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. 2021 Jul 30;23(7):e27619. doi: 10.2196/27619

Table 4.

Technical features and quality assurance of included apps (N=98).

Feature App category, n (%) Total (N=98), n (%)

Well-being (n=20) Mental health (n=65) Depression (n=13)
App credibility

App content referenced or signed by the author 0 (0) 29 (45) 9 (69) 38 (39)

App includes a disclaimer that app information does not replace health care provider’s advice 5 (25) 41 (63) 9 (69) 55 (56)

App development team mentioned in app content


Government agency, academic institution, or nongovernment organization 2 (10) 4 (6) 0 (0) 6 (6)


Health care professional 1 (5) 36 (55) 11 (85) 48 (49)


Not declared 17 (85) 25 (38) 2 (15) 44 (45)
Data privacy

Authentication required to access app 12 (60) 46 (71) 9 (69) 67 (68)

App with a privacy policya 18 (90) 59 (91) 12 (92) 89 (91)


Presented before account creation 5 (6) 26 (29) 3 (25) 34 (35)


Explains how data are collected 17 (94) 58 (98) 12 (100) 87 (98)


Shares information with third-party providers 14 (78) 51 (86) 9 (75) 74 (83)


Shares contact details of Data Protection Officer 7 (35) 13 (22) 0 (0) 20 (22)

App allows users to share data 4 (20) 35 (59) 6 (50) 45 (51)

aPercentage calculation was based on the number of apps with privacy policy (well-being apps: 18; mental health apps: 59; depression apps: 12; total: 89).