The best alternatives to Skyportal are Stripe, Productboard, and ProdPad. If these 3 options don't work for you, we've listed a few more alternatives below.
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Intercom for Startups— Advanced AI-powered features at a 90% discount
Cape is a web portal for your customers that uses the data from your Google Sheets. Customers can login, see only their information with tailored permissions and update details, add support tickets, modify orders etc. It’s as customisable as your Google Sheet!