Post what you ship, in your voice.in your voice.while it’s fresh.faster.

Crux, also called Cruxpost after its domain cruxpost.com, turns what you ship into posts for 𝕏 (formerly Twitter). You connect GitHub and choose the repos it watches. When you push to a repo’s default branch, merge a pull request or publish a release, Crux writes three drafts about it in your voice and puts them in your Inbox a few minutes later, and your coding agent can add what changed and why through the Crux plugin for Claude Code and Codex. You copy the draft you like to 𝕏 and post it yourself, or, on Autopilot, schedule it and Crux posts it for you. Crux then finds the post, reads its numbers at 1 hour, 24 hours and 7 days, and shows what works for your account once a finding beats a test against chance. Pro is $19 a month or $180 a year ($15 a month), and the launch deal is Pro for life for $49 once, for the first 100 buyers. Every account starts with a 7-day free trial of Pro that needs no card. When it ends without a paid plan, the account is read-only: you can still see, download or delete your data, and choose a plan. Cancel anytime. Crux is not affiliated with X Corp.

Only what the repos you choose to watch send it through the Crux GitHub App, whose access to them is read-only. For each commit pushed to a watched repo’s default branch: its message, when it was made and the names of the files it changed. For a pull request merged into the default branch: its number, title and description. For a published release: its tag, name and notes. Crux also keeps each repo’s name, its default branch and whether it is private. Merge commits, pre-releases and commits whose message contains [skip crux] are left out.

No. Crux reads commit messages, pull request and release text, and the names of the files a commit changed. It never fetches a file or a diff, so your code stays on GitHub. GitHub sends push events only to apps with read access to a repo’s contents, which is why the Crux GitHub App asks for it; Crux never uses that access to open a file.

The same as text from a public one. The commit messages, pull request and release text and your agent’s notes in a batch go into the request that writes its drafts, and that request goes to a free AI model through OpenRouter. Nothing from a private repo is published unless you post or schedule a draft, or publish its entry on the repo’s public changelog, yourself. If a repo’s commit messages should not leave GitHub, leave it unwatched in Settings.

Only what you schedule, on Autopilot: a draft goes to 𝕏 when you pick a time or press Post now, after you allow Crux to write to your 𝕏 account and turn posting on in Settings. It never replies, likes or follows on your behalf, and signing in gives it read-only access. On every plan, Post on 𝕏 copies a draft and opens 𝕏 with it, ready for you to post.

From your own posts, not other accounts’. Your past 𝕏 posts are the baseline: each post’s engagement is divided by the median of the 20 posts published nearest it in time, so follower growth does not decide the result. Every post Crux finds from one of its drafts carries the kind of work it announced (launch, feature, fix, improvement, milestone or other). Learnings test each kind, and posts from Crux drafts, against your usual post, alongside your hooks, formats and topics. A finding is shown only once it falls outside the range that random draws of your own posts produce. Until then, Learnings count the posts each kind has so far and claim nothing.

It lets your coding agent tell Crux why a change matters, which a commit message rarely says. You install it in Claude Code or Codex with a token you create in Settings. After a change people would notice, such as a feature, a visible fix or a launch, the agent sends Crux a short note on what changed, why, and for whom, and Crux writes from the note first. Its instructions tell the agent to skip refactors, chores and dependency bumps, and to leave out secrets, customer names and numbers you have not made public. It works without GitHub connected: after a short wait, a note on its own becomes a draft.

Sign in with 𝕏: the first sign-in creates your account. Then connect GitHub in Settings and choose the repos Crux watches, and your next push becomes a draft.

To sign in, read-only access through the 𝕏 permissions tweet.read, users.read, offline.access. They let Crux read your posts and profile, find the posts you publish from its drafts, and stay connected without asking you to sign in again. Crux never asks for permission to like, follow or read direct messages. You can also upload your 𝕏 archive instead of importing through 𝕏.

To write drafts: the ones Crux writes when you ship, and the ones you ask for. A draft request carries the work it is about and a profile of your voice built from your own posts. Crux sends those requests to a free AI model through OpenRouter. Other people’s posts are never sent to it, and the analysis of your posts and every score are computed in code, not by a model.

Pro is $19 a month or $180 a year ($15 a month), and the launch deal is Pro for life for $49 once, for the first 100 buyers. Every account starts with a 7-day free trial of Pro that needs no card. When it ends without a paid plan, the account is read-only: you can still see, download or delete your data, and choose a plan. Cancel anytime.