The best alternatives to SuperPortal are Stripe, Servicebot, and PayRequest. If these 3 options don't work for you, we've listed a few more alternatives below.
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Notion— Get over $6,000 worth of Notion + unlimited AI, for free
Provide your customers with beautiful Pricing Pages, Signup Forms, and Subscription Management Portals. Servicebot is the Stripe Billing UI toolkit to scale your subscription business.
WhenThen is a SaaS payments technology platform that global internet companies use to create, optimise and run future proof payment flows – in minutes. The no-code solution means no experts or engineers needed.