A friend was asking, and it would be nice to have one or two to recommend.

Bonus if it’s on Google Play in addition to Fdroid, but not necessary.

Some recommendations in this thread:

• https://lemmy.ca/comment/12756204

Some discussion on apps (including non-FOSS) here:

• https://foundation.mozilla.org/en/privacynotincluded/categories/reproductive-health/