Table 1 Descriptive data of the included apps (n = 25)

 iTunes

-

-

-

 Google Play

-

-

-

 iTunes and Google Play

-

-

-

 Free

-

-

-

 Paid (costs in AUD)

3.49

-

6.50 (1.49–7.99)

 Freemium

-

-

-

 Average rating (4+)

4.28 (0.26)

4.30 (0.50)

0.80 (4.00–4.80)

 Average number of user ratings (count)

279,611.33 (1,315,200.00)

190.00 (3418)

6,451,103 (22–6,451,125)

 Diet

-

-

-

 Physical activity

-

-

-

 Sedentary behaviour

-

-

-

 Educational

-

-

-

 Game (serious game, exergame)

-

-

-

 Other

-

-

-

Number of app features (1–10)

4.32 (1.93)

4.00 (3.00)

7.00 (1.00–8.00)

 Password required

-

-

-

 Inbuilt accelerometer

-

-

-

 GPS

-

-

-

 Educational information

-

-

-

 Alignment with guidelines

-

-

-

 Social networking option

-

-

-

 Push notifications

-

-

-

 Reminders

-

-

-

 Awards/rewards

-

-

-

 Gamification

-

-

-

 None

-

-

-

 Wearable tracker

-

-

-

 Website

-

-

-

Number of BCTs

6.12 (3.38)

6.00 (6)

14 (0–14)

 Engagement score

3.57 (0.73)

3.70 (1.05)

2.70 (2.00–4.70)

 Functionality score

4.10 (0.58)

4.00 (1.00)

1.90 (3.00–4.90)

 Aesthetics score

3.81 (0.81)

3.80 (1.35)

2.80 (2.00–4.80)

 Information quality score

2.79 (0.84)

2.90 (1.20)

3.30 (0.90–4.20)

 Total score

3.57 (0.60)

3.70 (0.85)

2.00 (2.40–4.40)