App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 303 · 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 light grey on white easy or hard to read on a button? (a) easy to read (b) hard to read
2. 2.Which colour pair is easy to read? (a) dark blue on white (b) pale pink on white (c) dark blue on black (d) red on green
3. 3.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Done button: 68 px tall
   Next button: 56 px tall
   Cancel button: 24 px tall
   Send button: 72 px tall (a) Next (b) Send (c) Cancel (d) Done
4. 4.🌗 Is dark blue on black easy or hard to read on a button? (a) easy to read (b) hard to read
5. 5.🔘 Is this good or poor button design: space between buttons? (a) poor design (b) good design
6. 6.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
7. 7.Which colour pair is easy to read? (a) yellow on white (b) black on yellow (c) dark blue on black (d) light grey on white
8. 8.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Cancel button: 36 px tall
   Done button: 32 px tall
   Start button: 64 px tall
9. 9.🔘 Is this good or poor button design: buttons almost touching? (a) poor design (b) good design
10. 10.🔘 Is this good or poor button design: a big, easy tap area? (a) good design (b) poor design
11. 11.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Back button: 36 px tall
    Done button: 56 px tall
    Next button: 72 px tall (a) Back (b) Next (c) Done
12. 12.🔘 Our rule: buttons are at least 48 px tall. The Help button is 32 px tall. How many px taller must it be?
13. 13.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
14. 14.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
15. 15.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
16. 16.Which colour pair is hard to read? (a) black on yellow (b) light grey on white (c) white on dark green (d) dark blue on white
17. 17.🌗 Is black on yellow easy or hard to read on a button? (a) easy to read (b) hard to read
18. 18.Which colour pair is easy to read? (a) yellow on white (b) black on pale grey (c) pale pink on white (d) red on green
19. 19.🔘 Our rule: buttons are at least 48 px tall. The Send button is 28 px tall. How many px taller must it be?
20. 20.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 64 px tall
    Start button: 36 px tall
    Send button: 56 px tall
    Save button: 64 px tall
21. 21.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 36 px tall
    Next button: 68 px tall
    Save button: 64 px tall (a) Cancel (b) Save (c) Next
22. 22.🔘 Our rule: buttons are at least 48 px tall. The Done button is 40 px tall. How many px taller must it be?
23. 23.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 68 px tall
    Done button: 64 px tall
    Send button: 36 px tall (a) Done (b) Send (c) Cancel
24. 24.Which colour pair is hard to read? (a) dark blue on white (b) red on green (c) black on yellow (d) white on black
25. 25.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 32 px tall
    Send button: 60 px tall
    Save button: 60 px tall
    Next button: 40 px tall
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Send button is 32 px tall. How many px taller must it be?
27. 27.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
28. 28.True or false: strong colour contrast is good button design. (a) False (b) True
29. 29.True or false: a clear word like Save is poor button design. (a) True (b) False
30. 30.Which colour pair is hard to read? (a) black on pale grey (b) dark blue on black (c) white on black (d) white on dark green
31. 31.True or false: grey text on grey is poor button design. (a) True (b) False
32. 32.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Back button: 60 px tall
    Save button: 40 px tall
    Done button: 36 px tall
33. 33.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
34. 34.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 44 px tall
    Cancel button: 64 px tall
    Next button: 64 px tall
    Help button: 68 px tall (a) Next (b) Cancel (c) Help (d) Done
35. 35.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 72 px tall
    Save button: 40 px tall
    Done button: 68 px tall
    Back button: 48 px tall (a) Done (b) Save (c) Back (d) Next
36. 36.🔘 Our rule: buttons are at least 48 px tall. The Back button is 40 px tall. How many px taller must it be?
37. 37.True or false: a tiny 20 px button is good button design. (a) True (b) False
38. 38.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 36 px tall
    Next button: 44 px tall
    Send button: 60 px tall
    Done button: 36 px tall
39. 39.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Help button: 40 px tall
    Save button: 40 px tall
    Start button: 52 px tall
    Cancel button: 32 px tall
40. 40.True or false: grey text on grey is good button design. (a) False (b) True

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