Table 3 Feasibility and usability measures (n = 100)

1

The web-based survey platform is easy to use

3.91 (1.02)

64.4

2

It is easy to carry the smartphone with me

4.33 (1.01)

57.4

3

I carried my smartphone with me every day

4.56 (1.31)

67.3

4

After the researcher’s explanation I understood how the web-based survey platform would work

4.17 (0.96)

64.4

5

It was fun to work with the platform

3.21 (1.45)

69.3

6

It was boring to work with the platform

2.89 (1.08)

42.6

7

The web-based survey platform worked well

4.75 (2.81)

46.5

8

I experienced the prompts as reasonable

3.68 (0.38)

44.6

9

The number of prompts was annoying

2.32 (1.84)

49.5

10

I filled in the web-based assessment for 14 consecutive days

4.88 (0.86)

87.1

11

I filled in the web-based assessment 2 to 3 times a day

4.68 (1.31)

91.1

12

It was easy to fill in the web-based assessment on my smartphone

4.41 (2.30)

49.5

13

The questions were well-displayed on my smartphone

4.11 (1.72)

44.6

14

Filling in one web-based assessment was an interruption of my daily activities

3.09 (2.61)

41.6

15

Filling in one web-based assessment took too long

1.79 (1.01)

71.3

16

The study took too long

3.54 (1.25)

79.2

17

I understood the questions that were asked

3.80 (2.22)

86.1