Write X Threads with Claude

Yes. You can write 2 threads a day with no account. Sign in with Google, still free, for 10 a day. A thread that fails does not count. The notes box takes 2,000 characters, and a source article can be up to 30,000.

A LinkedIn post is read top to bottom by someone who already clicked "see more". A thread is read one tweet at a time, and many people see only one of them, quoted or retweeted on its own. So each tweet has to make sense by itself while the whole still reads as one piece, and the first tweet has to earn the rest. It does not open with "🧵" or "A thread:"; that opener is a habit, and readers have learned to take it as a sign of AI writing. Our Slop Score flags the same kind of habit in prose.

What happened, in the order it happened, with the names and numbers, and what you make of it. A thread is good at a sequence: a result, the three or four steps that got you there, and the point. Bullet points are fine, and so is a rough draft. Pick “About 5 tweets” or “About 10 tweets” at the bottom, or leave it on “Let it decide” and it writes as many tweets as the notes need.

The voice the thread is written in, picked at the bottom left; switch and press Write thread again to compare. Builder (“shipped, learned, what's next”), the default, is a young builder posting their work in public, casual and happy to go into the details. Marketer (“upbeat launch copy”) is bubbly and upbeat, with short lines and an emoji or two. Journalist (“a neutral news report”) is a veteran reporter, brief and hard to impress. Storyteller (“scene first, point later”) opens on a moment and takes its time. No persona writes your notes plainly. Marketer, Journalist and Storyteller are also presets in the StashBase app, where you can keep a Custom persona worked out from your own past posts.

Yes. Open “Add a source article” and give it the link to fetch, or paste the post, then say in your notes what you want the thread to get across. The same box works for someone else's article: the thread names the author and makes your view the point. It engages with the source rather than summarizing it, so a note on what you think does more than a note saying "summarize this".

The menu above the thread picks. “Standard”, the default, runs on Claude Sonnet 5 and is fast. “High quality” runs on Claude Opus 5.5, which thinks a little before it writes. It is slower, and suits a longer thread or one with more to get right.

It is told to take every fact from your notes and the source: no invented numbers, names, results or quotes. The voice is its own, so a persona adds reactions and asides in character, and it can join two of your points in a way you did not mean. Read the thread against your notes before you post it.

Each card shows its length out of 280 and turns red when it runs over; nothing is cut for you. The count is our estimate of how X counts: a link is 23 characters whatever its length, and Chinese, Japanese and Korean characters and emoji count as two. A tweet close to the limit is worth checking in X's own box. Copy takes one tweet at a time; Copy all takes the whole thread with a blank line between tweets, and “Post the first tweet on X” opens X with the first one filled in.

Not necessarily. If you pay for Claude, you can paste the same notes into a chat and ask for a thread; this page saves you writing the prompt, gives you the voices to switch between, counts each tweet, and runs on Sonnet 5 or Opus 5.5 at no cost to you. Where a chat falls short is your own material: past posts, drafts and sources in files on your computer. StashBase is a free, local-first writing workspace where Claude Code or Codex works beside those files, so a thread can draw on what you have already written.

No. Your notes and source go through our Cloudflare Worker to Anthropic's Claude API, which writes the thread. The Worker logs lengths and the tokens used, never the text. See our privacy policy.