Table 3.

Test scenarios: Predicted day of ovulation.

Scenario 1
APP/cycle length	9*28	32	32	32
Menstruationskalender Pro		15	18	19	19
Flo Menstruationskalender		14	14	14	15
Clue Menstruations- und Zykluskalender		15	15	15	16
Period Tracker Deluxe		15	16	18	19
Maya-Mein Periodentracker		14	14	14	14
WomanLog-Pro-Kalender		15	15	16	16
Scenario 2
App/cycle length	26	32	33	28	30	34
Menstruationskalender Pro	15	13	16	17	17	17	18
Flo Menstruationskalender	14	12	15	16	16	16	17
Clue Menstruations- und Zykluskalender	15	16	17	17	17	17	17
Period Tracker Deluxe	15	13	16	17	18	17	18
Maya-Mein Periodentracker	14	12	15	16	16	16	16
WomanLog-Pro-Kalender	15	13	16	17	17	17	18
Scenario 3
APP/cycle length	4*30	26	26
Menstruationskalender Pro		17	16	15
Flo Menstruationskalender		16	15	15
Clue Menstruations- und Zykluskalender		17	17	17
Period Tracker Deluxe		17	16	14
Maya-Mein Periodentracker		16	15	15
WomanLog-Pro-Kalender		17	16	16
Scenario 4
APP/cycle length	3*28	56	28	28
Menstruationskalender Pro		15	15	15	15
Flo Menstruationskalender		14	14	14	14
Clue Menstruations- und Zykluskalender		15	15	15	15
Period Tracker Deluxe		15	24	24	24
Maya-Mein Periodentracker		14	14	14	14
WomanLog-Pro-Kalender		15	15	15	15

Cycle length is indicated in bold. The predicted day of ovulation for the upcoming cycle is shown in the next column. For example, in scenario 1 after observing 9 consecutive 28 day cycles the apps predicted ovulation in cycle 10 to be on day 14 or 15 depending on the app. After entering cycle 10 (32 days long), the predicted day of ovulation ranged from day 14 to 18 depending on the app.