App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 330 · 40 questions

Developer's tip (Big and bold): Our rule: every button is at least 48 px tall. Missing px = 48 − height. Leave space between buttons; use clear words like Save or Send. Strong contrast (black on yellow, white on dark green) is easy to read; similar colours are hard.

1. 1.🔘 Is this good or poor button design: a big, easy tap area? (a) poor design (b) good design
2. 2.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Done button: 52 px tall
   Save button: 52 px tall
   Start button: 28 px tall (a) Done (b) Start (c) Save
3. 3.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Done button: 40 px tall
   Start button: 64 px tall
   Send button: 48 px tall
4. 4.Which colour pair is easy to read? (a) red on green (b) black on yellow (c) pale pink on white (d) dark blue on black
5. 5.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
6. 6.🔘 Our rule: buttons are at least 48 px tall. The Start button is 28 px tall. How many px taller must it be?
7. 7.🔘 Our rule: buttons are at least 48 px tall. The Save button is 28 px tall. How many px taller must it be?
8. 8.True or false: buttons almost touching is poor button design. (a) False (b) True
9. 9.True or false: icons with no meaning is good button design. (a) False (b) True
10. 10.True or false: grey text on grey is poor button design. (a) False (b) True
11. 11.🌗 Is black on yellow easy or hard to read on a button? (a) hard to read (b) easy to read
12. 12.🔘 Our rule: buttons are at least 48 px tall. The Save button is 20 px tall. How many px taller must it be?
13. 13.🔘 Our rule: buttons are at least 48 px tall. The Back button is 44 px tall. How many px taller must it be?
14. 14.Which colour pair is hard to read? (a) dark blue on black (b) white on black (c) black on pale grey (d) white on dark green
15. 15.Which colour pair is hard to read? (a) white on dark green (b) dark blue on white (c) red on green (d) black on yellow
16. 16.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
17. 17.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 40 px tall
    Next button: 40 px tall
    Back button: 44 px tall
    Send button: 56 px tall
18. 18.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 72 px tall
    Save button: 48 px tall
    Done button: 44 px tall (a) Next (b) Done (c) Save
19. 19.🔘 Our rule: buttons are at least 48 px tall. The Back button is 28 px tall. How many px taller must it be?
20. 20.🔘 Our rule: buttons are at least 48 px tall. The Next button is 32 px tall. How many px taller must it be?
21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 72 px tall
    Next button: 56 px tall
    Send button: 36 px tall (a) Next (b) Cancel (c) Send
22. 22.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) white on black (d) dark blue on black
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 64 px tall
    Help button: 60 px tall
    Done button: 60 px tall
    Send button: 44 px tall (a) Back (b) Help (c) Done (d) Send
24. 24.Which colour pair is hard to read? (a) light grey on white (b) white on black (c) black on pale grey (d) white on dark green
25. 25.Which colour pair is hard to read? (a) dark blue on white (b) yellow on white (c) white on black (d) white on dark green
26. 26.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 32 px tall
    Back button: 48 px tall
    Start button: 32 px tall
    Send button: 52 px tall
27. 27.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
28. 28.True or false: a clear word like Save is poor button design. (a) False (b) True
29. 29.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 44 px tall
    Next button: 72 px tall
    Help button: 48 px tall
    Start button: 68 px tall (a) Help (b) Start (c) Next (d) Cancel
30. 30.🌗 Is black on pale grey easy or hard to read on a button? (a) easy to read (b) hard to read
31. 31.True or false: a big, easy tap area is poor button design. (a) False (b) True
32. 32.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
33. 33.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
34. 34.🔘 Our rule: buttons are at least 48 px tall. The Next button is 20 px tall. How many px taller must it be?
35. 35.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 44 px tall
    Send button: 48 px tall
    Done button: 60 px tall
    Save button: 48 px tall
36. 36.True or false: grey text on grey is good button design. (a) False (b) True
37. 37.Which colour pair is easy to read? (a) dark blue on black (b) red on green (c) light grey on white (d) black on pale grey
38. 38.🔘 Our rule: buttons are at least 48 px tall. The Next button is 36 px tall. How many px taller must it be?
39. 39.Which colour pair is easy to read? (a) dark blue on black (b) white on dark green (c) light grey on white (d) pale pink on white
40. 40.🔘 Our rule: buttons are at least 48 px tall. The Start button is 24 px tall. How many px taller must it be?

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