Best open-source alternatives to Buffer

Postiz is an open-source social media scheduling platform aimed at individuals and teams that need to plan, manage, and analyze content across multiple social networks. The README positions it as an alternative to tools like Buffer and Hypefury, and emphasizes AI-assisted posting, audience growth, and lead capture. The project supports collaboration features such as inviting team members, commenting, and scheduling posts together. It also highlights automation and integration use cases through a public API and compatibility with tools like n8n, Make.com, and Zapier. The self-hosted and hosted versions are described as having no functional difference, and the stack centers on Next.js, NestJS, Prisma, PostgreSQL, Temporal, and Resend.

Mixpost is a social media management platform aimed at businesses, marketing teams, agencies, and solo users who want to organize and automate their publishing workflow. It centralizes multiple social accounts, helps users plan and schedule posts, and provides analytics to track audience engagement across platforms. The project also emphasizes collaboration through workspaces, task assignment, permissions, and performance monitoring, making it suitable for teams that manage content together. The README presents it as the Lite version of Mixpost Pro, with a free MIT-licensed codebase and a separate commercial Pro/Enterprise offering.