01
Empty queue
Postiz
A scheduler is only as good as what you put in it.
Siren
Siren fills it: one line becomes a finished video or ad creative.
Compare
Siren vs Postiz
Siren makes launch videos and ad creatives in your brand from one prompt, and posts them to X, LinkedIn and YouTube (TikTok with your OK on each post). One video is $9.99; plans are Spark $19, Pro $49 and Scale $149 a month, and Siren works inside Claude, Cursor and ChatGPT over MCP. Updated 28 Oct 2026.
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 video or ad creative 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 videos in the first place.
At a glance
Where each product actually wins
Edge column is editorial judgment for a campaign team, not a feature scoreboard. Ties mean different jobs, not a coin flip.
| Dimension | Postiz | Siren | Edge |
|---|---|---|---|
| Primary job | Schedule posts | Make brand assets + post | Tie |
| Brand videos | A few AI videos a month | Brand motion graphics per prompt | Siren |
| Brand lock | None | Brand DNA on every render | Siren |
| Channels | 30+ | 4 | Them |
| Open source | Yes, self-hostable | No | Them |
| Agent access | REST API | MCP server (every plan) | Siren |
| Starting price | $29/mo | $9.99 for one video, or Spark $19 a month (videos, MCP and API on every plan) | Siren |
Honest split
Pick the tool that matches the job
Premium products do not pretend to do everything. Neither do we.
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 videos of your product in your brand, not generic AI clips.
- You want your agent to make and post from Claude Code or Cursor.
- X, LinkedIn, YouTube and TikTok (with your OK on each post) cover you.
Mechanism
Four differences that matter in practice
02
AI content
Postiz
AI images and a few AI videos per month on higher plans, generic to any brand.
Siren
Every video and ad creative starts from your Brand DNA, so the feed looks like one company.
03
Ownership
Postiz
Open source. Host it yourself if you like.
Siren
Hosted. Renders, music and posting are handled for you.
04
Using both
Postiz
Postiz can run a wide calendar across many channels.
Siren
Siren can make the videos that go into it.
FAQ
Straight answers
Does Siren schedule posts?
Yes. Post now or schedule at a time and timezone you pick, on X, LinkedIn, YouTube and TikTok (with your OK on each post).
Is Siren open source?
No. Its public MCP listing is open, the product is hosted.
Which is cheaper?
Siren starts at $9.99 for one video, or $19 a month for Spark; videos, the MCP server and the API are on every plan. Postiz starts at $29. They do different jobs, so compare on what you need made.
Also compare
Other tools people stack next to Siren
a thousand voices, one signature
Fill the queue with videos worth posting.
Brand DNA once. One line in, a finished post out.
