Write me a WebApp compatible with iOS, Android and PC web browsers

We have a simple calculator made on Excel, which we planned to share with our customers to help design a basic filtration solution based on our products.

We would like to convert the project into a simplified WebApp that runs on any device with a web browser.

The project will require the following:
- A nice and efficient graphical design
- A database to save customers input data/information and send it to us for further analysis
- A tool to produce a quote in PDF
- A tool to produce a simplified drawing based on the setup suggested in the quote with actual product images

If you had experience developing something similar, please share a link for a demo.

The attached screenshot is from the Excel project we made, which can be provided if needed.