A device receives a user input that corresponds with a sequence of characters. In response to the user input, the device displays simulated handwritten text that includes varying the appearance of characters in the simulated handwritten text based on variations in handwritten text of a respective user. In response to receiving the user input and in accordance with a determination that a first criterion is met, a first character in the sequence of characters has a first appearance that corresponds to the appearance of the first character in handwritten text of the respective user. In accordance with a determination that a second criterion is met, the first character in the sequence of characters has a second appearance that corresponds to the appearance of the first character in handwritten text of the respective user. The second appearance of the first character is different than the first appearance of the first character.