Sync contacts with phone address book
Sync the Protonmail contacts with the phone address book (contacts app) and vice versa.

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SodaPhish commented
any bleed-over to less secure platforms is how you erode the security of PM.
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Andrew commented
Gave 3 votes to this idea, which would almost complete the removal of dependency on Google (the final step is a calendaring solution).
For reference: Posteo already supports this (via CardDAV), as well as Calendar data too (CalDAV).
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Rich commented
This. When it's comes to protecting privacy we often focus on the messages and ignore something as simple as our contacts list. It would be fantastic if ProtonMail could not only provide me access to my email on all my devices, but my contacts too. I would rather pay ProtonMail to sync my contacts between my Android Phone, Tablet and laptop than use other providers who wish to exploit my information.
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Anonymous commented
client AND server would be most beneficial, allowing contacts to be either managed within protonmail or by a third service (owncloud/nextcloud, icloud, etc)
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J commented
This can be done already. For instance, if you have gmail, you can go to https://contacts.google.com/
From there you can export an outlook contacts file. Then, ProtonMail has an option to import such a file. This is better than connecting to your account because it is more anonymous this way. -
Elfego commented
Please add the ability to sync with mobile contacts on mobile devices. This way we can use ProtonMail as our primary place to store and sync contacts with phone numbers as well as email address.
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KFH commented
Yes, please add this feature! I would like to move all my stuff from Gmail to ProtonMail!
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Anonymous commented
Please add this :-)
Having access to cardDAV (and calDAV) are my practical show-stoppers from switching to ProtonMail. I use google to manage my contacts, and then use cardDAV on all my devices. I live in two countries, and have two phones, multiple other devices, and I need some way of syncing all my contacts....
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Remi Ferrand commented
Would be perfect for Owncloud or Synology NAS completion.
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Leandro Loureiro commented
Good sugestion, will be a very good enhancement.
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ilkovic commented
Please add support for CardDAV and CalDAV (add calendar feature)
Then would be much easier for people to migrate from gmail...
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Anonymous commented
Want to sync my contacts \o/ (owncloud)
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NR commented
Contact synchronization for all apple device.
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Arno Muhren commented
It would be nice if protonmail could both act as a server and a client. That way, when you already have a carddav server running elsewhere, you can sync protonmail contacts based on that.
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AdminProton (Admin, Proton) commented
Carddav Server For Contacts (Synching Contacts)