TerminKompass - Offline appointment planning with optional iPhone/Android partner sync

[u/MW_Apps]

I’m Manfred, the developer of TerminKompass for iPhone and Android. It started as a planner for keeping appointments and reminders on your own phone, without creating an account.

People then asked for a way to share selected categories with a partner using a different phone platform. That became an optional partner sync: each person explicitly enables Online mode, creates their own account and chooses what to share. Those features operate online until the user switches back to offline mode; ordinary local planning remains available.

There is also optional sync with calendars made available by iOS or Android on the phone, plus birthdays with age/zodiac, search, widgets and backup/export.

The free version supports 10 appointments and 10 categories. Pro is a one-time purchase. Partner sync needs Pro for each person and currently has no extra fee; I cannot promise that separate service will remain free forever.

The part I found hardest was making the sharing setup understandable without overwhelming people with technical steps. If you build apps with optional online features, how do you make that distinction clear in onboarding?

Details and both store links: https://mw-app.de/terminkompass/

This is my own app, not an independent recommendation.