Skip to content
effecthub

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.

The short answer

Cheaper paid plan
Sydium — $28/mo vs $29/mo for Postiz
Free plan
Only Postiz (Sydium has paid plans only)
Public API
Both have one
Higher Trust score
Postiz — 89 vs 78 for Sydium
Best fit
Postiz: Agencies and creators who want an exit from Buffer-style lock-in · Sydium: Founders and solo operators who want posts that sound like them

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

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

Side by side

FactPostizSydium
CategorySocial Media ManagementSocial Media Management
Pricing modelFreemiumPaid
Starts at$29/mo$28/mo
Public APIYesYes
Trust score89 / 10078 / 100
PlatformsWeb, APIWeb, API, Chrome extension
CompanyPostiz (Gitroom)Sydium
Launched2024—
Last verifiedOct 16, 2026Oct 15, 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 an eleven-platform spread including Bluesky, Threads, Mastodon and Google Business 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
  • Eleven platforms including Bluesky, Threads, Mastodon and Google Business
  • Plans metered in posts, with manual posts uncapped on every tier
  • Agency tier adds seats, approvals and branded client portals
  • REST API, CLI and MCP access for posting from scripts or an AI assistant

Cons

  • No free tier at all
  • Trial requires a card up front
  • Single-founder product, so support and roadmap depend on one person
  • Video generation is billed separately in credits on top of the plan

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

Postiz vs Sydium: the questions people ask

Is Postiz cheaper than Sydium?

On published entry prices, Sydium starts lower — $28/mo against $29/mo for Postiz. Entry price is the lowest paid plan as we last verified it; what each plan includes differs.

Does Postiz or Sydium have a free tier?

Postiz has a free tier; Sydium has paid plans only.

Which has a public API, Postiz or Sydium?

Both ship a public API, so either can be built on; the fact table above shows the platforms each one runs on.

More comparisons

Browse all Social Media Management →