PostOnce

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Post once on your main app and have it crossposted to your other accounts

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PostOnce

What it is

PostOnce is a crossposting service for creators and businesses. You connect your accounts through each platform's own login, pick a main app and keep posting there as usual. When PostOnce detects a new post, it republishes it to your other connected platforms within about 20 minutes, using the platforms' official posting APIs. Supported networks include TikTok, Instagram, YouTube, Facebook, LinkedIn, X, Threads, Bluesky and Pinterest. Paid plans include a developer API and an MCP server, so posts can also be published from ChatGPT, Claude, Claude Code, Codex, Cursor or other agents. It is built for UGC creators, coaches, small businesses, realtors, theme pages and agencies managing many client accounts.

Key features

Automatic crossposting from a main app
Nine supported social platforms
Developer API and MCP server
Publishing from AI chat and coding tools

What we liked

+ No change to your posting habit
+ Uses official platform APIs
+ Agent-friendly with MCP support

Worth noting

· No permanent free plan
· Monthly pricing is shown in a confusing per-day format

Editor's notes

More context from AI BirdView

The charm of PostOnce is that it asks almost nothing of you. Rather than learning a new scheduler, you keep posting in the app you already use, and the service quietly republishes each post across the rest of your accounts. For creators spread across many short-form platforms, that removes a tedious daily chore.

Detects new posts on your chosen main app and shares them to other platforms, which the site says happens within 20 minutes.
Supports TikTok, Instagram, YouTube, Facebook, LinkedIn, X, Threads, Bluesky and Pinterest.
Connects through each platform's official login and posting APIs.
Includes a developer API and MCP on all paid plans, so agents in ChatGPT, Claude, Cursor or Codex can publish for you.
Plans scale from 15 accounts on Creator to 200 on Agency, with a 7-day trial and no card required.

It is best for UGC creators, coaches, realtors and agencies who publish the same content to many audiences. A practical tip: choose the platform where you write the most complete captions as your main app, since that text travels with each crosspost, and review a few republished posts during the trial to confirm formatting on every network.