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tamagui
Style React fast with 100% parity on React Native, an optional UI kit, and optimizing compiler.
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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.
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I made Tamagui (with much effort) to solve this, which has probably the best setup out there at the moment for sharing your UI code on the frontend: https://tamagui.dev
For backend we're working on a starter kit that puts together all the pieces (there are a lot!) that's days from release, if you reach out on the Discord I can help get you on as a beta tester. It uses Supabase for data and auth, which seems to give the best overall package for data and auth.
For state depends entirely on the complexity of app. For simple apps you can get away with just something like React Query and Reacts useState, for more complex one of Daishi's state management libraries (everyone has their different preference, I love the black sheep Valtio), or the new kid on the block Legend State looks interesting.
I specifically selected Expo / React Native + Typescript for its Authentication library[1] that allowed me to easily integrate Stripe's web login[2]. Expo apps can also be exported as PWAs using Workbox[3] so you could have your app distributed by yourself and have a native version in the app stores
[1] https://docs.expo.dev/develop/authentication/
[2] https://github.com/hbcondo/revenut-web#-authentication
[3] https://developer.chrome.com/docs/workbox/
