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Summary of the average MARSa scores for the three mobile apps.
| Mobile app | Usefulness domain score, mean | |||||
| Engagement | Functionality | Aesthetics | Information | Subjective quality | Overall score | |
| NIOSHb Sound Level Meter | 3.2 | 4.3 | 3.2 | 4.2 | 3.3 | 3.5 |
| Decibel X | 4.4 | 3.9 | 4.2 | 3.6 | 4.0 | 4.0 |
| SoundMeter X | 3.7 | 3.8 | 3.6 | 3.7 | 3.2 | 3.6 |
aMARS: Mobile App Rating Scale.
bNIOSH: National Institute for Occupational Safety and Health.
