Open Source Social Media Schedulers Compared (2026)

Postiz is the leading open-source social media scheduler with 35,365 GitHub stars and 14 supported networks. Mixpost is its main rival and uses a more permissive MIT licence with one-time pricing. But the honest finding is that for most people, Buffer's free plan beats every self-hosted option, because platform API fees now cost more than the software ever did.

Key takeaways

• Postiz (35,365 stars, AGPL-3.0) is the most active and supports the most networks, updated the day before this article.
• Mixpost (3,648 stars, MIT) uses one-time pricing, but its free Lite version supports only 3 networks.
• Socioboard carries a non-standard licence that GitHub cannot resolve, so treat it as a commercial risk.
• Every self-hosted option requires you to pay each platform's API fees yourself, and X charges $0.200 per post containing a URL.
• Buffer's free plan covers 3 channels at $0 with no server, no setup and no developer accounts.

The open-source options

Verified via the GitHub API in September 2026.

Postiz's 14 networks include Instagram, YouTube, LinkedIn, TikTok, Facebook, Pinterest, Threads, X, Mastodon, Bluesky, Reddit, Discord, Slack and Dribbble. Comparison articles frequently claim "30+ platforms," which appears to conflate networks with credential types. Use the 14 that its README actually lists.

Postiz versus Mixpost: the real difference

These two are the genuine contenders, and they differ in ways that matter beyond feature lists.

Licence. Postiz is AGPL-3.0, Mixpost is MIT. For someone simply using the tool, this makes no practical difference. For someone planning to build a product on top and resell it closed-source, MIT is materially freer. AGPL's network clause would require releasing your modifications.

Pricing model. Mixpost Pro is a one-time purchase rather than a subscription, with an Enterprise tier above it. For a business planning to run this for years, one-time pricing has obvious appeal against a recurring cloud fee.

The free-tier catch. Mixpost Lite is genuinely free and open source, but it supports only Facebook Pages, Mastodon and X. Many roundups conflate "Mixpost is free and open source" with "Mixpost free does everything." It does not. Instagram, LinkedIn, TikTok and the rest require the paid Pro version.

Maintenance. Postiz was updated the day before this article. Mixpost's last push was March 2026, roughly five and a half months earlier. Neither is abandoned, but Postiz is moving faster.

Socioboard carries a licence GitHub cannot resolve to a standard identifier, which means it needs legal review before commercial use rather than a casual recommendation.

The cost nobody counts

This is where self-hosting arguments usually fall apart, and it applies to every option above equally.

When you self-host, you register your own developer application with each social platform and pay that platform's API fees directly. Cloud services supply their own approved credentials.

X's published pricing:

A link post costs more than 13 times a plain one. Scheduling tools exist largely to post links.

Instagram adds constraints of its own: 100 API-published posts per rolling 24 hours, a professional account requirement, and permissions requiring Meta's approval process, which is documented as taking weeks.

Adding a server at Postiz's recommended specification, roughly $48 a month on DigitalOcean, plus $20 in X API fees for 100 link posts, self-hosting lands near $68 a month. Postiz Cloud is $29. Buffer's free plan is $0.

How hard is self-hosting really?

Harder than the marketing suggests, for all of these.

Postiz runs nine services: the application, PostgreSQL, Redis, and a full Temporal orchestration layer with its own PostgreSQL, Elasticsearch, admin tools and UI. A published production runbook documents a startup race condition returning 502 errors, a roughly 90-second compilation window during which restarting spawns duplicate processes that strand posts permanently in the queue, and Meta identity checkpoints surfacing as misleading errors.

Its issue tracker shows Instagram connection failures reported repeatedly, including one closed as "not planned" after the reporter isolated the fault to Postiz's backend.

Claims that any of these install in five minutes refer to first boot, not to a working connected account.

What about AI features?

Postiz includes an AI copilot and image generation, but when self-hosted these need your own OpenAI API key, billed at OpenAI's rates. The software runs fine without one; the AI features simply stay switched off. You get the feature hooks, not free inference.

That is worth knowing because "free social scheduler with AI built in" implies something the self-hosted version does not deliver without additional spend.

The comparison most articles avoid

For a beginner or small business, the genuine competitor to all of this is not another open-source project. It is Buffer's free plan.

Buffer free covers 3 channels with 10 scheduled posts each, for one user, at no cost. No server. No Docker. No developer applications. No API fees, because Buffer supplies its own credentials. It has mobile apps.

Self-hosted Postiz is better if you manage many channels, need data ownership, or already run infrastructure. Below roughly 10 channels, Buffer free is simply the better product for most people, and it is genuinely free rather than free-software-plus-costs.

Which should you choose?

Choose Postiz if you want the most networks, the most active development and full feature parity with its cloud version, and you can operate a server.

Choose Mixpost if you want MIT licensing for building on top, prefer one-time pricing over subscriptions, or only need Facebook, Mastodon and X on the free tier.

Choose Buffer free if you have 3 or fewer channels. This is the honest recommendation for most beginners.

Choose Postiz Cloud at $29 if you want Postiz without operating infrastructure. It is cheaper than self-hosting at recommended specs.

For the full self-hosting breakdown, read our Postiz review. For how these compare against commercial tools, see Postiz versus Buffer, Hootsuite and SocialBee.

The verdict

Postiz is the strongest open-source social scheduler available, and if you want to own your stack it is the right choice.

But the reason to self-host is control, not cost. Between servers and platform API fees, the free software ends up more expensive than the products it replaces. Pick it because you want ownership, and go in knowing the bill.

Related reading: best AI tools for social media content and best AI productivity tools.