Buffer is one of the longest running tools in this category, launched in 2010, and it still has the cleanest take on queue based publishing. You connect channels, set a posting schedule, and Buffer releases your queue into those slots. It publishes to Instagram, Facebook, X, LinkedIn, TikTok, YouTube, Pinterest, Threads, Bluesky, Mastodon and Google Business Profile, and it comes with a free plan, a mobile app and an AI assistant for drafting.
It fits solo creators, freelancers and small teams who want something quick to learn and hard to get wrong. Buffer also has a better developer story than most closed platforms: a public GraphQL API that is free on every plan, an official CLI, and an MCP server, so AI assistants can queue posts directly. Pricing is per channel, which stays cheap for a couple of accounts and climbs once you manage many of them.
postqueen differs mainly on ownership and breadth. It is open source under AGPL-3.0, so you can self-host the whole thing for free, read the code and change what you need, and its plans bundle channels at a flat rate rather than billing each one. postqueen also covers 30 channels, including Discord, Telegram, Reddit, Slack and developer blogs that Buffer does not publish to.