Well…once again, to echo @Anthony_Juarez
I think what Anthony meant, but did not actually say is: A standalone app would be redundant, expensive, unnecessary, and actually a little dangerous. The website scales nicely to all mainstream mobile formats and it is easy to create a button to open your browser directly to the site server, which is where all of the content is managed. It’s SaaS (software as a service) and it’s done by professionals and specialists.
On a mobile device, this connection would leave the phone using TCP/IP protocol over LTE, WiFi, or Bluetooth. It is already in the ‘language of the web’.
TCP/IP provides the addressing scheme for computers that communicate via internet through IPv4 addresses (like 192.1868.0.50) or IPv6 addresses (like 2603:b23c:d:a421:edcd:9c82:41a4:7a5b). The digital data gets transmitted and received via your choice of whatever is available on your device (LTE/WiFi/BT).
To build a standalone app would take a front-end engineer and a back-end engineer, or a very highly paid full-stack engineer with several years of experience. The end product would be a standalone app that would interface with the main website server and would actually have to pull various API endpoints from data strings retrieved from the main site server.
This could actually slow your process down somewhat for the sake of using interfaces.
When accessing the standalone app via mobile, it would leave as a web request over TCP/IP through LTE, WiFi, or Bluetooth (no different than before) but it would have to do the extra work of interfacing with custom APIs through the same server to get the same information.
It takes more work to do the same thing.
The app would also require a maintainer.
Now the fun part: Hackers.
Building a standalone app offers a host of other venues for hackers to access valuable info. If the app is built by beginners, the attack surface is going to look like Swiss cheese. If the app is built by a security conscious professional, then it isn’t going to be cheap.
Simply put: It’s not worth the cost to reinvent the wheel.