When comparing Paperback vs Turtl, the Slant community recommends Turtl for most people. In the question“What is the best cross-platform note taking app?” Turtl is ranked 13th while Paperback is ranked 59th. The most important reason people chose Turtl is:
After assigning a password to your account in Turtl, a key is created to encrypt the entire account. No data is stored on their servers meaning they have no access to unencrypted content. This is a huge leg up when comparing to other Evernote alternatives.
Specs
Question Ranking
Pros
Pro PIN protection
Secure your notebooks and notes with a secret PIN code.
Pro Photos, reminders and sub-notes
Easily take, organize and secure your notes in a beautifully designed user interface. Add photos, reminders and sub-notes with just a few taps.
Pro Easy to use
The user friendly interface makes using Paperback fast and efficient.
Pro Fast and efficient
Pro Good security
After assigning a password to your account in Turtl, a key is created to encrypt the entire account. No data is stored on their servers meaning they have no access to unencrypted content. This is a huge leg up when comparing to other Evernote alternatives.
Pro Multiple Platforms (Windows, Linux, macOS, Android, Firefox, Chrome)
Turtl has applications for all the major operating systems, as well as Android. In addition, there are extensions available for Firefox and Chrome that cooperate with the downloadable applications.
Pro Open source
The app is licensed under GPLv3 making it open source. This means that anyone can use the code and contribute. This also makes it easy to use on one's own server or for company solutions.
Cons
Con No image embedding
Instead of image embeddings, there's a sort of poor man's substitute: image + description. If you add an image, you can create a description of any size and with all the formatting features. It can be used instead of image embedding but much more limited: only one image and only at the very top.
Con No iOS app
While many other operating systems have a client, iOS does not have one yet (though it is planned).