This answer shows how to use Google Keep as a standalone web app in the browser (Chrome/Chromium/Firefox).

Google Chrome/Chromium

Try it in the terminal

There is a command line -app= option you can try. Open a terminal and enter

google-chrome -app=https://keep.google.com

This will open the Keep web page without tabs, the address box, menu, toolbar, or the installed chrome extension icons.

It looks pretty much like a desktop Google Keep app. If you like this approach, follow the next steps.

Create a desktop launcher

Create a desktop launcher file in $HOME/.local/share/applications/ folder with the following text.

[Desktop Entry]
Version=1.0
Name=Google Keep
Exec=/usr/bin/google-chrome -app=https://keep.google.com
StartupNotify=true
Terminal=false
Icon=google-chrome
Type=Application

I have kept the Chrome icon above. You may want to change to something more suitable.

Name this file keep.desktop and save it.

Now you should have a searchable desktop app for Keep.

The GUI way using Chrome

1. Open https://keep.google.com in Google chrome
2. Click on the three vertical dot menu on the top right corner
3. Click on More Tools > Create Shortcut....
4. Check the box Open as Window and then the button Create.

That is pretty much it.

Hope this helps

Firefox

First, install Linux Mint Webapp Manager in Ubuntu.

wget http://packages.linuxmint.com/pool/main/w/webapp-manager/webapp-manager_1.2.8_all.deb
sudo apt install ./webapp-manager_1.2.8_all.deb

Now open Webapp Manager, and click on the add button.

Now, add information about Google Keep. (The icon is named chrome-google-keep in the Papirus Icon theme. In case you don't have this icon theme, you can manually download the icon from internet and add it)

Now, Google Keep should show up among your apps.

I have not found any official word from Google (I have my sources internally) that the Google Apps and/or the Chrome Store are being phased out (yet). So, for now the answer that was linked originally is still working fine as long as you do with with the Chrome (possibly Chromium but I don't have it installed) browser. The other answer here is great for the other steps like command line to do and also allowing you to create web apps with Firefox (which is pretty cool).

terrance@terrance-ubuntu:~$ cat /etc/*release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Ubuntu 22.04.1 LTS"
PRETTY_NAME="Ubuntu 22.04.1 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.1 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

terrance@terrance-ubuntu:~$ google-chrome --version
Google Chrome 108.0.5359.124 

1. Open https://chrome.google.com/webstore/detail/google-keep-notes-and-lis/hmjkmjkepdijhoojdojkdfohbdgmmhki/related?hl=en in Chrome to add Keep as a Chrome App to Chrome browser.

   

2. While in Chrome goto chrome://apps. Right-click on Keep and choose Create Shortcuts

   

3. Choose both Desktop and Applications Menu, if you want both.

   

4. Desktop and Applications Menu shortcuts should be created.

   

   

5. Enjoy Google Keep as a web app.