Plans differ only by how many sites, and a few agency extras. No credits, no usage fees, no contract. 60 days free before you choose; no card for the first 30.
Yes. Each site includes up to $15 of AI work a month, more than a heavy month uses. If a site gets close you are emailed first; nothing is charged. A Heavy use add-on ($10 per site) doubles the allowance and is only ever switched on by you.
One domain connected with its CMS, Search Console and Analytics. Subdomains you connect separately count separately.
Any time. Switching is prorated on the next invoice. Extra sites on Agency and Scale are added the moment you connect them, prorated.
Not for the first 30 days. On day 30 you add a card to continue to day 60; nothing is charged until the trial ends, and only if you choose a plan.
No. Monthly plans cancel from the billing page and run to the end of the paid period. Yearly plans are ten months for twelve.