App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 655 · 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.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 40 px tall. How many px taller must it be?
2. 2.🔘 Is this good or poor button design: strong colour contrast? (a) good design (b) poor design
3. 3.🔘 Is this good or poor button design: icons with no meaning? (a) good design (b) poor design
4. 4.🔘 Our rule: buttons are at least 48 px tall. The Start button is 28 px tall. How many px taller must it be?
5. 5.🔘 Our rule: buttons are at least 48 px tall. The Back button is 44 px tall. How many px taller must it be?
6. 6.True or false: a big, easy tap area is good button design. (a) False (b) True
7. 7.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
   Save button: 48 px tall
   Start button: 56 px tall
   Next button: 48 px tall
   Cancel button: 60 px tall
8. 8.True or false: grey text on grey is poor button design. (a) False (b) True
9. 9.Which colour pair is easy to read? (a) dark blue on white (b) red on green (c) dark blue on black (d) yellow on white
10. 10.Which colour pair is easy to read? (a) red on green (b) dark blue on black (c) black on yellow (d) light grey on white
11. 11.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 24 px tall. How many px taller must it be?
12. 12.🔘 Is this good or poor button design: space between buttons? (a) good design (b) poor design
13. 13.🔘 Our rule: buttons are at least 48 px tall. The Save button is 40 px tall. How many px taller must it be?
14. 14.🔘 Is this good or poor button design: buttons almost touching? (a) good design (b) poor design
15. 15.🌗 Is black on pale grey easy or hard to read on a button? (a) hard to read (b) easy to read
16. 16.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Help button: 60 px tall
    Save button: 52 px tall
    Send button: 36 px tall (a) Help (b) Save (c) Send
17. 17.Which colour pair is hard to read? (a) black on yellow (b) white on dark green (c) black on pale grey (d) light grey on white
18. 18.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Done button: 32 px tall
    Save button: 48 px tall
    Cancel button: 64 px tall
    Next button: 32 px tall
19. 19.True or false: a tiny 20 px button is good button design. (a) False (b) True
20. 20.🌗 Is white on dark green easy or hard to read on a button? (a) hard to read (b) easy to read
21. 21.🔘 Our rule: buttons are at least 48 px tall. The Back button is 40 px tall. How many px taller must it be?
22. 22.🔘 Our rule: buttons are at least 48 px tall. The Cancel button is 36 px tall. How many px taller must it be?
23. 23.🔘 Our rule: buttons are at least 48 px tall. The Send button is 40 px tall. How many px taller must it be?
24. 24.🌗 Is pale pink on white easy or hard to read on a button? (a) easy to read (b) hard to read
25. 25.🌗 Is yellow on white easy or hard to read on a button? (a) hard to read (b) easy to read
26. 26.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Send button: 72 px tall
    Done button: 48 px tall
    Start button: 40 px tall (a) Start (b) Done (c) Send
27. 27.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Cancel button: 60 px tall
    Send button: 56 px tall
    Save button: 40 px tall (a) Send (b) Save (c) Cancel
28. 28.🔘 Our rule: buttons are at least 48 px tall. The Next button is 36 px tall. How many px taller must it be?
29. 29.True or false: buttons almost touching is good button design. (a) True (b) False
30. 30.🌗 Is dark blue on white easy or hard to read on a button? (a) hard to read (b) easy to read
31. 31.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Save button: 68 px tall
    Send button: 44 px tall
    Start button: 68 px tall
    Done button: 56 px tall (a) Done (b) Send (c) Start (d) Save
32. 32.🔘 Is this good or poor button design: grey text on grey? (a) poor design (b) good design
33. 33.🔘 Our rule: buttons are at least 48 px tall. The Save button is 32 px tall. How many px taller must it be?
34. 34.Which colour pair is hard to read? (a) white on dark green (b) yellow on white (c) dark blue on white (d) white on black
35. 35.🔘 Is this good or poor button design: a tiny 20 px button? (a) good design (b) poor design
36. 36.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 36 px tall
    Start button: 56 px tall
    Next button: 36 px tall
    Back button: 32 px tall
37. 37.🔘 Our rule: buttons are at least 48 px tall. Which button is too small?
    Done button: 60 px tall
    Help button: 24 px tall
    Back button: 56 px tall (a) Help (b) Back (c) Done
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.🔘 Our rule: buttons are at least 48 px tall. How many of these buttons follow the rule?
    Save button: 40 px tall
    Back button: 56 px tall
    Cancel button: 64 px tall
    Help button: 40 px tall
40. 40.True or false: a clear word like Save is good button design. (a) False (b) True

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