App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 250 · 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 yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
2. 2.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Send button: 64 px tall
   Save button: 60 px tall
   Start button: 36 px tall
   Done button: 36 px tall
3. 3.True or false: strong colour contrast is poor button design. (a) True (b) False
4. 4.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Help button: 24 px tall
   Save button: 48 px tall
   Send button: 64 px tall (a) Help (b) Send (c) Save
5. 5.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Help button: 56 px tall
   Send button: 52 px tall
   Back button: 32 px tall
6. 6.🌗 Is white on black easy or hard to read on a button? (a) easy to read (b) hard to read
7. 7.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 40 px tall
   Start button: 48 px tall
   Next button: 52 px tall
   Help button: 64 px tall (a) Start (b) Help (c) Cancel (d) Next
8. 8.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
   Cancel button: 72 px tall
   Next button: 24 px tall
   Help button: 52 px tall
   Send button: 60 px tall (a) Cancel (b) Help (c) Next (d) Send
9. 9.Which colour pair is hard to read? (a) black on pale grey (b) red on green (c) white on black (d) dark blue on white
10. 10.🔘 Is this good or poor button design: a tiny 20 px button? (a) poor design (b) good design
11. 11.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Next button: 32 px tall
    Send button: 36 px tall
    Cancel button: 60 px tall
    Back button: 48 px tall
12. 12.True or false: a big, easy tap area is good button design. (a) True (b) False
13. 13.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 20 px tall. How many px taller must it be?
14. 14.🔘 Is this good or poor button design: icons with no meaning? (a) poor design (b) good design
15. 15.🔘 Our rule: buttons are at least 48 px tall. The Next button is 36 px tall. How many px taller must it be?
16. 16.True or false: buttons almost touching is good button design. (a) False (b) True
17. 17.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) black on yellow (d) red on green
18. 18.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Send button: 64 px tall
    Back button: 36 px tall
    Done button: 44 px tall
    Start button: 52 px tall
19. 19.🔘 Our rule: buttons are at least 48 px tall. The Save button is 36 px tall. How many px taller must it be?
20. 20.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
21. 21.True or false: grey text on grey is good button design. (a) True (b) False
22. 22.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 72 px tall
    Back button: 52 px tall
    Next button: 24 px tall (a) Next (b) Done (c) Back
23. 23.Which colour pair is easy to read? (a) red on green (b) dark blue on white (c) dark blue on black (d) yellow on white
24. 24.🌗 Is light grey on white easy or hard to read on a button? (a) hard to read (b) easy to read
25. 25.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 28 px tall
    Help button: 56 px tall
    Next button: 60 px tall (a) Next (b) Save (c) Help
26. 26.🔘 Our rule: buttons are at least 48 px tall. The Next button is 32 px tall. How many px taller must it be?
27. 27.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
28. 28.🌗 Is red on green easy or hard to read on a button? (a) hard to read (b) easy to read
29. 29.🔘 Our rule: buttons are at least 48 px tall. The Start button is 28 px tall. How many px taller must it be?
30. 30.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) black on pale grey (d) pale pink on white
31. 31.Which colour pair is hard to read? (a) black on pale grey (b) yellow on white (c) dark blue on white (d) black on yellow
32. 32.Which colour pair is easy to read? (a) yellow on white (b) light grey on white (c) white on dark green (d) red on green
33. 33.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 68 px tall
    Start button: 44 px tall
    Save button: 60 px tall (a) Save (b) Start (c) Done
34. 34.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
35. 35.True or false: strong colour contrast is good button design. (a) False (b) True
36. 36.🌗 Is dark blue on white easy or hard to read on a button? (a) easy to read (b) hard to read
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Next button: 52 px tall
    Cancel button: 64 px tall
    Done button: 36 px tall (a) Next (b) Done (c) Cancel
38. 38.🔘 Our rule: buttons are at least 48 px tall. The Next button is 40 px tall. How many px taller must it be?
39. 39.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
40. 40.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Start button: 52 px tall
    Done button: 40 px tall
    Cancel button: 52 px tall

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