Use gender-neutral pronouns

Society and language norms are constantly evolving. What was considered appropriate some 20 years ago may be unacceptable now. Inclusive design includes using gender-neutral pronouns. Generic masculine pronouns or awkward abbreviations like (s)he or s/he are steadily disappearing. To make users of all genders feel welcome, use gender-neutral pronouns like they/them and gender-neutral terms like "humankind" instead of "mankind."^[1]

However, addressing users as he/him and she/her is perfectly fine if you let them specify their pronouns in the app.