Simple Contacts works well.
this post was submitted on 28 Sep 2023
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I use DAVx⁵ to sync contacts and calendar, and just use the GrapheneOS contact app. It's been perfectly reliable with my FastMail account.
DavX syncs with your calendar provider. Any calendar app which uses your calendar provider will be able to your synced calendars
If you just want contacts, there are a bunch of free Nextcloud services.