Bubble is web development framework and a visual programming tool. It enables non-technical people to build production-ready web and mobile apps without code.
It probably can be used successfullyCons:
Everything is very difficult, with data upload impossible
An app that's more about doing something technically than paying any attention to the user or use-cases. Is just very impractical, with all the real-world features difficult to impossible. Just look at data-upload: https://forum.bubble.is/t/best-way-to-bulk-upload/1690Josh Jacobson has used this product for one year.
If you can do Excel, you can create an app eCesar Sacconi Falcao has used this product for one year.