2 tools. Schedulers you can run on your own server, with the source code public. Pay nothing in licence fees, or pay the maintainer for a hosted version.
Open-source scheduler you can self-host, with a hosted plan if you would rather not.
Self-hosted scheduler built on Laravel, with a free Lite edition and a paid Pro licence for teams.
Self-hosting a scheduler means you register your own developer apps with each social network, which is the fiddly part: Meta and TikTok app reviews can take weeks. Once connected, you get unlimited channels and full control of your data. Both tools listed here offer a hosted plan if you would rather skip the setup.
Postiz (AGPL) and Mixpost (MIT core, paid Pro) both ship regular releases and support a long list of networks.
Yes. Self-hosted tools require you to create developer apps on each network. The hosted versions of Postiz and Mixpost handle this for you.
A small VPS with Docker is enough, typically $5 to $15 a month, plus your time for updates.