Siren vs Postiz

Postiz is an open-source scheduler for 30+ channels. Siren makes the brand film or image and posts it. Compare scheduling what you have vs making what you post.

Postiz is a strong open-source scheduler with an API, 30+ channels and some AI images and videos. Siren starts earlier: it makes the brand film or still from your Brand DNA, writes the caption and posts it.

The cut: Pick Postiz when your content exists and you need a cheap, self-hostable queue across many channels. Pick Siren when the hard part is making on-brand films in the first place.

Where each product actually wins

Dimension	Postiz	Siren
Primary job	Schedule posts	Make brand assets + post
Brand films	A few AI videos a month	Brand motion graphics per brief
Brand lock	None	Brand DNA on every render
Channels	30+	4
Open source	Yes, self-hostable	No
Agent access	REST API	MCP server (Pro)
Starting price	$29/mo	Spark $19 (stills) · Pro $49 (films + MCP)

Choose Postiz if…

You already have the content and need to schedule it.
You want open source or to self-host.
You post to many channels (30+ supported).
Team calendars and approvals matter.

Choose Siren if…

Your queue is empty because making the content is the bottleneck.
You want films of your product in your brand, not generic AI clips.
You want your agent to make and post from Claude Code or Cursor.
Four channels (X, LinkedIn, TikTok, YouTube) cover you.

Empty queue

Postiz: A scheduler is only as good as what you put in it.

Siren: Siren fills it: one line becomes a finished film or still.

AI content

Postiz: AI images and a few AI videos per month on higher plans, generic to any brand.

Siren: Every film and still starts from your Brand DNA, so the feed looks like one company.

Ownership

Postiz: Open source. Host it yourself if you like.

Siren: Hosted. Renders, music and posting are handled for you.

Using both

Postiz: Postiz can run a wide calendar across many channels.

Siren: Siren can make the films that go into it.

FAQ

Does Siren schedule posts?

Yes. Post now or schedule at a time and timezone you pick, on X, LinkedIn, TikTok and YouTube.

Is Siren open source?

No. Its public MCP listing is open, the product is hosted.

Which is cheaper?

Siren starts at $19 for stills; films and MCP are on Pro at $49. Postiz starts at $29. They do different jobs, so compare on what you need made.

Also compare

Siren docs · Siren API · OpenAPI · Siren developers · llms.txt