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Postiz vs Sydium

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Postiz starts at $29, Sydium at $28. Only Postiz has a free tier. Only Postiz ships a public API.

PostizOpen-source social scheduler for 30+ networks, with a public API, MCP and self-hosting.SydiumLearns your writing voice from past posts, then drafts and schedules across ten social networks

Side by side

FactPostizSydium
CategorySocial Media ManagementSocial Media Management
Pricing modelFreemiumPaid
Starts at$29 month$28 month
Public APIYesNo
PlatformsWeb, APIWeb
CompanyPostiz (Gitroom)Sydium
Launched2024—
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Postiz

The rare scheduler where the escape hatch is real: same code, AGPL licence, Docker compose, and the maintainer says the hosted build has no extra features. If the price rises or the project stalls you move to your own server. The cost is that you are relying on one maintainer, and the hosted entry plan at $29 is not cheap for five channels.

Pros

  • AGPL-3.0 source on GitHub with Docker self-hosting, ~35k stars
  • Maintainer states hosted and self-hosted builds are functionally identical
  • 30+ networks including Bluesky, Mastodon, Threads, Discord and Warpcast
  • OAuth2, SDK, REST API and MCP for programmatic posting
  • n8n, Make.com and Zapier integrations

Cons

  • Hosted Standard is $29/month for only 5 channels and 400 posts
  • Effectively a one-maintainer project, so roadmap and support depend on one person
  • No company entity or country published
  • AGPL is a real constraint if you want to embed it in a closed product

Sydium

Counting plans in posts instead of opaque credits is refreshing, and the voice training plus the ten-network spread including Bluesky, Threads and Mastodon covers more ground than most schedulers. The thing to weigh is concentration risk: this is one person's product, and the top tier sells a priority line to that person.

Pros

  • Trains on your existing posts and site content before drafting
  • Ten networks including Bluesky, Threads and Mastodon
  • Plans metered in posts, with manual posts uncapped on every tier
  • Agency tier adds seats, approvals and branded client portals
  • No-signup demo lets you see generated posts before creating an account

Cons

  • No free tier at all
  • Trial requires a card up front
  • Single-founder product, so support and roadmap depend on one person
  • No API and no published analytics depth

Which one fits

Choose Postiz if you need

  • Agencies and creators who want an exit from Buffer-style lock-in
  • Developers wiring posting into agents over MCP or the REST API
  • Teams comfortable running Docker to avoid a subscription

Choose Sydium if you need

  • Founders and solo operators who want posts that sound like them
  • Agencies needing client portals, approvals and multiple autopilot accounts
  • Teams publishing to newer networks such as Bluesky, Threads and Mastodon

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