People should use & improve the stuff that already exists, no need to start a new project!!

https://en.wikipedia.org/wiki/Signal_(software)
https://en.wikipedia.org/wiki/Tox_(protocol)
https://en.wikipedia.org/wiki/Ricochet_(software)
https://en.wikipedia.org/wiki/Ring_(software)
https://en.wikipedia.org/wiki/Wire_(software)
https://about.riot.im/
https://en.wikipedia.org/wiki/Cryptocat
http://goldbug.sourceforge.net/
https://prism-break.org
http://flowingmail.com/
https://p2pfoundation.net/
http://secushare.org/

https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_protocols
https://en.wikipedia.org/wiki/Comparison_of_instant_messaging_clients#Secure_messengers

Wire is the way to go. Don't ever put your secure eggs in one basket.

i hate it when people request things that already exist. for proton drive use mega.nz or pcloud or trezorit. for proton messaging use signal or wire. for password management use dashlane or bitwarden for web browseing use firefox or tor / brave any other protony ideas? they exist

There's already Wire, which doesn't require your phone number and has open source clients.

Please make it interoperable with Signal Private Messenger, at launch.

Hangouts is a way on Gmail to send instant messages to each other or instant emails
if you will. Both people have to be in their Gmail at the same time to send and receive
the messages. If some one sends you a message using hangouts and your not in your
Gmail the message will still arrive but it will be in your hangouts dialog box. You can
send instant videos and pictures in hangouts also.

I own vibro-chat.com and vibrochat.club and want to implement a vibrational feedback *poke and custom parse text to cause a usb battery (usb cable soldered to AAA to AA battery adapter with resistor) to activate

I already can't get my contacts to use anything other than plain SMS. Another messaging option is not going to change that.

There are so many messaging app already, we should focus on emails and how to improve it with personalized tools.

Encrypted chat for Proton Mail users.

A simple, basic yet continuously improving and expanding, secure way to communicate with business partners and fellow employees through video chat, text messages, and emails; where large groups, small groups and sub-groups can be formed with various levels of access, in order to share ideas safely, and avoid corporate or country espionage.

There are so many messaging apps I don't think this would be very popular if Proton Messanger was a thing unlike secure email which ProtonMail is one of the few options out there.

If you want a good secure messaging app that is based on phone numbers use Signal. Its free, open source, and has all most of the features WhatsApp offers and a few more extra features like self destructing messages.

If you want a good secure messaging app that is based on accounts (Not email or phone number) use Wire. It Swiss made and is a lot like WhatsApp with messaging and video call. You can think of it as a secure version of Skype. To sign up you do need to give them a email or phone number but the other users you chat with will not see your email or phone number and they will only see your username and name but adding your name is optional. I recommend signing up on your desktop and not on mobile and sign up with your email so that way if you forget your password you can easily reset your password via email.

And there are so many other ones out there I can list but I have used many of them and these two I mentioned is what I used.

That's not a good idea, there are already many messaging apps encrypted end-to-end

We need protonchat now please.

I would like a chat feature within the email account. Also on the app if possible. That would be excellent

希望部要變成谷歌的後繼,因為我的android phone只允許PROTONMAIL,而完全脫離谷歌!

What are hangouts? I don't have Gmail

You should create a secure messaging app like Telegram but linked with our ProtonMail Account so that we can have a secure and fast exchange with our contacts. It would be encrypted in 4096 Bytes and we have to unlock it with our ProtonMail password or our fingerprints on the iOS / Android app. The users would be able to set their router as an exchange server for the app (like the Tor Network) with a system of bridges. Finally, the app would be free but the users can Donate via a dedicated Bitcoin Adress or a Paypal email.

Feature creep. Let's focus on EMAIL.

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 soI'mme bugs affecting security.