When comparing Copy 2 Online vs Klipper, the Slant community recommends Klipper for most people. In the question“What are the best clipboard managers for UNIX-like systems?” Klipper is ranked 3rd while Copy 2 Online is ranked 11th. The most important reason people chose Klipper is:
It's a part of Plasma 5 which is one of the best Linux desktop environments currently, so it has complete integration and is already included with the basic packages.
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Pros
Pro Free/Trial account
You can use this application during 7-days as a free user.
Pro Speed
Strong searching ability and fetch data.
Pro User-Friendly
Pro Online
Cloud based then access from any devices.
Pro Search Window by pressing Alt+Space
Really user-friendly.
Pro Free usage
Free accounts can open multiple session and share the data between devices. For the paid users, there are many ability while managing copy history and opening the much more sessions.
Pro Promo-Code Section
Nowadays, they have promo-code to have discount. Promo-code is "C2O100".
Pro Comes already integrated with the one of the best Linux desktop environments
It's a part of Plasma 5 which is one of the best Linux desktop environments currently, so it has complete integration and is already included with the basic packages.
Pro Can be configured to work as you like
Length of the history, persistence between sessions, what to do with trailing white spaces, basically whatever you could wish to change is configurable.
Pro Pre-configured button to create a QR code out of any clips
If you're not already using KDE Connect to exchange clipboard entries with your mobile devices, this one is a lifesaver. It's also handy when someone else needs to copy one of your clips.
Pro Integrated support for MIME-based Actions
And you can configure any other actions with regexps based on content
Cons
Con Freemium
Free version is limited to :
Copy 100 characters at once
See last 10 copy history
Up to 2 sessions
Con Since it's part of Plasma it might not be the best choice for other DEs/WMs
No complete integration, will pull in a lot of Plasma dependencies....