The one plan, the founding price, the trial, per project.
One plan, everything included, per project. Nothing is counted per message, and there are no credits.
Every project starts with a free trial of three days, with no card. After it, the project needs a plan for Flexi to keep working; the site stays live at its address and everything you made stays yours.
Flexi, every agent, your site on a real address, your code on GitHub. The site quotes £100 a month or £30 a week, and a founding price while you keep it: £50 a month or £15 a week. Settings › Billing shows what your project pays, and Stripe's portal holds the card and the receipts.
A plan belongs to a project, not to a person. Two projects are two plans. Handing a project over hands the plan's place with it: the new owner pays from then on.