We are asked this often. Most content tools have a free tier. Siren does not.

The short answer: the feature that makes Siren worth using costs real compute on every run. A free-forever plan would mean running that feature at a loss, indefinitely, for people who never convert. That is not a business.

What the pipeline costs

Siren's Reasoner, Brand DNA enforcement, and render pipeline run on every generation. At Siren's current architecture, a full run costs more than the marginal revenue of a typical free-tier user in a freemium text tool.

You can build a free tier around a product whose marginal cost is near zero: a cheap prompt-to-text call, a template fill, a stock-image resize. Siren is not that product. The Reasoner, the SirenSeed pipeline, and the render path run on every generation. That is where the value is. It is also where the cost is.

A free-forever plan would mean running that feature at a loss indefinitely for users who never convert. That is not a business.

What you get when you start

Spark starts at $19 per month. Your first onboarding post is free and full-resolution. After that you start a plan for credits. In the first week you can:

Set Brand DNA: archetype, palette, tagline, banned topics, tone axes.
Run generations through the full Reasoner and render pipeline on real prompts, not demo data.
Read brand-fit checks and flags on your actual content.
Connect one social account and see the Post panel before you dispatch anything.

There is no bag of watermarked previews. The first onboarding post is clean and free. New campaigns need credits on Spark or Pro. Downloads, posting, and API access are on a paid plan.

The three plans

Siren has three plans. The differences are infrastructure and product gates: generation volume, video access, template roster, and queue priority.

Spark. $19 per month. Stills, the REST API, the MCP server, and Brand DNA. For a solo founder validating the loop.
Pro. $49 per month. Everything in Spark, plus video, Brand Memory, Siren Studio depth.
Scale. $149 per month. Higher volume, priority queue, soft overage.

Visit mysiren.ai/pricing for current generation limits, seat counts, and platform-connection allowances.

The economics, plainly

Running the full generation pipeline costs real compute. At Spark the economics are tight by design. At Pro and above, the higher monthly fee matches higher generation volume, video cost, and Brand Memory retention.

A free tier would require us either to run full generation at a loss and hope for conversion, or to offer a stripped product that misleads people about the real pipeline. Neither is honest.

A paid plan with real credits is the right structure. The first onboarding post is free so you can see the product. New generates need Spark or Pro. There is no watermark bag and no seven-day trial.

Get started at app.mysiren.ai/signup.