React native (expo)

I’m not sure if ReactVR is still under development.

Using ReactVR with THETA Images

Most people are using A-Frame for VR applications.

This is an example with Electron

HowTo: Develop 360 Image Desktop Apps with JavaScript and RICOH THETA

There’s some information on Cordova here:

Building Cordova Apps for RICOH THETA 360 Images

There is currently no example for Expo.

Most people use these examples:

GitHub - ricohapi/theta-api2.1-ios-sdk: RICOH THETA API v2.1 SDK for iOS

GitHub - ricohapi/theta-api2.1-android-sdk: RICOH THETA API v2.1 SDK for Android

You can also use Flutter. This tutorial series will take you through each step.