Questionnaire responses
| Question | Agree | Disagree |
| I think the app is user friendly | 24 (100%) | 0 |
| I like the overall layout of the app | 24 (100%) | 0 |
| I was easily able to complete 3 inhalations using the app | 24 (100%) | 0 |
| Similar effort was required for me to inhale using the app and the plastic device | 20 (83.3%) | 4 (16.7%) |
| I could easily understand the screen instructions displayed by the app | 21 (87.5) | 3 (12.5%) |
| The attempt counter displayed by the app is useful for tracking inhalations | 20 (83.3%) | 4 (16.7%) |
| The timer displayed by the app gave me motivation to persist | 18 (75.0%) | 6 (25.0%) |