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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.
batteryKid is tiny in size and easy to use. Check it out on Github https://github.com/alaneuler/batteryKid! It is free and open source.
Maybe consider starring it if you find it useful
BTW: if you wonder why the hazards, read this article: https://batteryuniversity.com/article/bu-808-how-to-prolong-...
After trying Battery (https://github.com/actuallymentor/battery, it is Electron UI, big in size), I created batteryKid (https://github.com/alaneuler/batteryKid) with native Swift as a coding exercise out of curiosity.