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Postiz vs Zernio

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

Entry price
Postiz from $29/mo, Zernio from $6/seat/mo — different billing units, so no direct winner
Free plan
Both have one
Public API
Both have one
Higher Trust score
Postiz — 89 vs 70 for Zernio
Best fit
Postiz: Agencies and creators who want an exit from Buffer-style lock-in · Zernio: Developers building a product that needs to publish or read social data programmatically

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.ZernioA REST API and MCP server for posting, scheduling and reading analytics across 16 social platforms.

Side by side

FactPostizZernio
CategorySocial Media ManagementIntegration & iPaaS
Pricing modelFreemiumFreemium
Starts at$29/mo$6/seat/mo
Public APIYesYes
Trust score89 / 10070 / 100
PlatformsWeb, APIAPI
CompanyPostiz (Gitroom)Zernio
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

Zernio

Zernio is infrastructure rather than an end-user tool: it gives developers and AI agents one API and MCP server instead of integrating 16 separate social platform APIs individually. That is valuable if you are building a product on top of social publishing, but it is the wrong pick for someone who just wants a scheduling dashboard to click around in.

Pros

  • Single API covers 16 platforms instead of integrating each network separately
  • Ships a hosted MCP server so AI agents can call posting and analytics functions as tools
  • First two connected accounts are free, useful for testing before committing

Cons

  • Requires development work to integrate; there is no ready-made dashboard for non-developers
  • Per-account pricing at scale needs modeling before it's clear what a large account base will cost
  • No public information on the company or team behind it

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 Zernio if you need

  • Developers building a product that needs to publish or read social data programmatically
  • Teams wiring AI agents to post or respond on social platforms via MCP

Postiz vs Zernio: the questions people ask

Is Postiz cheaper than Zernio?

They charge in different units, so there is no like-for-like answer: Postiz starts at $29/mo, Zernio at $6/seat/mo. Entry price is the lowest paid plan as we last verified it.

Does Postiz or Zernio have a free tier?

Both: Postiz has a free tier, and Zernio has a free tier.

Which has a public API, Postiz or Zernio?

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

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