We already have a project which have web-application the projects coded on python / Flask and web application work with react. Admins send message through the web application(admins dashboard) to our customer with multiple roots (web applications, SMS, Email, Mobile Messengers like Viber,Whatsapp,Facebook etc.) Backend app control everythings. just we need an applications works fine in both IOS/Android for our customers and admins. so customers could see the messages which admins sent to them(through web applications). Also we have a news feeds page which we announce our news. clients should be able to login to application and check their new messages. The app must have an ability to receive push notifications too.