The Free plan unlocks the whole Email Marketing system (campaigns, flows, templates, lists, contacts, tracking) with a limit of 150 emails per calendar month; once 150 have been sent, further campaigns are blocked until the next month or an upgrade. Plan tiers differ only by the monthly email allowance – there are no feature differences between tiers. You can move between plans at any time from the Billing page by clicking Sign up on another card; the new subscription replaces the previous one on your card on file. Cancelling the paid email plan entirely is handled through your Sprwt billing settings/support rather than a button on this page.