Sync contacts, calendars, and notes with native mobile apps
To sync with your cell phone and email - iphone calendar, contacts, and notes.

ProtonMail offers encrypted contacts for both web and mobile applications (https://protonmail.com/blog/encrypted-contacts-manager/). Calendar and note functionality will be released in the future.
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Stephen Kiel commented
There is a product - Nuvolect SecureSuite that is an encrypted alternative to the "contacts" on your phone. From the SecureSuite you can send mail through protonmail on your phone, and you can send mail TO A GROUP through protonmail on your phone. The nice thing about a dedicated contact manager is that it also can be used to place calls and send messages through 'Signal' or your default SMS. It provides an alternative to having your contacts available for all of your apps to see.
It does have a calendar, but in the current version it is a little lame. I am not seeing notifications from events, but it could be a setup issue. -
JohnyD commented
CardDAV is a must! encrypted contacts? come on ... that is to much, add the option: you want contacts sync with your iPhone, than no encryption, but add the option!
Also calendar would be nice to close the gap and have everything gmail has as basic and free. -
Anonymous commented
If you sync with your phone then you open up for Google to certainly invade your privacy. After all Android is their baby. Everyone will need an Iphone in order to remain safe.
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Loren commented
Love it....
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tboy commented
It would be great to sync contact with nextcloud/owncloud/etc using cardav.
syncing calendars with caldav could be useful as well -
Ludo Feyen commented
Should be very useful!
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Fa5t commented
I wanna live free from those American tech giants that sell my data to third parties.
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Tim commented
If you did this, I would put all of my energy into forking android and releasing a "security hardened" Android handset built for protonmail users, removing all Google core services. Either that or come work for protonmail to forge a copperhead os partnership... ; )
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Anonymous commented
A simple text note sync tool (like SimpleNote) with a basic note gui on mobile/desktop (ResophNotes, Notational Velocity) would be great.
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Anonymous commented
This is the frature I want the most, If I could have used all 7 votes on it I would have.
I have a sense of peace knowing my data is both private and secure (not that there's anything of great interest to anyone in my email - other than identity data and maybe some financial details). I turned to Protonmail because I lost FAITH in US based companies like Google to store my data privately. My data belongs to me, not a Government, nor is it up for sale to advertisers.
I would love to get rid of Google altogether, and the dependence on iCloud calendar, contacts, and notes.
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Anonymous commented
Some kind of webdav contact sync to my nextcloud instance would be nice.
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Anonymous commented
Help me dump Google - please add the calendar!
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Anonymous commented
Yes please to contacts, calendar, and notes!!!!
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Matthew Fitzpatrick commented
Calendar much needed!
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Anonymous commented
Agreed with all of the other comments - once this is implemented I will be rid of Google permanently (minus G-Voice). But I am seriously looking forward to this feature if it is implemented. It would really make Protonmail a secure, convenient, and easy to use Google replacement. And one that I can easy recommend to less tech-savvy family members!
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Gadi Ben-Yehuda commented
Like others, I cannot fully move away from GMail until ProtonMail has an integrated calendar, with an associated (Android) app. I'm a premium user of ProtonMail, and I encourage all my clients to use secure messaging services; it would be easier to ditch GMail completely if ProtonMail replaced all its core functions (Mail, Calendar, and SMS/MMS). Thanks!
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Anonymous commented
Mail service with no calendar is like a one-ball man.
We really need it!
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Anonymous commented
would be nice - or a seperate calendar and note
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Anonymous commented
Yes encrypted Caldav would be a dream!
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Josh commented
Agreed with most on this list. I cannot fully move away from Google or Hotmail until Calendar is put into place. Thank you!