Google is working hard to make Assistant feel like second-class citizen of iOS. Siri is deeply rooted in the Apple platform so that his virtual assistant does not fit in with his convenience or access speed, but Google is getting closer with every tool.
You can already add a secondary widget to the left of the Home screen (or lock the screen). With today's update, Google Assistant introduces support for Siri Shortcuts.
So you can usually log phrases like "Ok Google" or "Hey Google". Then every time you speak to Siri, the Assistant app will open and immediately begin listening to questions or commands.
If iPhone is unlocked, say "Hey Siri" and say "Ok Google" to access hands-free (if that word is selected). Talk about crossing the stream. However, this feature has been improved.
You can also set the Siri shortcut for frequently used phrases as the assistant. Therefore, you can issue a custom voice command to run one smart home action or Google Assistant smart home routine to run inside Siri . If you say something like "Goodnight Google" to Siri, you can open the guide and do things like turn off all lights and lock the door. Pretty neat. meet? There is something in this shortcut.
Update to the latest version of Assistant for iOS to get new shortcut integration.