Yes, you can use the app in Guest Mode. If you wish to use the app in Guest Mode, select Continue as guest on the pop-up screen. If you choose to register and create an account from Guest Mode, all your progress and activities will be added to your new account.
It's important to note that all your activities on Guest Mode will be lost if you decide to sign in to an existing account from Guest Mode.
The Guest Mode option will not be available if you have logged in to the app previously.
Here are the benefits of having an Insight Timer account.