You can cancel at any time. Your access continues until the end of the billing period you have already paid for.

Not yet. Each SyneMind account has one subscription. Multiple accounts covered by one bulk subscription are not yet supported.

Quota enforcement is not yet fully implemented. When it is, you will be blocked from adding further content.

SyneMind knows nothing about your credit card. An external payment service (Stripe) handles card expiry notifications and retry logic automatically.

Currently, payment is by credit card only, and is processed by Stripe.

Plans are shown on the Account - Plans page. The free plan is always available; paid plans unlock higher storage limits and additional features such as groups.