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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.
I strongly recommend using HakuNeko Desktop if you are reading in either PC or Mac. Basically allows you to point out "connectors" to online readers so you can read through the Desktop App, no ads, full screen and allowing for zoom, space adjustment between pages, reading direction and the like.
I've recently just managed to download chapters into .cbz files through it, that I can then open in my old iPad 2 using MangaStorm CBR for a great reading experience, it is great (it is a good option for when you decide to binge read a series, too much work if you just want the latest chapters or something like 3 chapters). This feature greatly reminds me of Calibre, which might help you understand it if you know about it.