So what i am planning to build is SAAS service that provides all the feature's listed above and more, customised for an (unspecified for competitive purpose) industry. The web client is used for entry of data related to sales, stock, payroll. I am also making apps for various operator's inside the plant to upload data using their android phone's and tablets.

Then i want to process and display all this data (related to Manufacturing, Sales, Marketing etc) on web, iOS and Android.

So essentially there will be apps for employee's working in the plant (for data entry) as well as for the managers and owners (to monitor everything and make decisions)

I want the web dashboard to look somewhat similar to - https://demo.baremetrics.com

And since i have no experience in building mobile apps i want to know what languages/frameworks would be best suitable to develop good/native looking apps for iOS and Android using web technologies.

Thanks.