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App Dev Worksheet: Button Size and Contrast

App development lesson 12: Buttons: size and contrast · Set 101 · 40 questions
TalentJR

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.

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

Answer key

  1. black on pale grey
  2. 2
  3. True
  4. easy to read
  5. dark blue on white
  6. dark blue on black
  7. False
  8. good design
  9. good design
  10. easy to read
  11. Help
  12. Save
  13. False
  14. False
  15. white on dark green
  16. poor design
  17. poor design
  18. easy to read
  19. hard to read
  20. Back
  21. good design
  22. easy to read
  23. Cancel
  24. 28
  25. 3
  26. good design
  27. Send
  28. Cancel
  29. 8
  30. True
  31. white on black
  32. 8
  33. Save
  34. Cancel
  35. 2
  36. 2
  37. 2
  38. 1
  39. False
  40. 0

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