One identity, one bill

Your session belongs to the apex. Every subdomain inherits it. Open council.arksoftware.ltd after the trial and the page already knows you — no redirect, no second login, no friction between you and the work.

Billing is a single statement. Five lines if you carry five instruments. Trial windows are visible. Add-ons are itemized. The bill is the receipt — no surprises, no traps, no tiers theater.

There's no SSO product and no checkout app to babysit. The house is the room, and the room knows who you are. That's the point: less plumbing, more production.