Plans
Try it with no account. Pay when it's worth it.
Sigma Domain is usable before you sign up, free once you do, and five dollars a month when you start relying on it.
Guest
$0
No account. Nothing to cancel.
- 5 tool calls per day
- 25,000 AI tokens per month
- Full conversation and tool access
- No persistence guarantee — for trying, not keeping
Free
$0
Your work is saved and follows you across devices.
- 10 tool calls per day
- 50,000 AI tokens per month
- Private database and file storage
- Group conversations and sharing
- Browse the whole toolkit marketplace
Standard
$5 / month
Or $54 a year. For people using it as part of their actual work.
- 50 tool calls per day
- 250,000 AI tokens per month
- Keep going past the limits and pay only for what you use
- Second opinions from ~70 models across ~20 providers
- Usage analytics
- Everything in Free
Charging
How the money actually works
Guest and Free accounts simply stop at their allowance for the day or the month. Nothing is charged and nothing is owed. On Standard your monthly allowance is included in the $5, and if you go beyond it you keep working and pay for the additional usage rather than hitting a wall.
Tools published by other people may carry their own per-call price. That price is shown before the tool runs, and it's billed through your Sigma Domain account rather than requiring a separate relationship with the publisher. If you're on the other side of that — publishing and monetization.
Roadmap
Coming to paid plans
In development
Guaranteed access to the top Claude tiers. Every plan runs on Claude today. We intend to make the two highest current Claude model tiers a guaranteed entitlement of paid plans rather than the best-effort allocation it is now. It isn't enforced yet, so we're not selling it as though it were.
A Pro tier. Higher limits again, priority handling and programmatic API access, aimed at power users and small teams. Defined but not yet switched on.