PostOnce

PostOnce is a social media crossposting and scheduling tool. Connect your main account, keep posting where you already post, and within about 20 minutes PostOnce publishes each new post to your other platforms: TikTok, Instagram, YouTube Shorts, Facebook, LinkedIn, X, Threads, Pinterest and Bluesky. Plans include unlimited workflows and posts, scheduling, existing-content tools, image repurposing, a developer REST API (docs at https://docs.postonce.to) and a remote MCP server at https://postonce.to/mcp, so AI agents like Claude and ChatGPT can schedule and publish posts. A Buffer and Repurpose.io alternative for creators, small businesses and agencies. Paid plans from $29/mo with a 7-day free trial.