Features
Everything about composing, nothing about scrolling: destinations sidebar, auto-threading, real character counters, Markdown with live preview, drafts, history, Shortcuts.
Destinations sidebar
Organize accounts into groups and post to a whole group in one click instead of picking networks one by one.
Auto-threading
Write past a network's limit and PostOnly turns it into a proper reply-chain thread automatically, with a live break marker in the editor as you type. Threads post in order, each reply attached to the previous one, on every network that supports replies.
Your threading setting is Ask, Always or Never. Networks without reply threads, such as LinkedIn, Instagram and Pinterest, tell you the post is over the limit rather than quietly splitting it.
Real character counters
Each destination gets a counter that reflects that network's actual rules, including instance-specific Mastodon limits, so you know before you send whether a post fits.
Networks with requirements beyond length, such as a required image or a minimum image size, show the requirement in the composer instead of failing after you hit send.
Markdown with live preview
Write in Markdown with a live preview, Apple Intelligence Writing Tools and spell check. One draft is converted correctly for each network on send.
Networks that cannot render formatting get clean text; the ones that can get their own native form of it.
Per-destination drafts
Every destination keeps its own auto-saved draft. Switch networks, switch apps, close your laptop: your words are where you left them.
That also means you can tailor a version for one network without disturbing the others.
Post history
A record of every send, with a direct link to the live post on each network, so you can check it landed or share it.
If one network fails, the others still go out, and the history shows which succeeded and which did not.
Your own site, free
Post straight into your Total CMS site's Feed, with images. Total CMS feeds are unlimited and free on every plan.
It makes your own site a first-class destination alongside the social networks, not an afterthought.
Genuinely native
PostOnly is SwiftUI for Mac and iOS. No Electron, no wrapped web view, so it launches fast and stays light on memory.
One purchase covers both platforms.
Shortcuts and automation
Send posts from Apple Shortcuts with the Send Post action, or from a postonly:// URL, without opening the app.
PostOnly also bundles an MCP server, so an AI assistant such as Claude or ChatGPT can queue drafts for you to review and send.
Images done right
Attach several images or build a carousel; PostOnly resizes and converts them for each network. Instagram Stories can be posted from the same composer.
Networks that fetch images from public URLs are handled for you, using short-lived hosting of the image.