WHO Contraception tool
O2BDigital
Who Win
HONE
Contraception Eligibility tool
Contraception
Centers for Disease Control and Prevention
Joshua Steinberg MD
Menstruations-Kalender, Zyklus
Simple Design Ltd.
Natural Cycles - Birth Control
NaturalCycles AG
Clue Perioden Kalender
Clue Period Tracker by BioWink
Lady Pill Reminder
Baviux