About
Yubook is a publishing coach for people who post on X. It scores a draft against X's published ranking signals before anything goes out, and it finds the posts where a reply would put you in front of someone else's readers. It does not trade follows, and it does not post to X for you.
The problem
A small account can publish every day and still not get seen. The usual advice is to post more, or to swap follows until the number goes up. Follow-for-follow is fast for a week. Those people never read you, and you cannot get rid of them.
Most “algorithm scores” are a black box. They give you a number and no sentence to change. Yubook uses the ranking weights X has published, splits a draft into signals, and tells you what the writing is asking people to do — reply, share, click, or mute.
How it works
Sign in with X or an email magic link. Connecting X is how Yubook reads your account. It does not ask for posting permission on X.
Paste or write a draft. Yubook breaks it into signals and shows a forecast as a range, not a promised view count.
Open the reply queue. It ranks fresh posts from accounts you already follow, by freshness, audience, and competition, while the window is still open.
Run a seven-day plan. Replies and posts are split across the week to fit the size of the account and the time you actually have.
You keep the sentence. Threads can go out from Yubook when you press publish. X stays in your own composer.
Key features
Draft signal analysis
Score a draft before it is posted. The result is not one opaque number. You see which lines pull for a reply, a share, a click, or negative feedback, and you can rewrite the sentence and watch the reasoning update.
Forecast range
Predicted reach is a calibrated interval. It is not an official X score and it does not guarantee views or followers.
Reply target queue
When you open the app, Yubook polls recent posts (10-minute cooldown, last 60 minutes) and ranks where a reply would still land in front of someone else's readers.
Watched accounts
The main pool comes from your following list. A secondary pass finds accounts by category. News and broadcast accounts are excluded. You can add more watch slots if you need them.
Seven-day growth plan and calendar
A click-through onboarding (7 steps) builds a week of reply and post targets. You confirm days. The calendar follows that plan.
Follower tracking
Your own follower count is collected once a day. Looking up your own account is unmetered, so this stays free.
AI drafts, replies, and rewrites
When you want a starting sentence or a reply, Yubook writes in the language you chose. You edit before anything is published.
X + Threads
Connect Threads and publish there when you choose. Yubook does not auto-post to X.
Korean and English
The product, the drafts, and the replies follow the language you pick.
Free tools (no account)
X account status check — yubook.app/x-check
See whether search is still showing an account's posts. Official X API only. What it can see and what it cannot are listed separately. It will not invent a “no ghost ban” all-clear.
Best posting hours — yubook.app/best-time
Not a generic “post at 9am.” Median views from that account's own posts, in your timezone.
What Yubook will not do
Follow-for-follow lists
Post to X on your behalf
Promise follower counts
Pretend a heuristic is X's internal score
Pricing
Weekly $7.9 — every feature, cancel anytime.
Yearly $69.9 — same features, billed once a year.
Founder code FOUNDER takes $10 off the first yearly charge (limited).
Refills if you burn through a week: 20 drafts $1.90, extra watched accounts $4.90.
Paddle is the seller of record. Cards and PayPal. Tax is calculated for your region.
Start at https://yubook.app