For people who post on X
Know what to post today. And what to skip.
Crux reads your niche every fifteen minutes, scores each opening against your actual audience, and tells you plainly when the loudest topic of the day is the wrong one for you.
Free tier, no card. X charges per API read — Crux passes that through at cost.
01
X API pay-per-use is breaking indie tools
Three tools in your feed changed pricing in the last 18 hours and none explained the maths.
03
Postgres 19 beta benchmarks
Loud topic, wrong room. You have never posted about databases.
Crux would not lead with this.
The Today feed. Every score reads as a sentence, never a bare number.
The problem
Most tools optimise for volume. That is why your feed looks like everyone else’s.
Generators will happily write you five posts about whatever is trending. They do not know that a third of your followers have never engaged with that subject, that forty accounts already posted the same chart this morning, or that you have no history to back the take.
Crux starts from the opposite end. It scores the opening before it writes a word, and on plenty of mornings its most useful answer is that today is a bad day to post about the thing everyone is posting about.
How it works
Three steps, and none of them post for you.
It learns your voice from what already worked
Crux reads your published posts — only the public ones — and derives the rules behind your best forty: you open on a number, your sentences run nine words, three hype phrases only ever show up in your worst posts.
It scores every opening on four axes
Momentum, audience, fit and crowding. A topic can be exploding and still be wrong for you — high momentum with an audience score of 34 means the room is full of people who do not follow you for this.
It drafts in your voice and waits
Drafts arrive carrying the scores they were written against, flagged if they break one of your own rules. Nothing enters the queue without you, and nothing leaves the queue without you.
The part nobody else ships
A copilot that says “not this one”.
Crux dims openings it scores badly instead of hiding them, and it shows the numbers behind the verdict. You can always overrule it — the draft button still works. But you will know what you are overruling.
A tool that only ever says yes is not giving you judgement. It is giving you volume.
03
Postgres 19 beta benchmarks
Loud topic, wrong room. You have never posted about databases.
Crux would not lead with this.
A real opening from the feed, scored and set aside.
Where we stand
Four things Crux will not do.
Post without you
No auto-posting, no auto-replies, no scheduled sends you did not approve. Every slot in the queue waits.
Mark up your API bill
X charges per read. You see the same number Crux sees, with a spend cap you set — the default is five dollars a month.
Farm engagement
No reply-guy automation, no follow-unfollow, no hooks engineered to bait a quote tweet. Those work until they do not.
Sell or train on your data
Your posts train your model and nobody else’s. Crux never reads your messages, and drafts never feed the model.
Questions
The ones we get asked before signing up.
Why do I pay X separately?
X bills per API read, and reading your niche every fifteen minutes is what makes the scores mean anything. Crux passes that cost through untouched rather than burying it in the subscription — typical usage on the Solo plan lands under a dollar a month, and you set the cap.
Will it sound like me or like a chatbot?
It derives rules from your own best posts rather than from a generic style prompt, and it flags its own drafts when they break those rules. It will not be perfect on day one, and the drafts are editable for exactly that reason.
Can I run more than one account?
Solo covers one account. Studio covers three, each with its own voice model — useful if you run a personal account alongside a product one, since the two rarely share a voice.
What happens if I stop paying?
Scanning stops, your drafts and voice model stay available for export for thirty days, and nothing is posted in the meantime. You can export everything as one JSON file at any point, including while your account is active.
Stop guessing which mornings are worth it.
Free while you watch it work. Nine dollars a month when you want it drafting.
Start free