Also think that some cooperation with Signal developers would be good. Considering similar philosophy about privacy, promoting each other and maybe giving each other some good ideas how to make their services even more secure and private could be beneficial.

However Proton team should focus on task at hand for now rather than start developing their own messaging app. Proton messaging app or Proton drive is good idea to keep in mind for the future but it's better to add new features slowly than make some bugs affecting security.

As others mentioned Signal already, it would just overlap, which is not very good - more apps, less people on one of each.

Proton mail is secure but it needs to be more attractive. A secure mail service with messenger, free call, storage for documents or collaboration, with ability to share photos and videos ,with a browser secure as well is a full package. Also take from gruveo , wherein you can chat on the webpage and call not necessarily an app. If you can embed the call and messenger without needto have an app on the page of the mail wow. that'd give you an edge. gruveo doesn't even require a caller to have an account or the app on the phone just an access to internet and it was featured on techcrunch.

I think that ProtonMail and Signal should just do some sort of two-way promoting, because they both have Edward Snowden's stamp of approval, and they both have similar philosophy about privacy.

Does ProtonMail operate/own http://protonxmpp.ch/?
Found via https://list.jabber.at/, wanted to confirm that it's being run by the same company.

Develop an app that encrypted can send sms and calls. Similar to the Signal app. Those who today use Protonmail will also be able to sms and call with encryption. The development of such that app will be a natural continuation of Protonmail.

Instead of making another chat app... You could dedicate some resources to improving Signal, which I think share a lot of your driving values.

P.S. If you still plan on making a chat app/service I put forth a name: Gluon.

Signal is a great app. Although it has the best security, its performance is not so great which I think is mostly due to financial constraints due to being free and open source.
If you want better performance WhatsApp implements Signal's e2e encryption and they have the Signal team's validation.

I agree that reinventing "secure and private chat" like everyone else is a very very bad thing to do.

Matrix is already shaping up to be absolutely wonderful -- it's feature-rich, its security and privacy is legitimate, it's open-source, and it's built around bridging to other chat networks, both open and closed.

A ProtonMail Matrix homeserver, with every ProtonMail user having an account, maybe even with a Matrix client built into ProtonMail, may be sensible, but even allocating those resources instead of just _using Matrix_ seems hard to justify.

Right now many android apps (BookMyShow, Freecharge in India & many other payment or wallet apps) mandatorily requires the SMS permission to be allowed for their function. Otherwise they crash or may not function properly. While doing bank transaction, when user receive OTP to verify the transaction these apps read that ORP directly and complete the payment without user confimation or little confirmation (as user have 3 secs to stop from auto confirming transactionl) I would like to see a SMS managing app from Protonmail which stores SMS in kind of encrypted way so that only human user can read those SMS amd not the these app or any other program. Such app for SMS will be more privacy friendly.

Rather than spreading the Proton team's focus between even more products, have you tried looking at Wire? (https://wire.com). It's an open source, end to end encrypted messenger app with high quality audio and video calls.

encrypted chat service

Wickr style chat function. Like Messenger and Gmail but with a self destruct option and Telegram style encryption.

Chat is an extremely saturated space, and I can't imagine any reason to implement yet-another insulated chat system.

If ProtonChat were to be a Proton owned and operated matrix (https://matrix.org) server, though, there'd be a solid foundation for chat with strong privacy (like e2e encrypted rooms), and it'd mean Proton is helping an open-source effort while helping itself.

That, and matrix also provides the potential to take chat right up to audio/video calls and a Google Hangouts type featureset.

Don't reinvent the wheel... Just provide an XMPP based service with OMEMO.

Hi, ProtonMail is a great service. Have you considered a messaging app too? ie an alternative to Whatsapp, Viber, Messenger etc which, like ProtonMail, respects an individual's privacy and has no connecting to the likes of Google and Facebook.

Oh god yes please!!

This would be totally awesome, if ever implemented. Sometimes it's easier to shoot a quick chat than email back and forth. Otherwise Protonmail is the shiiiiiznit!

Yes please, I came here to suggest this myself. Eventually a secure chat app like FB messenger would be super sweet. I don't like how telegram/signal/etc require you to give them your phone #

No need to merge Protonmail with a messenger application !
We only need a secure, quick and light email service. Not a big and slow service full of features we don't use.

Regarding the messengers applications, after trying several of them (telegram, whatsapp, etc.), in my opinion, Threema is the best in term of privacy, speed, reliability, and sound quality (call). AND it can be installed on a tablet (no phone number needed!). This is a winner feature!