are you planning to make app for windows 10(universal app)

Buy an HTTPS certificate and implant in on the website so data is encrypted between the server and the user. This would make Kopy more secure.

On click the Kopy Icon of the Chrome Extension near the address bar
a list will drop down of the Kopy'ed text.
This will work great as one can dose not need to login to the website rather use the already logged in Chrome Extension to send and RECEIVE text.
Just like the windows phone client.

I know its already planned, but still.

copy QR-code contens and paste contens into Kopy. Phone has camera for reading but webcam in pc a bit complicated.

It would be great if the Windows 8.1 version of the app also had push notifications. Also the push notifications on Windows Phone app doesn't work sometimes. Fix that too.

I have iOS tablet, WP8.1 phone, and Linux computer. Phone and computer done. For my tablet, ios app would be nice.

I want to have all my note in my device offline or when we lose my connection network...

Donate button! :P

What about scanning and koby text or link from any screen or wall or anything like this...
such as koby a link directly from wepsite on my computer to my phone by the camera!!

One Drive intigration.

Automatically send link or text to a designated Onenote notebook

Windows Desktop App with context menu integration.

It'll be really nice if we can copy contacts list information between two device by NFC

Let us choose font size on esp. on mobile Devices, I hardly can read the text on my phone.

Create a Kopy extension for Firefox

Fix Chrome toolbar button to actually launch Kopy when I click on it.

Encrypted data transmission!
Text is send out without encryption. With Wireshark its possible to read all Messages at network layer.
At least HTTPS should be standard for login pages.