chrome://extensions/
  4. 4
    Enable Developer mode
    Toggle Developer mode ON in the top-right of the extensions page.
  5. 5
    Load unpacked
    Click Load unpacked and select the unzipped folder from step 2 — the one that contains manifest.json (not a sub-folder inside it). The ReplyGuyX icon appears in your toolbar — pin it via the puzzle icon.
  6. 6
    Log into X as your subscribed account
    Open x.com in any tab, logged in as the account from your ReplyX subscription. The extension detects your handle, confirms your subscription, and starts posting replies — paced a few minutes apart. The popup shows live progress and a pause switch.
Safe to install. Standard Manifest V3 permissions (storage, alarms, tabs) for x.com only. It never reads your cookies or password — it acts inside the session you're already logged into. Full source review on request: hello@blockmm.ai.
FAQ

Quick answers

Do I have to keep Chrome open?+
Yes. The extension posts through your own browser session, so Chrome needs to be running (and you logged into X) for replies to go out. Close it and it simply pauses — it picks back up when you reopen. There's nothing running on a server posting as you.
Why not just use the X API?+
X's pay-as-you-go API plan doesn't allow replying to other users' posts — only posting your own tweets. We proved this: a standalone API tweet works, but the same reply 403s. The web client has no such limit, so ReplyGuyX posts through your real session instead.
Do you see my X password or cookies?+
No. The content script runs inside x.com after you're already logged in through your normal browser. It never reads or stores your password, login cookies, or auth tokens — it only types a reply and clicks Reply, the same actions you'd take by hand.
Will this get my account flagged?+
Replies are randomised a minute or two apart with a daily cap (the real volume limit), and it never replies to stale tweets — so it reads like you, not a metronome. It also defers if you're typing your own reply, and works in a background tab, so it never interrupts you. Running as you, in your real browser, is far less detectable than server-side automation. It's a managed risk, not zero risk — keep the volume sensible and the replies high quality.
Can I see the replies before they post?+
Every reply is generated server-side first and is visible in your ReplyX history. The popup shows what's queued and posting, and you can pause instantly. If anything ever looks off, pause and tell us — we tune the voice.
Is it on the Chrome Web Store?+
Yes — ReplyGuyX is live on the Chrome Web Store, so it's a one-click install with automatic updates. If you'd rather not use a store account, the sideload (.zip + Load Unpacked) option still works too.
ReplyGuyX

Reply first, every time.

Subscribe to ReplyX, add the extension, and let AI keep you in the conversation across your niche — in your voice, on your account. Built by BlockAI in the UK.

Add to Chrome — freeSee install steps
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