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

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Aerion commented
Ideally Proton would achieve this by integrating an EteSync server. EteSync provide a ready to use, open source, and well established solution for adding end-to-end encryption: Etebase (https://www.etebase.com/).
It already works with Android, iOS, Windows, Linux, macOS, Thunderbird, Evolution, Kontact, Tasks.org, and any other CalDAV/CardDAV client.
I've been using it for a number of years already, and it's never failed, not once. It's the only sync solution I've ever used that's not had problems with duplicates or missing data.
Being able to use this with ProtonMail would be perfect.
Rather than reinventing the wheel by developing their own implmentation, which would take a long time to develop and test, Proton should implement an already existing solution that's specifically designed to achieve EE2E synchronization of PIM data.
By opting for Etebase they'd achieving not only the contacts synchronization people are begging for, but also that of calendar entries and tasks with one single solution.
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Edward commented
I have a Visionary account, but if there's one thing that tempts me to ditch it and go back to Google, it's the fact that I can't access a single list of contacts from both ProtonMail and iMessage. After two years, I have two messy contact lists.
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Vadim Slynko commented
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Dave commented
It would be great to be able to sync ProtonMail contacts and iOS/Android native contacts in the phone/tablet app.
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Gary Shull commented
MUST have my Apple Contacts app available on my iphone. Need to sync automatically with my protonmail contacts. Can't get completely away from gmail because my iphone contacts go away when I remove gmail from my apple id.
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[Deleted User] commented
Regarding privacy, a dedicated contacts app on Mobile and Desktop which provides the option (non-mandatory) to synchronize into system contacts would be ideal. It would allow those who value convenience and those who value absolute privacy to both be satisfied.
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Stanton Jeffers commented
If you have no plan to get Contacts Issues solved quickly we will assume it is dead and move our company business off Exchange to something else.
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Stanton Jeffers commented
Contacts stops me from moving my businesses to ProtonMail
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Aaron Aubrecht commented
As an equally secure (perhaps more secure?) solution, try this:
1. Host your contacts on your NAS (I use Synology's Contacts app)
2. Use a WebDAV app to sync to your mobile (I use Contact Sync on Android - paid), and
3. Use open source CalDavSynchronize to sync to your desktop Outlook client (if you use it)The UX is not perfect if you prefer ProtonMail's webmail or app on Android... but...
I wholeheartedly agree with the many other posters who have highlighted the pace of new feature delivery at ProtonMail is incredibly slow...The solution described above will provide a secure, reliable, and private solution TODAY.
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Ross commented
This is the one thing stopping a full migration to ProtonMail for me. Need my contacts synced between desktop and mobile.
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William Turner commented
Yes please! and specifically an android app for contacts.
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Anonymous commented
Integrating/syncing Proton contacts with existing Google contacts app would likely not provide any additional privacy than just using the Google app itself. Would prove more beneficial for standalone open-source Proton Contacts app that integrates with a privacy oriented phone calling app for those not using Google service, or looking to leave it behind. Same for iOS.
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HK commented
This goes all way back to 2015. It has been almost 7 years since ProtonTeam first commented on it.
4 years after in 2019 it was flagged as planned.
Now almost 3 years later, it still hasn't been implemented.
It's the 5th highest voted feature.
Come on ProtonTeam. Contacts is an important thing, not just as an in-mail widget. -
Millo commented
This feature is a game changer. Please add it asap.
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Rod Barnes commented
[From a paid user who just switched and is now thinking of going elsewhere...] The status of this says "Planned" as of Jan 10 2019. That is almost three years ago!! This is a critical requirement for this app to be viable. Requiring the user to maintain two contact lists is just not realistic and is driving against acceptance of Proton.
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cd4506 commented
I concur. As much as a LOVE ProtonMail and all Proton products, if a user completely migrates to ProtonMail, they will be unable to use Siri on iOS for phone calls. Name resolution will not work when for incoming calls, and more. I'm sure there is some technical reason (likely security concerns) about integrating natively into iOS and MacOS, however these are normal modern functions in today's world. We need them! Thanks.
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Brian Ference commented
And also change notifications to not use google services
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Anonymous commented
If you added a mobile Contact app, or at least the ability to sync-back-and-forth from ProtonMail, your user base would increase dramatically. Coming from a paid (Plus) user, considering (Professional), I can't pull the trigger yet. My wife would hate the contact non-mgmt.
Currently, all your users are the die-hard "privacy or death" users who can survive the inconvenience of contact non-mgmt. If you added a contact app, you would get the multitudes of "privacy preferred" users.
There's tons more of those privacy-preferred peeps out there who can't live without a contact app.
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Anonymous commented
A have already migrated all my mail from gmail to the ProtonMail, it is fine, but I can not do the same with my contacts from iOS/gmail - they sync. I would like the ProtonMail Contacts will be main the place where my addresses/phones are preserved. And when I can sync the ProtonMail Contacts with iOS contacts , I will remove all conntacts from my gmail/iOS.
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PE commented
that's a top priority indeed