Postneedle
Type your X handle. Five needles read your last 20 posts and show which ones carry signal.
Or read a draft before you post it
Type your post. Five needles read it while you write, before anyone else does.
Post of the day is open: enter one of your own X posts, win by midnight UTC. Needle library · Leaderboard · Hall of fame
This is how it looks with the browser extension: the needles sit next to the Post button, and the button warns you when one is in the red. Nothing here posts anywhere.
Click a meter to switch it off. Free — a reading with fewer meters costs less, not more.
Everything here is free: the needles, account readings, the awards, the needle library and the share cards. A sponsor and a small charge for unlimited fixes pay for it.
What the five needles read
- Sounds AI-written
- Tidy groups of three, "it's not X, it's Y", generic uplift, and no detail only you could know. Clear writing alone does not move it.
- Humblebrag
- Showing off while pretending to be modest, grateful or annoyed. "We hit $40k MRR and one customer is 61% of it, which worries me" reads low. "So humbled, somehow we crossed $40k" reads high.
- Engagement bait
- A post built to farm replies or follows: "comment X and I'll send it", "agree?", a hook with the substance held back. A real question you want answered is not bait.
- Says nothing
- A platitude nobody could disagree with and nobody will remember. Short is fine. Empty is not.
- Turning a needle off
- Click a meter to switch it off, and click it again to switch it back on. It is free. A reading then asks one question fewer, so it costs less rather than more. The choice stays in this browser.
- Buried point
- The first line does not carry the point. This reads the opening, it does not predict reach. The same fact stated sharply, up front, stays out of the red.
Questions people ask
Can it prove a post was written by AI?
No, and it does not try to. It tells you how your own draft reads. Never use it to accuse anyone.
Does it work for LinkedIn and in Spanish?
Yes to both. Switch the preview to LinkedIn, and write in English or Spanish.
How is it this fast?
It runs on Jev, a System One model from TypeSafe AI that answers yes or no questions with a probability instead of writing text. All five questions go in one request and come back in well under a second, for about four thousandths of a cent.
Is it free?
Yes, all of it, with no account. A sponsor and a small charge for unlimited fixes pay for it.