Sure thing! The great majority of Newzik's features are available offline. 

Newzik has some cloud-based features that require an internet network to function. 

Here is a list of the features that require an internet connection:

  1. Sharing/receiving materials and markings in real time (our collaborative "Projects" feature).
  2. Importing sheet music from a file-sharing service or a partner music publisher
  3. Sharing/receiving sheet music via email or download link
  4. Saving up edits on the Newzik server. As soon as your device retrieves an internet connection, however, all of your edits will be synced up automatically.
  5. Signing in to a Newzik account

To sum up, you can be reassured of one thing: the app is built to work offline for performances.