# Billing (/docs/billing)

Plans, pricing, and subscription management.



Solaris AI Flow has three plans: <PlanName plan="free" />, <PlanName plan="pro" />, and <PlanName plan="ultra" />.

Paid plans are one-time SOL purchases for a fixed <CycleDays />-day billing cycle. They do not auto-renew, and Solaris AI Flow does not keep a card on file. When the cycle ends, your account returns to <PlanName plan="free" /> unless you purchase another cycle.

* [Plans and Limits](/docs/billing/plans) - feature comparison and pricing
* [Upgrading Your Plan](/docs/billing/upgrading) - how to purchase, upgrade, and downgrade