This article explains how to set up opus1.io as an app tile on your home screen for both iPhone and Android and enable push/audible notifications for SMS.
For iPhone:
1. Open up your opus1.io log in page
2. Tap the Share icon (the square with an arrow pointing out of it) at the bottom of the screen.
3. Scroll down to the list of actions and tap Add to Home Screen. (If you don't see the action, scroll to the bottom and tap Edit Actions, then tap Add next to the Add to Home Screen action. After that, you'll be able to select it from the Share Sheet.)
4. Click Add
For Android:
1. Download a URL to app convertor, like Hermit in the Google Play Store
2. From there, follow these easy directions here: https://screenrant.com/turn-any-website-into-android-app-how/
How to Enable Push Notifications:
Once you've got the app tile ready, login and click the messaging icon in the top-right. Enable SMS notifications and optionally Audible notifications. This will allow you to get push notifications for incoming SMS on your mobile device.
To text from your mobile device, just navigate to Instant Messaging in your app.