PostSiete turns one idea into seven platform-native drafts - LinkedIn, X, Instagram, Facebook, TikTok, Threads and a long-form blog post - each written for its platform rather than copy-pasted between them, and previewed exactly as it will appear once published.
Publishing happens on five of those seven: X, LinkedIn, Threads, Instagram and Facebook, through each platform's official API and on your explicit action. TikTok and the blog post get a draft and no publish button. That distinction is the one tools like this tend to blur, so it is stated here rather than discovered later.
Written in your voice, without sending your writing anywhere. Voice matching compares nine numbers describing your style. Those numbers leave the browser; the draft does not.
Flat pricing. Free covers 10 posts a month, recurring rather than a trial. Pro is 12 dollars a month and Siete is 39. Neither is priced per channel or per seat, which is the mechanism that makes a scheduler's bill grow while the work stays the same size.
Self-hostable. The whole thing runs from a container you control, so leaving is a real option rather than a promise.
What it will not do: PostSiete never drives a logged-in browser session on your behalf. Tools that automate a session against a platform's terms get their users restricted, so publishing goes through the documented APIs or it does not happen. The companion Chrome extension, PostSiete Lens, reads the page you are on when you ask it to, and never posts.
Free tools, no account needed: a character counter that counts the way X actually charges - every link a flat 23, emoji and CJK 2 each, counted as grapheme clusters - plus a thread splitter that reserves the numbering before it splits, and a table of every platform's limit marked by whether the platform documents it or people merely report it.
