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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
If it's a web saas, we're building Saasform [1] with your use case in mind.
One relevant example is launching your MVP as a serverless API (e.g. on Firebase) + react/vue front end. Just iterate on your core product and features, we handle home page, registration and payments.
For mobile apps I'd recommend Expo [2] and, if you can, stay with their managed flow. If you want to iterate fast, you need to take into account the time to release to the stores and Expo can help with that. Similarly as for the web, I'd look into a serverless API model to start.
For email notifications I'd go with Sendgrid.
I personally never used no-code solutions but different people recommended Bubbles [3].
[1] https://saasform.dev
[2] https://expo.io
[3] https://www.bubbles.io
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